{ "dataset": "US home sauna and chiller-less cold plunge running cost, by state", "publisher": "BankrollZen (bankrollzen.com)", "version": "1.0", "built": "2026-07-27", "licence": "Free to reuse with attribution and a link to https://bankrollzen.com/ \u2014 please cite the version and build date.", "what_this_is": "A transparent model built on published public data. Every input is either a cited published figure or a declared assumption.", "what_this_is_not": "Measurements. Nothing here was metered. No sauna or plunge was instrumented to produce these numbers, and no figure should be described as a test result. The chiller-less plunge figures are NOT the cost of running a chilled plunge \u2014 no chiller is modelled. The headline sauna-vs-plunge comparison (about $207 against about $859 a year at US average prices, a ratio of 4.16x) also rests on TWO DIFFERENT USAGE BASES: 130 sauna sessions/year (2.5/week) against 52 plunge fills/year (1/week). And the plunge side charges ice once per fresh fill only \u2014 no top-up ice, no re-icing of a tub that has warmed back toward ambient. Both of those understate the plunge's cost, so 4.16x is a floor on the gap, not a ceiling.", "coverage": "50 states + District of Columbia", "sources": { "eia_epm_5_06_b": { "publisher": "U.S. Energy Information Administration", "dataset": "Electric Power Monthly, Table 5.6.B \u2014 Average Price of Electricity to Ultimate Customers by End-Use Sector, by State, Year-to-Date through May 2026 and 2025 (Cents per Kilowatthour)", "collection_form": "Form EIA-861M (formerly EIA-826), Monthly Electric Power Industry Report", "data_period": "Year-to-date January-May 2026", "release_date": "2026-07-23", "url": "https://www.eia.gov/electricity/monthly/xls/table_5_06_b.xlsx", "retrieved": "2026-07-27", "local_file": "sources/eia_table_5_06_b.xlsx", "note": "EIA labels these values preliminary estimates based on a cutoff model sample." }, "eia_epm_5_06_a": { "publisher": "U.S. Energy Information Administration", "dataset": "Electric Power Monthly, Table 5.6.A \u2014 Average Price of Electricity to Ultimate Customers by End-Use Sector, by State, May 2026 and 2025 (Cents per Kilowatthour)", "collection_form": "Form EIA-861M (formerly EIA-826), Monthly Electric Power Industry Report", "data_period": "May 2026 (single month)", "release_date": "2026-07-23", "url": "https://www.eia.gov/electricity/monthly/xls/table_5_06_a.xlsx", "retrieved": "2026-07-27", "local_file": "sources/eia_table_5_06_a.xlsx", "note": "EIA labels these values preliminary estimates based on a cutoff model sample." }, "epa_watersense": { "publisher": "U.S. Environmental Protection Agency, WaterSense", "dataset": "Data and Information Used by WaterSense \u2014 'Cost of Water' and 'Savings from Avoided Water Heating' tables", "data_period": "2024 estimates (page last updated 2026-02-18)", "url": "https://www.epa.gov/watersense/data-and-information-used-watersense", "retrieved": "2026-07-27", "figures_used": { "residential_water_usd_per_1000gal": 7.74, "residential_wastewater_usd_per_1000gal": 9.09, "residential_combined_usd_per_1000gal": 16.83, "weighted_national_average_inlet_water_temp_f": 61.5 }, "note": "WaterSense derives the rate estimates from American Water Works Association rate surveys, adjusted between survey years with the BEA GDP deflator for water." }, "noaa_ncei_climdiv": { "publisher": "NOAA National Centers for Environmental Information", "dataset": "nClimDiv statewide average temperature, file climdiv-tmpcst-v1.0.0-20260707 (element 02, statewide series). This is the bulk dataset underlying NOAA's Climate at a Glance statewide time series.", "data_period": "1991-2020 (30 annual values per state, averaged by this script)", "url": "https://www.ncei.noaa.gov/pub/data/cirs/climdiv/climdiv-tmpcst-v1.0.0-20260707", "retrieved": "2026-07-27", "local_file": "sources/climdiv-tmpcst-v1.0.0-20260707.txt (state annual means extracted to sources/noaa_state_tavg_1991_2020.json)", "validation": "Cross-checked against NOAA's Climate at a Glance statewide time series for Alabama (1991: 64.0, 1992: 62.1), California (2019: 58.4, 2020: 60.5), Alaska (2019: 32.2, 2020: 27.5) and Hawaii (2019: 67.6, 2020: 67.3). All matched exactly, which is also how the state codes 049=Hawaii and 050=Alaska were confirmed rather than assumed.", "note": "Used ONLY as a relative geographic signal, offset against a national anchor. It is air temperature, not water temperature. See ASSUMPTIONS.tap_water_temp." }, "census_pop": { "publisher": "U.S. Census Bureau, Population Division", "dataset": "Annual Estimates of the Resident Population for the United States, Regions, States, District of Columbia and Puerto Rico (NST-EST2024-ALLDATA), Vintage 2024", "data_period": "POPESTIMATE2024 (1 July 2024)", "url": "https://www2.census.gov/programs-surveys/popest/datasets/2020-2024/state/totals/NST-EST2024-ALLDATA.csv", "retrieved": "2026-07-27", "local_file": "sources/NST-EST2024-ALLDATA.csv", "note": "Used only to population-weight the national air-temperature anchor so it is consistent with EPA's population-weighted national inlet water temperature." }, "saunatimes_duty_cycle": { "publisher": "SaunaTimes (Glenn Auerbach)", "dataset": "'Sizing an electric sauna heater? Here's why 9kW could be your max'", "published": "2022-02-16 (modified 2024-10-02)", "url": "https://www.saunatimes.com/types-of-saunas/electric-saunas/sizing-an-electric-sauna-heater-heres-why-9kw-is-your-max-2/", "retrieved": "2026-07-27", "quote_used": "\"an electric sauna heated sauna performs best when the stove is 'on' no more than 30% of the time\" \u2014 and in the comment thread, \"we want our heater to cycle on/off about 30% of the time\".", "note": "This is a correctly-sized-heater design target from a named sauna-industry publisher, not a measurement of any specific sauna. It is the basis for the 30% maintenance duty-cycle assumption. The same author notes outdoor hot rooms lose more heat than the indoor case these figures assume, which is why the high scenario raises the duty cycle to 45%." }, "heatup_time_range": { "publisher": "Multiple named retailer/publisher listings (range, not a single figure)", "data_period": "Retrieved 2026-07-27", "points": [ { "source": "Sauna Place, 9kW sauna heaters category page", "url": "https://www.saunaplace.com/collections/9-kw-sauna-heaters", "claim": "\"Guaranteed to deliver 175F in under 45 minutes\"" }, { "source": "SaunaTimes comment thread (author Glenn Auerbach on a 9kW Homecraft Revive)", "url": "https://www.saunatimes.com/types-of-saunas/electric-saunas/sizing-an-electric-sauna-heater-heres-why-9kw-is-your-max-2/", "claim": "\"we can get up to serving temp within 45 mins. to an hour\"" }, { "source": "SaunaTimes comment thread (reader, high-thermal-mass heater)", "url": "https://www.saunatimes.com/types-of-saunas/electric-saunas/sizing-an-electric-sauna-heater-heres-why-9kw-is-your-max-2/", "claim": "\"60-80 minutes for it to come up to temp\" with 200 lb of stones" } ], "note": "Vendor marketing claims and one publisher's hands-on note, not controlled tests. The published claims above span 45 to 80 minutes, not 30 to 60. The 30/45/60-minute range driving the low/central/high scenarios is OUR reading of them, not a figure any source states: 30 minutes is an interpretation of \"Guaranteed to deliver 175F in under 45 minutes\" (no source states 30), and 60 minutes is a practical ceiling for a standard 9 kW barrel rather than the top of the published range \u2014 a high-stone-mass heater at 60-80 minutes may exceed our high scenario." }, "bagged_ice_price": { "publisher": "US retail listings observed via web search", "data_period": "Observed 2026-07-27", "observed_range_usd_per_20lb_bag": [ 2.29, 5.79 ], "note": "There is NO published national price index for bagged ice. Observed listings on 27 Jul 2026 spanned roughly $2.29 (warehouse club, reported) to $5.79 (home-improvement retail). This is the least reliable input in the dataset and is therefore exposed as a model parameter with a published sensitivity table rather than baked into a single headline number." }, "physical_constants": { "publisher": "Standard physical constants", "values": { "specific_heat_capacity_water_kJ_per_kg_K": 4.186, "latent_heat_of_fusion_ice_kJ_per_kg": 334, "litres_per_us_gallon": 3.785411784, "kg_per_lb": 0.45359237 }, "note": "Water density taken as 1.000 kg/L over the 0-25 C range modelled. The true value varies by under 0.3% across that range; the effect on every output here is smaller than the rounding." } }, "assumptions": { "sauna_kit": { "value": "8ft Canadian cedar barrel sauna, outdoor, 9 kW electric heater", "basis": "This is the sauna BankrollZen's owner actually has and uses, two to three times a week. The KIT is real. The electricity consumption below is MODELLED from that kit's stated rating \u2014 it has never been metered and no figure in this dataset is a measurement of it." }, "heater_kw": { "value": 9.0, "unit": "kW", "basis": "Nameplate rating of the installed heater." }, "heat_up_hours": { "low": 0.5, "central": 0.75, "high": 1.0, "unit": "hours", "basis": "30/45/60 minutes. Bounded by the published 9 kW heat-up claims in SOURCES.heatup_time_range. Heater assumed at 100% draw throughout heat-up." }, "session_hours": { "value": 0.75, "unit": "hours", "basis": "A 45-minute session at temperature. Held constant across all three scenarios. The scenarios vary THREE inputs: two that are genuinely uncertain (heat_up_hours and maintenance_duty_cycle) and one that is a usage choice (sessions_per_week). The full published $122.89-$340.08 annual band therefore spans both technical uncertainty and usage intensity. Citers who want the band attributable to technical uncertainty alone \u2014 sessions held at the central 2.5/week, US average price \u2014 should use $153.62-$283.40." }, "maintenance_duty_cycle": { "low": 0.3, "central": 0.3, "high": 0.45, "basis": "30% is the correctly-sized-heater design target published by SaunaTimes (SOURCES.saunatimes_duty_cycle). The high scenario raises it to 45% to represent an uninsulated outdoor barrel in cold weather, which the same source describes qualitatively but does not quantify. The 45% figure is OUR assumption, not theirs." }, "sessions_per_week": { "low": 2, "central": 2.5, "high": 3, "basis": "The owner's real usage pattern is two to three sessions a week. 2.5 is the midpoint of that stated range." }, "weeks_per_year": { "value": 52 }, "plunge_volume_gallons": { "value": 100, "unit": "US gallons", "basis": "A stated round figure in the normal range for a backyard stock-tank / plunge tub. Ice and water costs scale linearly with volume, so any reader can rescale: multiply by (their gallons / 100)." }, "plunge_target_temp_f": { "value": 50.0, "unit": "F", "basis": "A commonly-used cold-plunge target. Stated, not prescribed. The published formula lets any target be substituted." }, "plunge_has_chiller": { "value": false, "basis": "This models a CHILLER-LESS plunge \u2014 an ice bath. Its electricity cost is therefore zero by construction, and this dataset publishes NO chiller figure because we do not have a sourced one. Do not read these numbers as the cost of running a chilled plunge; they are not." }, "plunge_fills_per_year": { "value": 52, "basis": "One fresh fill per week \u2014 52 fills/year. Stated. Real refresh cadence varies with filtration, ozone and use. The model charges ice ONCE per fresh fill and nothing more: it does NOT model top-up ice between fills, nor the cost of re-icing an outdoor tub that has warmed back toward ambient between sessions. Anyone plunging more than once on a fill, or re-icing a warmed tub, will spend more than this model shows." }, "ice_enters_at_0c": { "value": true, "basis": "Bagged ice is modelled as entering the tub at exactly 0 C. Freezer ice is usually colder, which would make it slightly more effective per pound, so this assumption is conservative \u2014 it slightly OVERSTATES the ice needed." }, "ice_price_usd_per_20lb_bag": { "central": 5.0, "sensitivity": [ 3.0, 4.0, 5.0, 6.0 ], "basis": "No national index exists (SOURCES.bagged_ice_price). $5.00/bag ($0.25/lb) is a stated central within the observed retail range. The sensitivity table is published precisely because this input is weak." }, "tap_water_temp": { "national_anchor_f": 61.5, "basis": "EPA WaterSense publishes a weighted national average inlet water temperature of 61.5 F. Per-state tap temperature is NOT published anywhere we could find. We estimate it as: 61.5 F + (state annual mean AIR temperature - the population-weighted national annual mean AIR temperature), using NOAA 1991-2020 statewide normals and Census 2024 state populations.", "assumption_being_made": "That a 1 F difference in annual mean air temperature corresponds to a 1 F difference in annual mean mains water temperature. Anchoring on EPA's national figure removes any constant offset between ground/mains and air temperature; what remains is a SLOPE assumption of 1.0, which is ours and is unverified.", "known_limitation": "Real mains temperature is damped relative to air temperature and depends on source (surface vs well), pipe depth and season. These are ANNUAL MEAN figures: summer ice cost runs above them and winter below, and in the coldest states winter tap water can arrive at or under the 50 F target, making ice cost zero for part of the year. The tap-temperature sensitivity table is published so no reader has to rely on our per-state estimate at all." }, "dc_air_temperature": { "value": "Maryland", "basis": "NOAA's statewide series has no District of Columbia record. DC uses Maryland's statewide annual mean air temperature. DC's ELECTRICITY price is its own real EIA figure; only the air-temperature input is proxied." } }, "model": { "sauna_kwh_per_session": "heater_kW * heat_up_hours + heater_kW * session_hours * duty_cycle", "sauna_cost": "kWh * (state residential price in cents/kWh / 100)", "plunge_ice_mass": "m_ice = m_water * cp * (T_tap - T_target) / (Lf + cp * T_target) [Celsius; ice entering at 0 C; m_water = gallons * 3.785411784 kg]", "plunge_water_cost": "gallons / 1000 * combined water+wastewater USD per 1000 gallons", "plunge_electricity": "zero by construction \u2014 this is a chiller-less ice bath" }, "national_reference": { "residential_price_cents_kwh_ytd_2026": 18.11, "source": "EIA EPM Table 5.6.B, U.S. Total row", "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_central": 1.59, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_year_usd_low": 122.89, "sauna_cost_per_year_usd_central": 206.59, "sauna_cost_per_year_usd_high": 340.08, "plunge_tap_water_temp_f": 61.5, "plunge_tap_temp_source": "EPA WaterSense weighted national average inlet water temperature", "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 59.4, "plunge_ice_cost_per_fill_usd": 14.85, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 16.53, "plunge_cost_per_year_usd": 859.47 }, "national_population_weighted_mean_air_temp_f": 56.02, "sauna_scenarios": [ { "scenario": "low", "heat_up_minutes": 30, "session_minutes": 45, "maintenance_duty_cycle": 0.3, "sessions_per_week": 2, "kwh_per_session": 6.525, "kwh_per_year": 678.6 }, { "scenario": "central", "heat_up_minutes": 45, "session_minutes": 45, "maintenance_duty_cycle": 0.3, "sessions_per_week": 2.5, "kwh_per_session": 8.775, "kwh_per_year": 1140.8 }, { "scenario": "high", "heat_up_minutes": 60, "session_minutes": 45, "maintenance_duty_cycle": 0.45, "sessions_per_week": 3, "kwh_per_session": 12.037, "kwh_per_year": 1877.8 } ], "plunge_tap_temperature_sensitivity": [ { "tap_water_temp_f": 50, "ice_lb_per_100gal_fill": 0.0, "ice_bags_20lb": 0.0, "ice_cost_per_fill_usd_at_$3.00_bag": 0.0, "ice_cost_per_fill_usd_at_$4.00_bag": 0.0, "ice_cost_per_fill_usd_at_$5.00_bag": 0.0, "ice_cost_per_fill_usd_at_$6.00_bag": 0.0 }, { "tap_water_temp_f": 55, "ice_lb_per_100gal_fill": 25.8, "ice_bags_20lb": 1.29, "ice_cost_per_fill_usd_at_$3.00_bag": 3.87, "ice_cost_per_fill_usd_at_$4.00_bag": 5.16, "ice_cost_per_fill_usd_at_$5.00_bag": 6.45, "ice_cost_per_fill_usd_at_$6.00_bag": 7.75 }, { "tap_water_temp_f": 60, "ice_lb_per_100gal_fill": 51.6, "ice_bags_20lb": 2.58, "ice_cost_per_fill_usd_at_$3.00_bag": 7.75, "ice_cost_per_fill_usd_at_$4.00_bag": 10.33, "ice_cost_per_fill_usd_at_$5.00_bag": 12.91, "ice_cost_per_fill_usd_at_$6.00_bag": 15.49 }, { "tap_water_temp_f": 65, "ice_lb_per_100gal_fill": 77.5, "ice_bags_20lb": 3.87, "ice_cost_per_fill_usd_at_$3.00_bag": 11.62, "ice_cost_per_fill_usd_at_$4.00_bag": 15.49, "ice_cost_per_fill_usd_at_$5.00_bag": 19.36, "ice_cost_per_fill_usd_at_$6.00_bag": 23.24 }, { "tap_water_temp_f": 70, "ice_lb_per_100gal_fill": 103.3, "ice_bags_20lb": 5.16, "ice_cost_per_fill_usd_at_$3.00_bag": 15.49, "ice_cost_per_fill_usd_at_$4.00_bag": 20.65, "ice_cost_per_fill_usd_at_$5.00_bag": 25.82, "ice_cost_per_fill_usd_at_$6.00_bag": 30.98 }, { "tap_water_temp_f": 75, "ice_lb_per_100gal_fill": 129.1, "ice_bags_20lb": 6.45, "ice_cost_per_fill_usd_at_$3.00_bag": 19.36, "ice_cost_per_fill_usd_at_$4.00_bag": 25.82, "ice_cost_per_fill_usd_at_$5.00_bag": 32.27, "ice_cost_per_fill_usd_at_$6.00_bag": 38.73 }, { "tap_water_temp_f": 80, "ice_lb_per_100gal_fill": 154.9, "ice_bags_20lb": 7.75, "ice_cost_per_fill_usd_at_$3.00_bag": 23.24, "ice_cost_per_fill_usd_at_$4.00_bag": 30.98, "ice_cost_per_fill_usd_at_$5.00_bag": 38.73, "ice_cost_per_fill_usd_at_$6.00_bag": 46.47 }, { "tap_water_temp_f": 85, "ice_lb_per_100gal_fill": 180.7, "ice_bags_20lb": 9.04, "ice_cost_per_fill_usd_at_$3.00_bag": 27.11, "ice_cost_per_fill_usd_at_$4.00_bag": 36.14, "ice_cost_per_fill_usd_at_$5.00_bag": 45.18, "ice_cost_per_fill_usd_at_$6.00_bag": 54.22 } ], "states": [ { "state": "Alabama", "state_code": "AL", "census_division": "East South Central", "residential_price_cents_kwh_ytd_2026": 16.62, "residential_price_cents_kwh_ytd_2025": 15.96, "residential_price_cents_kwh_may_2026": 16.77, "noaa_annual_mean_air_temp_f_1991_2020": 63.6, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.08, "sauna_cost_per_session_usd_central": 1.46, "sauna_cost_per_session_usd_high": 2.0, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 15.8, "sauna_cost_per_year_usd_low": 112.78, "sauna_cost_per_year_usd_central": 189.59, "sauna_cost_per_year_usd_high": 312.1, "plunge_estimated_tap_water_temp_f": 69.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 98.6, "plunge_ice_bags_20lb_per_fill": 4.93, "plunge_ice_cost_per_fill_usd": 24.66, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 26.34, "plunge_cost_per_year_usd": 1369.62, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Alaska", "state_code": "AK", "census_division": "Pacific Noncontiguous", "residential_price_cents_kwh_ytd_2026": 26.68, "residential_price_cents_kwh_ytd_2025": 25.4, "residential_price_cents_kwh_may_2026": 28.23, "noaa_annual_mean_air_temp_f_1991_2020": 27.98, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.74, "sauna_cost_per_session_usd_central": 2.34, "sauna_cost_per_session_usd_high": 3.21, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 25.36, "sauna_cost_per_year_usd_low": 181.05, "sauna_cost_per_year_usd_central": 304.35, "sauna_cost_per_year_usd_high": 501.01, "plunge_estimated_tap_water_temp_f": 33.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Arizona", "state_code": "AZ", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 15.55, "residential_price_cents_kwh_ytd_2025": 15.3, "residential_price_cents_kwh_may_2026": 15.23, "noaa_annual_mean_air_temp_f_1991_2020": 61.07, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.01, "sauna_cost_per_session_usd_central": 1.36, "sauna_cost_per_session_usd_high": 1.87, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.78, "sauna_cost_per_year_usd_low": 105.52, "sauna_cost_per_year_usd_central": 177.39, "sauna_cost_per_year_usd_high": 292.01, "plunge_estimated_tap_water_temp_f": 66.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 85.2, "plunge_ice_bags_20lb_per_fill": 4.26, "plunge_ice_cost_per_fill_usd": 21.3, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 22.98, "plunge_cost_per_year_usd": 1195.1, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Arkansas", "state_code": "AR", "census_division": "West South Central", "residential_price_cents_kwh_ytd_2026": 13.28, "residential_price_cents_kwh_ytd_2025": 12.26, "residential_price_cents_kwh_may_2026": 14.36, "noaa_annual_mean_air_temp_f_1991_2020": 61.02, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.87, "sauna_cost_per_session_usd_central": 1.17, "sauna_cost_per_session_usd_high": 1.6, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.62, "sauna_cost_per_year_usd_low": 90.12, "sauna_cost_per_year_usd_central": 151.49, "sauna_cost_per_year_usd_high": 249.38, "plunge_estimated_tap_water_temp_f": 66.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 85.2, "plunge_ice_bags_20lb_per_fill": 4.26, "plunge_ice_cost_per_fill_usd": 21.3, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 22.98, "plunge_cost_per_year_usd": 1195.1, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "California", "state_code": "CA", "census_division": "Pacific Contiguous", "residential_price_cents_kwh_ytd_2026": 32.83, "residential_price_cents_kwh_ytd_2025": 32.15, "residential_price_cents_kwh_may_2026": 33.25, "noaa_annual_mean_air_temp_f_1991_2020": 59.0, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 2.14, "sauna_cost_per_session_usd_central": 2.88, "sauna_cost_per_session_usd_high": 3.95, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 31.21, "sauna_cost_per_year_usd_low": 222.78, "sauna_cost_per_year_usd_central": 374.51, "sauna_cost_per_year_usd_high": 616.5, "plunge_estimated_tap_water_temp_f": 64.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 74.9, "plunge_ice_bags_20lb_per_fill": 3.74, "plunge_ice_cost_per_fill_usd": 18.72, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 20.4, "plunge_cost_per_year_usd": 1060.84, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Colorado", "state_code": "CO", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 16.53, "residential_price_cents_kwh_ytd_2025": 15.21, "residential_price_cents_kwh_may_2026": 16.16, "noaa_annual_mean_air_temp_f_1991_2020": 46.19, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.08, "sauna_cost_per_session_usd_central": 1.45, "sauna_cost_per_session_usd_high": 1.99, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 15.71, "sauna_cost_per_year_usd_low": 112.17, "sauna_cost_per_year_usd_central": 188.57, "sauna_cost_per_year_usd_high": 310.41, "plunge_estimated_tap_water_temp_f": 51.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 8.8, "plunge_ice_bags_20lb_per_fill": 0.44, "plunge_ice_cost_per_fill_usd": 2.19, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 3.88, "plunge_cost_per_year_usd": 201.63, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Connecticut", "state_code": "CT", "census_division": "New England", "residential_price_cents_kwh_ytd_2026": 29.78, "residential_price_cents_kwh_ytd_2025": 31.8, "residential_price_cents_kwh_may_2026": 27.37, "noaa_annual_mean_air_temp_f_1991_2020": 49.92, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.94, "sauna_cost_per_session_usd_central": 2.61, "sauna_cost_per_session_usd_high": 3.58, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 28.31, "sauna_cost_per_year_usd_low": 202.09, "sauna_cost_per_year_usd_central": 339.72, "sauna_cost_per_year_usd_high": 559.22, "plunge_estimated_tap_water_temp_f": 55.4, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 27.9, "plunge_ice_bags_20lb_per_fill": 1.39, "plunge_ice_cost_per_fill_usd": 6.97, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 8.65, "plunge_cost_per_year_usd": 450.0, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Delaware", "state_code": "DE", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 17.45, "residential_price_cents_kwh_ytd_2025": 16.55, "residential_price_cents_kwh_may_2026": 19.38, "noaa_annual_mean_air_temp_f_1991_2020": 56.17, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.14, "sauna_cost_per_session_usd_central": 1.53, "sauna_cost_per_session_usd_high": 2.1, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 16.59, "sauna_cost_per_year_usd_low": 118.42, "sauna_cost_per_year_usd_central": 199.06, "sauna_cost_per_year_usd_high": 327.68, "plunge_estimated_tap_water_temp_f": 61.6, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 59.9, "plunge_ice_bags_20lb_per_fill": 2.99, "plunge_ice_cost_per_fill_usd": 14.97, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 16.66, "plunge_cost_per_year_usd": 866.18, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "District of Columbia", "state_code": "DC", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 24.57, "residential_price_cents_kwh_ytd_2025": 19.98, "residential_price_cents_kwh_may_2026": 25.4, "noaa_annual_mean_air_temp_f_1991_2020": 55.38, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.6, "sauna_cost_per_session_usd_central": 2.16, "sauna_cost_per_session_usd_high": 2.96, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 23.36, "sauna_cost_per_year_usd_low": 166.73, "sauna_cost_per_year_usd_central": 280.28, "sauna_cost_per_year_usd_high": 461.39, "plunge_estimated_tap_water_temp_f": 60.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 56.3, "plunge_ice_bags_20lb_per_fill": 2.81, "plunge_ice_cost_per_fill_usd": 14.07, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 15.75, "plunge_cost_per_year_usd": 819.19, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Florida", "state_code": "FL", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 15.43, "residential_price_cents_kwh_ytd_2025": 14.93, "residential_price_cents_kwh_may_2026": 15.17, "noaa_annual_mean_air_temp_f_1991_2020": 71.41, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.01, "sauna_cost_per_session_usd_central": 1.35, "sauna_cost_per_session_usd_high": 1.86, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.67, "sauna_cost_per_year_usd_low": 104.71, "sauna_cost_per_year_usd_central": 176.02, "sauna_cost_per_year_usd_high": 289.75, "plunge_estimated_tap_water_temp_f": 76.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 138.9, "plunge_ice_bags_20lb_per_fill": 6.94, "plunge_ice_cost_per_fill_usd": 34.72, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 36.41, "plunge_cost_per_year_usd": 1893.21, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Georgia", "state_code": "GA", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 14.9, "residential_price_cents_kwh_ytd_2025": 14.2, "residential_price_cents_kwh_may_2026": 15.84, "noaa_annual_mean_air_temp_f_1991_2020": 64.2, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.97, "sauna_cost_per_session_usd_central": 1.31, "sauna_cost_per_session_usd_high": 1.79, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.16, "sauna_cost_per_year_usd_low": 101.11, "sauna_cost_per_year_usd_central": 169.97, "sauna_cost_per_year_usd_high": 279.8, "plunge_estimated_tap_water_temp_f": 69.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 101.7, "plunge_ice_bags_20lb_per_fill": 5.09, "plunge_ice_cost_per_fill_usd": 25.43, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 27.11, "plunge_cost_per_year_usd": 1409.9, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Hawaii", "state_code": "HI", "census_division": "Pacific Noncontiguous", "residential_price_cents_kwh_ytd_2026": 44.61, "residential_price_cents_kwh_ytd_2025": 41.5, "residential_price_cents_kwh_may_2026": 52.0, "noaa_annual_mean_air_temp_f_1991_2020": 66.27, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 2.91, "sauna_cost_per_session_usd_central": 3.91, "sauna_cost_per_session_usd_high": 5.37, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 42.41, "sauna_cost_per_year_usd_low": 302.72, "sauna_cost_per_year_usd_central": 508.89, "sauna_cost_per_year_usd_high": 837.71, "plunge_estimated_tap_water_temp_f": 71.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 112.0, "plunge_ice_bags_20lb_per_fill": 5.6, "plunge_ice_cost_per_fill_usd": 28.01, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 29.7, "plunge_cost_per_year_usd": 1544.15, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Idaho", "state_code": "ID", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 12.52, "residential_price_cents_kwh_ytd_2025": 11.33, "residential_price_cents_kwh_may_2026": 12.35, "noaa_annual_mean_air_temp_f_1991_2020": 43.91, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.82, "sauna_cost_per_session_usd_central": 1.1, "sauna_cost_per_session_usd_high": 1.51, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 11.9, "sauna_cost_per_year_usd_low": 84.96, "sauna_cost_per_year_usd_central": 142.82, "sauna_cost_per_year_usd_high": 235.11, "plunge_estimated_tap_water_temp_f": 49.4, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Illinois", "state_code": "IL", "census_division": "East North Central", "residential_price_cents_kwh_ytd_2026": 19.06, "residential_price_cents_kwh_ytd_2025": 17.15, "residential_price_cents_kwh_may_2026": 23.85, "noaa_annual_mean_air_temp_f_1991_2020": 52.63, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.24, "sauna_cost_per_session_usd_central": 1.67, "sauna_cost_per_session_usd_high": 2.29, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 18.12, "sauna_cost_per_year_usd_low": 129.34, "sauna_cost_per_year_usd_central": 217.43, "sauna_cost_per_year_usd_high": 357.92, "plunge_estimated_tap_water_temp_f": 58.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 41.8, "plunge_ice_bags_20lb_per_fill": 2.09, "plunge_ice_cost_per_fill_usd": 10.46, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 12.14, "plunge_cost_per_year_usd": 631.24, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Indiana", "state_code": "IN", "census_division": "East North Central", "residential_price_cents_kwh_ytd_2026": 17.03, "residential_price_cents_kwh_ytd_2025": 15.63, "residential_price_cents_kwh_may_2026": 18.15, "noaa_annual_mean_air_temp_f_1991_2020": 52.36, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.11, "sauna_cost_per_session_usd_central": 1.49, "sauna_cost_per_session_usd_high": 2.05, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 16.19, "sauna_cost_per_year_usd_low": 115.57, "sauna_cost_per_year_usd_central": 194.27, "sauna_cost_per_year_usd_high": 319.8, "plunge_estimated_tap_water_temp_f": 57.8, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 40.3, "plunge_ice_bags_20lb_per_fill": 2.01, "plunge_ice_cost_per_fill_usd": 10.07, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 11.75, "plunge_cost_per_year_usd": 611.1, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Iowa", "state_code": "IA", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 13.31, "residential_price_cents_kwh_ytd_2025": 12.66, "residential_price_cents_kwh_may_2026": 14.14, "noaa_annual_mean_air_temp_f_1991_2020": 48.29, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.87, "sauna_cost_per_session_usd_central": 1.17, "sauna_cost_per_session_usd_high": 1.6, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.65, "sauna_cost_per_year_usd_low": 90.32, "sauna_cost_per_year_usd_central": 151.83, "sauna_cost_per_year_usd_high": 249.94, "plunge_estimated_tap_water_temp_f": 53.8, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 19.6, "plunge_ice_bags_20lb_per_fill": 0.98, "plunge_ice_cost_per_fill_usd": 4.91, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 6.59, "plunge_cost_per_year_usd": 342.6, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Kansas", "state_code": "KS", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 15.05, "residential_price_cents_kwh_ytd_2025": 14.07, "residential_price_cents_kwh_may_2026": 15.13, "noaa_annual_mean_air_temp_f_1991_2020": 55.05, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.98, "sauna_cost_per_session_usd_central": 1.32, "sauna_cost_per_session_usd_high": 1.81, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.31, "sauna_cost_per_year_usd_low": 102.13, "sauna_cost_per_year_usd_central": 171.68, "sauna_cost_per_year_usd_high": 282.62, "plunge_estimated_tap_water_temp_f": 60.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 54.2, "plunge_ice_bags_20lb_per_fill": 2.71, "plunge_ice_cost_per_fill_usd": 13.55, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 15.24, "plunge_cost_per_year_usd": 792.34, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Kentucky", "state_code": "KY", "census_division": "East South Central", "residential_price_cents_kwh_ytd_2026": 14.39, "residential_price_cents_kwh_ytd_2025": 13.06, "residential_price_cents_kwh_may_2026": 14.98, "noaa_annual_mean_air_temp_f_1991_2020": 56.33, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.94, "sauna_cost_per_session_usd_central": 1.26, "sauna_cost_per_session_usd_high": 1.73, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 13.68, "sauna_cost_per_year_usd_low": 97.65, "sauna_cost_per_year_usd_central": 164.15, "sauna_cost_per_year_usd_high": 270.22, "plunge_estimated_tap_water_temp_f": 61.8, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 60.9, "plunge_ice_bags_20lb_per_fill": 3.05, "plunge_ice_cost_per_fill_usd": 15.23, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 16.92, "plunge_cost_per_year_usd": 879.6, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Louisiana", "state_code": "LA", "census_division": "West South Central", "residential_price_cents_kwh_ytd_2026": 13.52, "residential_price_cents_kwh_ytd_2025": 12.43, "residential_price_cents_kwh_may_2026": 14.15, "noaa_annual_mean_air_temp_f_1991_2020": 67.13, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.88, "sauna_cost_per_session_usd_central": 1.19, "sauna_cost_per_session_usd_high": 1.63, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.85, "sauna_cost_per_year_usd_low": 91.75, "sauna_cost_per_year_usd_central": 154.23, "sauna_cost_per_year_usd_high": 253.89, "plunge_estimated_tap_water_temp_f": 72.6, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 116.7, "plunge_ice_bags_20lb_per_fill": 5.83, "plunge_ice_cost_per_fill_usd": 29.17, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 30.86, "plunge_cost_per_year_usd": 1604.57, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Maine", "state_code": "ME", "census_division": "New England", "residential_price_cents_kwh_ytd_2026": 29.68, "residential_price_cents_kwh_ytd_2025": 27.26, "residential_price_cents_kwh_may_2026": 28.63, "noaa_annual_mean_air_temp_f_1991_2020": 41.78, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.94, "sauna_cost_per_session_usd_central": 2.6, "sauna_cost_per_session_usd_high": 3.57, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 28.21, "sauna_cost_per_year_usd_low": 201.41, "sauna_cost_per_year_usd_central": 338.57, "sauna_cost_per_year_usd_high": 557.35, "plunge_estimated_tap_water_temp_f": 47.3, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Maryland", "state_code": "MD", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 21.16, "residential_price_cents_kwh_ytd_2025": 18.61, "residential_price_cents_kwh_may_2026": 21.77, "noaa_annual_mean_air_temp_f_1991_2020": 55.38, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.38, "sauna_cost_per_session_usd_central": 1.86, "sauna_cost_per_session_usd_high": 2.55, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 20.12, "sauna_cost_per_year_usd_low": 143.59, "sauna_cost_per_year_usd_central": 241.38, "sauna_cost_per_year_usd_high": 397.35, "plunge_estimated_tap_water_temp_f": 60.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 56.3, "plunge_ice_bags_20lb_per_fill": 2.81, "plunge_ice_cost_per_fill_usd": 14.07, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 15.75, "plunge_cost_per_year_usd": 819.19, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Massachusetts", "state_code": "MA", "census_division": "New England", "residential_price_cents_kwh_ytd_2026": 30.15, "residential_price_cents_kwh_ytd_2025": 30.24, "residential_price_cents_kwh_may_2026": 28.82, "noaa_annual_mean_air_temp_f_1991_2020": 48.75, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.97, "sauna_cost_per_session_usd_central": 2.65, "sauna_cost_per_session_usd_high": 3.63, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 28.66, "sauna_cost_per_year_usd_low": 204.6, "sauna_cost_per_year_usd_central": 343.94, "sauna_cost_per_year_usd_high": 566.17, "plunge_estimated_tap_water_temp_f": 54.2, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 21.7, "plunge_ice_bags_20lb_per_fill": 1.08, "plunge_ice_cost_per_fill_usd": 5.42, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 7.1, "plunge_cost_per_year_usd": 369.45, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Michigan", "state_code": "MI", "census_division": "East North Central", "residential_price_cents_kwh_ytd_2026": 20.72, "residential_price_cents_kwh_ytd_2025": 19.29, "residential_price_cents_kwh_may_2026": 22.01, "noaa_annual_mean_air_temp_f_1991_2020": 45.19, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.35, "sauna_cost_per_session_usd_central": 1.82, "sauna_cost_per_session_usd_high": 2.49, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 19.7, "sauna_cost_per_year_usd_low": 140.61, "sauna_cost_per_year_usd_central": 236.36, "sauna_cost_per_year_usd_high": 389.09, "plunge_estimated_tap_water_temp_f": 50.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 3.6, "plunge_ice_bags_20lb_per_fill": 0.18, "plunge_ice_cost_per_fill_usd": 0.9, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 2.59, "plunge_cost_per_year_usd": 134.5, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Minnesota", "state_code": "MN", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 15.67, "residential_price_cents_kwh_ytd_2025": 14.96, "residential_price_cents_kwh_may_2026": 16.95, "noaa_annual_mean_air_temp_f_1991_2020": 41.66, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.02, "sauna_cost_per_session_usd_central": 1.38, "sauna_cost_per_session_usd_high": 1.89, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.9, "sauna_cost_per_year_usd_low": 106.34, "sauna_cost_per_year_usd_central": 178.76, "sauna_cost_per_year_usd_high": 294.26, "plunge_estimated_tap_water_temp_f": 47.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Mississippi", "state_code": "MS", "census_division": "East South Central", "residential_price_cents_kwh_ytd_2026": 15.47, "residential_price_cents_kwh_ytd_2025": 13.98, "residential_price_cents_kwh_may_2026": 16.16, "noaa_annual_mean_air_temp_f_1991_2020": 64.18, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.01, "sauna_cost_per_session_usd_central": 1.36, "sauna_cost_per_session_usd_high": 1.86, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.71, "sauna_cost_per_year_usd_low": 104.98, "sauna_cost_per_year_usd_central": 176.47, "sauna_cost_per_year_usd_high": 290.5, "plunge_estimated_tap_water_temp_f": 69.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 101.7, "plunge_ice_bags_20lb_per_fill": 5.09, "plunge_ice_cost_per_fill_usd": 25.43, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 27.11, "plunge_cost_per_year_usd": 1409.9, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Missouri", "state_code": "MO", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 12.83, "residential_price_cents_kwh_ytd_2025": 11.89, "residential_price_cents_kwh_may_2026": 13.68, "noaa_annual_mean_air_temp_f_1991_2020": 55.24, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.84, "sauna_cost_per_session_usd_central": 1.13, "sauna_cost_per_session_usd_high": 1.54, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.2, "sauna_cost_per_year_usd_low": 87.06, "sauna_cost_per_year_usd_central": 146.36, "sauna_cost_per_year_usd_high": 240.93, "plunge_estimated_tap_water_temp_f": 60.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 55.2, "plunge_ice_bags_20lb_per_fill": 2.76, "plunge_ice_cost_per_fill_usd": 13.81, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 15.5, "plunge_cost_per_year_usd": 805.77, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Montana", "state_code": "MT", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 13.56, "residential_price_cents_kwh_ytd_2025": 11.91, "residential_price_cents_kwh_may_2026": 14.67, "noaa_annual_mean_air_temp_f_1991_2020": 42.55, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.88, "sauna_cost_per_session_usd_central": 1.19, "sauna_cost_per_session_usd_high": 1.63, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.89, "sauna_cost_per_year_usd_low": 92.02, "sauna_cost_per_year_usd_central": 154.69, "sauna_cost_per_year_usd_high": 254.64, "plunge_estimated_tap_water_temp_f": 48.0, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Nebraska", "state_code": "NE", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 12.59, "residential_price_cents_kwh_ytd_2025": 11.6, "residential_price_cents_kwh_may_2026": 13.59, "noaa_annual_mean_air_temp_f_1991_2020": 49.44, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.82, "sauna_cost_per_session_usd_central": 1.1, "sauna_cost_per_session_usd_high": 1.52, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 11.97, "sauna_cost_per_year_usd_low": 85.44, "sauna_cost_per_year_usd_central": 143.62, "sauna_cost_per_year_usd_high": 236.42, "plunge_estimated_tap_water_temp_f": 54.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 25.3, "plunge_ice_bags_20lb_per_fill": 1.27, "plunge_ice_cost_per_fill_usd": 6.33, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 8.01, "plunge_cost_per_year_usd": 416.43, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Nevada", "state_code": "NV", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 14.04, "residential_price_cents_kwh_ytd_2025": 13.86, "residential_price_cents_kwh_may_2026": 13.6, "noaa_annual_mean_air_temp_f_1991_2020": 51.03, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.92, "sauna_cost_per_session_usd_central": 1.23, "sauna_cost_per_session_usd_high": 1.69, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 13.35, "sauna_cost_per_year_usd_low": 95.28, "sauna_cost_per_year_usd_central": 160.16, "sauna_cost_per_year_usd_high": 263.65, "plunge_estimated_tap_water_temp_f": 56.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 33.6, "plunge_ice_bags_20lb_per_fill": 1.68, "plunge_ice_cost_per_fill_usd": 8.39, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 10.07, "plunge_cost_per_year_usd": 523.84, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "New Hampshire", "state_code": "NH", "census_division": "New England", "residential_price_cents_kwh_ytd_2026": 26.8, "residential_price_cents_kwh_ytd_2025": 23.34, "residential_price_cents_kwh_may_2026": 27.33, "noaa_annual_mean_air_temp_f_1991_2020": 44.05, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.75, "sauna_cost_per_session_usd_central": 2.35, "sauna_cost_per_session_usd_high": 3.23, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 25.48, "sauna_cost_per_year_usd_low": 181.86, "sauna_cost_per_year_usd_central": 305.72, "sauna_cost_per_year_usd_high": 503.26, "plunge_estimated_tap_water_temp_f": 49.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "New Jersey", "state_code": "NJ", "census_division": "Middle Atlantic", "residential_price_cents_kwh_ytd_2026": 23.28, "residential_price_cents_kwh_ytd_2025": 19.94, "residential_price_cents_kwh_may_2026": 23.27, "noaa_annual_mean_air_temp_f_1991_2020": 53.55, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.52, "sauna_cost_per_session_usd_central": 2.04, "sauna_cost_per_session_usd_high": 2.8, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 22.13, "sauna_cost_per_year_usd_low": 157.98, "sauna_cost_per_year_usd_central": 265.57, "sauna_cost_per_year_usd_high": 437.16, "plunge_estimated_tap_water_temp_f": 59.0, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 46.5, "plunge_ice_bags_20lb_per_fill": 2.32, "plunge_ice_cost_per_fill_usd": 11.62, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 13.3, "plunge_cost_per_year_usd": 691.65, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "New Mexico", "state_code": "NM", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 14.75, "residential_price_cents_kwh_ytd_2025": 14.32, "residential_price_cents_kwh_may_2026": 14.12, "noaa_annual_mean_air_temp_f_1991_2020": 54.46, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.96, "sauna_cost_per_session_usd_central": 1.29, "sauna_cost_per_session_usd_high": 1.78, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.02, "sauna_cost_per_year_usd_low": 100.09, "sauna_cost_per_year_usd_central": 168.26, "sauna_cost_per_year_usd_high": 276.98, "plunge_estimated_tap_water_temp_f": 59.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 51.1, "plunge_ice_bags_20lb_per_fill": 2.56, "plunge_ice_cost_per_fill_usd": 12.78, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 14.46, "plunge_cost_per_year_usd": 752.06, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "New York", "state_code": "NY", "census_division": "Middle Atlantic", "residential_price_cents_kwh_ytd_2026": 29.22, "residential_price_cents_kwh_ytd_2025": 25.84, "residential_price_cents_kwh_may_2026": 29.93, "noaa_annual_mean_air_temp_f_1991_2020": 46.01, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.91, "sauna_cost_per_session_usd_central": 2.56, "sauna_cost_per_session_usd_high": 3.52, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 27.78, "sauna_cost_per_year_usd_low": 198.29, "sauna_cost_per_year_usd_central": 333.33, "sauna_cost_per_year_usd_high": 548.71, "plunge_estimated_tap_water_temp_f": 51.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 7.7, "plunge_ice_bags_20lb_per_fill": 0.39, "plunge_ice_cost_per_fill_usd": 1.94, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 3.62, "plunge_cost_per_year_usd": 188.21, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "North Carolina", "state_code": "NC", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 14.93, "residential_price_cents_kwh_ytd_2025": 13.87, "residential_price_cents_kwh_may_2026": 15.09, "noaa_annual_mean_air_temp_f_1991_2020": 59.55, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.97, "sauna_cost_per_session_usd_central": 1.31, "sauna_cost_per_session_usd_high": 1.8, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.19, "sauna_cost_per_year_usd_low": 101.31, "sauna_cost_per_year_usd_central": 170.31, "sauna_cost_per_year_usd_high": 280.36, "plunge_estimated_tap_water_temp_f": 65.0, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 77.5, "plunge_ice_bags_20lb_per_fill": 3.87, "plunge_ice_cost_per_fill_usd": 19.36, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 21.05, "plunge_cost_per_year_usd": 1094.41, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "North Dakota", "state_code": "ND", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 11.92, "residential_price_cents_kwh_ytd_2025": 10.93, "residential_price_cents_kwh_may_2026": 13.61, "noaa_annual_mean_air_temp_f_1991_2020": 40.98, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.78, "sauna_cost_per_session_usd_central": 1.05, "sauna_cost_per_session_usd_high": 1.43, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 11.33, "sauna_cost_per_year_usd_low": 80.89, "sauna_cost_per_year_usd_central": 135.98, "sauna_cost_per_year_usd_high": 223.84, "plunge_estimated_tap_water_temp_f": 46.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Ohio", "state_code": "OH", "census_division": "East North Central", "residential_price_cents_kwh_ytd_2026": 18.4, "residential_price_cents_kwh_ytd_2025": 16.1, "residential_price_cents_kwh_may_2026": 19.52, "noaa_annual_mean_air_temp_f_1991_2020": 51.66, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.2, "sauna_cost_per_session_usd_central": 1.61, "sauna_cost_per_session_usd_high": 2.21, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 17.49, "sauna_cost_per_year_usd_low": 124.86, "sauna_cost_per_year_usd_central": 209.9, "sauna_cost_per_year_usd_high": 345.52, "plunge_estimated_tap_water_temp_f": 57.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 36.7, "plunge_ice_bags_20lb_per_fill": 1.83, "plunge_ice_cost_per_fill_usd": 9.17, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 10.85, "plunge_cost_per_year_usd": 564.11, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Oklahoma", "state_code": "OK", "census_division": "West South Central", "residential_price_cents_kwh_ytd_2026": 13.1, "residential_price_cents_kwh_ytd_2025": 12.06, "residential_price_cents_kwh_may_2026": 13.38, "noaa_annual_mean_air_temp_f_1991_2020": 60.3, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.85, "sauna_cost_per_session_usd_central": 1.15, "sauna_cost_per_session_usd_high": 1.58, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.45, "sauna_cost_per_year_usd_low": 88.9, "sauna_cost_per_year_usd_central": 149.44, "sauna_cost_per_year_usd_high": 246.0, "plunge_estimated_tap_water_temp_f": 65.8, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 81.6, "plunge_ice_bags_20lb_per_fill": 4.08, "plunge_ice_cost_per_fill_usd": 20.4, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 22.08, "plunge_cost_per_year_usd": 1148.11, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Oregon", "state_code": "OR", "census_division": "Pacific Contiguous", "residential_price_cents_kwh_ytd_2026": 15.14, "residential_price_cents_kwh_ytd_2025": 15.01, "residential_price_cents_kwh_may_2026": 16.27, "noaa_annual_mean_air_temp_f_1991_2020": 47.9, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.99, "sauna_cost_per_session_usd_central": 1.33, "sauna_cost_per_session_usd_high": 1.82, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.39, "sauna_cost_per_year_usd_low": 102.74, "sauna_cost_per_year_usd_central": 172.71, "sauna_cost_per_year_usd_high": 284.31, "plunge_estimated_tap_water_temp_f": 53.4, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 17.6, "plunge_ice_bags_20lb_per_fill": 0.88, "plunge_ice_cost_per_fill_usd": 4.39, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 6.07, "plunge_cost_per_year_usd": 315.74, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Pennsylvania", "state_code": "PA", "census_division": "Middle Atlantic", "residential_price_cents_kwh_ytd_2026": 20.75, "residential_price_cents_kwh_ytd_2025": 18.3, "residential_price_cents_kwh_may_2026": 21.55, "noaa_annual_mean_air_temp_f_1991_2020": 49.46, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.35, "sauna_cost_per_session_usd_central": 1.82, "sauna_cost_per_session_usd_high": 2.5, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 19.73, "sauna_cost_per_year_usd_low": 140.81, "sauna_cost_per_year_usd_central": 236.71, "sauna_cost_per_year_usd_high": 389.65, "plunge_estimated_tap_water_temp_f": 54.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 25.3, "plunge_ice_bags_20lb_per_fill": 1.27, "plunge_ice_cost_per_fill_usd": 6.33, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 8.01, "plunge_cost_per_year_usd": 416.43, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Rhode Island", "state_code": "RI", "census_division": "New England", "residential_price_cents_kwh_ytd_2026": 29.48, "residential_price_cents_kwh_ytd_2025": 31.19, "residential_price_cents_kwh_may_2026": 29.46, "noaa_annual_mean_air_temp_f_1991_2020": 50.66, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.92, "sauna_cost_per_session_usd_central": 2.59, "sauna_cost_per_session_usd_high": 3.55, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 28.02, "sauna_cost_per_year_usd_low": 200.05, "sauna_cost_per_year_usd_central": 336.29, "sauna_cost_per_year_usd_high": 553.59, "plunge_estimated_tap_water_temp_f": 56.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 31.5, "plunge_ice_bags_20lb_per_fill": 1.57, "plunge_ice_cost_per_fill_usd": 7.87, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 9.56, "plunge_cost_per_year_usd": 496.99, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "South Carolina", "state_code": "SC", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 16.16, "residential_price_cents_kwh_ytd_2025": 14.83, "residential_price_cents_kwh_may_2026": 16.18, "noaa_annual_mean_air_temp_f_1991_2020": 63.37, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.05, "sauna_cost_per_session_usd_central": 1.42, "sauna_cost_per_session_usd_high": 1.95, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 15.36, "sauna_cost_per_year_usd_low": 109.66, "sauna_cost_per_year_usd_central": 184.35, "sauna_cost_per_year_usd_high": 303.46, "plunge_estimated_tap_water_temp_f": 68.8, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 97.1, "plunge_ice_bags_20lb_per_fill": 4.85, "plunge_ice_cost_per_fill_usd": 24.27, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 25.95, "plunge_cost_per_year_usd": 1349.49, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "South Dakota", "state_code": "SD", "census_division": "West North Central", "residential_price_cents_kwh_ytd_2026": 14.15, "residential_price_cents_kwh_ytd_2025": 12.69, "residential_price_cents_kwh_may_2026": 15.73, "noaa_annual_mean_air_temp_f_1991_2020": 45.65, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.92, "sauna_cost_per_session_usd_central": 1.24, "sauna_cost_per_session_usd_high": 1.7, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 13.45, "sauna_cost_per_year_usd_low": 96.02, "sauna_cost_per_year_usd_central": 161.42, "sauna_cost_per_year_usd_high": 265.72, "plunge_estimated_tap_water_temp_f": 51.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 5.7, "plunge_ice_bags_20lb_per_fill": 0.28, "plunge_ice_cost_per_fill_usd": 1.42, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 3.1, "plunge_cost_per_year_usd": 161.35, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Tennessee", "state_code": "TN", "census_division": "East South Central", "residential_price_cents_kwh_ytd_2026": 13.87, "residential_price_cents_kwh_ytd_2025": 13.11, "residential_price_cents_kwh_may_2026": 14.47, "noaa_annual_mean_air_temp_f_1991_2020": 58.45, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.91, "sauna_cost_per_session_usd_central": 1.22, "sauna_cost_per_session_usd_high": 1.67, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 13.19, "sauna_cost_per_year_usd_low": 94.12, "sauna_cost_per_year_usd_central": 158.22, "sauna_cost_per_year_usd_high": 260.46, "plunge_estimated_tap_water_temp_f": 63.9, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 71.8, "plunge_ice_bags_20lb_per_fill": 3.59, "plunge_ice_cost_per_fill_usd": 17.94, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 19.63, "plunge_cost_per_year_usd": 1020.57, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Texas", "state_code": "TX", "census_division": "West South Central", "residential_price_cents_kwh_ytd_2026": 16.15, "residential_price_cents_kwh_ytd_2025": 15.14, "residential_price_cents_kwh_may_2026": 16.44, "noaa_annual_mean_air_temp_f_1991_2020": 65.78, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.05, "sauna_cost_per_session_usd_central": 1.42, "sauna_cost_per_session_usd_high": 1.94, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 15.35, "sauna_cost_per_year_usd_low": 109.59, "sauna_cost_per_year_usd_central": 184.23, "sauna_cost_per_year_usd_high": 303.27, "plunge_estimated_tap_water_temp_f": 71.3, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 110.0, "plunge_ice_bags_20lb_per_fill": 5.5, "plunge_ice_cost_per_fill_usd": 27.5, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 29.18, "plunge_cost_per_year_usd": 1517.3, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Utah", "state_code": "UT", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 13.12, "residential_price_cents_kwh_ytd_2025": 12.39, "residential_price_cents_kwh_may_2026": 12.96, "noaa_annual_mean_air_temp_f_1991_2020": 49.2, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.86, "sauna_cost_per_session_usd_central": 1.15, "sauna_cost_per_session_usd_high": 1.58, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.47, "sauna_cost_per_year_usd_low": 89.03, "sauna_cost_per_year_usd_central": 149.67, "sauna_cost_per_year_usd_high": 246.37, "plunge_estimated_tap_water_temp_f": 54.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 24.3, "plunge_ice_bags_20lb_per_fill": 1.21, "plunge_ice_cost_per_fill_usd": 6.07, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 7.75, "plunge_cost_per_year_usd": 403.01, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Vermont", "state_code": "VT", "census_division": "New England", "residential_price_cents_kwh_ytd_2026": 23.9, "residential_price_cents_kwh_ytd_2025": 22.44, "residential_price_cents_kwh_may_2026": 24.89, "noaa_annual_mean_air_temp_f_1991_2020": 43.04, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.56, "sauna_cost_per_session_usd_central": 2.1, "sauna_cost_per_session_usd_high": 2.88, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 22.72, "sauna_cost_per_year_usd_low": 162.19, "sauna_cost_per_year_usd_central": 272.64, "sauna_cost_per_year_usd_high": 448.81, "plunge_estimated_tap_water_temp_f": 48.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Virginia", "state_code": "VA", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 16.58, "residential_price_cents_kwh_ytd_2025": 14.57, "residential_price_cents_kwh_may_2026": 17.61, "noaa_annual_mean_air_temp_f_1991_2020": 55.99, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.08, "sauna_cost_per_session_usd_central": 1.45, "sauna_cost_per_session_usd_high": 2.0, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 15.76, "sauna_cost_per_year_usd_low": 112.51, "sauna_cost_per_year_usd_central": 189.14, "sauna_cost_per_year_usd_high": 311.35, "plunge_estimated_tap_water_temp_f": 61.5, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 59.4, "plunge_ice_bags_20lb_per_fill": 2.97, "plunge_ice_cost_per_fill_usd": 14.85, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 16.53, "plunge_cost_per_year_usd": 859.47, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Washington", "state_code": "WA", "census_division": "Pacific Contiguous", "residential_price_cents_kwh_ytd_2026": 14.27, "residential_price_cents_kwh_ytd_2025": 12.58, "residential_price_cents_kwh_may_2026": 14.95, "noaa_annual_mean_air_temp_f_1991_2020": 47.28, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.93, "sauna_cost_per_session_usd_central": 1.25, "sauna_cost_per_session_usd_high": 1.72, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 13.57, "sauna_cost_per_year_usd_low": 96.84, "sauna_cost_per_year_usd_central": 162.79, "sauna_cost_per_year_usd_high": 267.97, "plunge_estimated_tap_water_temp_f": 52.8, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 14.5, "plunge_ice_bags_20lb_per_fill": 0.72, "plunge_ice_cost_per_fill_usd": 3.61, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 5.3, "plunge_cost_per_year_usd": 275.47, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "West Virginia", "state_code": "WV", "census_division": "South Atlantic", "residential_price_cents_kwh_ytd_2026": 15.41, "residential_price_cents_kwh_ytd_2025": 15.25, "residential_price_cents_kwh_may_2026": 16.8, "noaa_annual_mean_air_temp_f_1991_2020": 52.64, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.01, "sauna_cost_per_session_usd_central": 1.35, "sauna_cost_per_session_usd_high": 1.85, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 14.65, "sauna_cost_per_year_usd_low": 104.57, "sauna_cost_per_year_usd_central": 175.79, "sauna_cost_per_year_usd_high": 289.38, "plunge_estimated_tap_water_temp_f": 58.1, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 41.8, "plunge_ice_bags_20lb_per_fill": 2.09, "plunge_ice_cost_per_fill_usd": 10.46, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 12.14, "plunge_cost_per_year_usd": 631.24, "plunge_annual_mean_at_or_below_target": false, "plunge_notes": "Annual mean. Summer ice cost runs above this figure and winter below." }, { "state": "Wisconsin", "state_code": "WI", "census_division": "East North Central", "residential_price_cents_kwh_ytd_2026": 18.87, "residential_price_cents_kwh_ytd_2025": 17.86, "residential_price_cents_kwh_may_2026": 19.74, "noaa_annual_mean_air_temp_f_1991_2020": 43.84, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 1.23, "sauna_cost_per_session_usd_central": 1.66, "sauna_cost_per_session_usd_high": 2.27, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 17.94, "sauna_cost_per_year_usd_low": 128.05, "sauna_cost_per_year_usd_central": 215.26, "sauna_cost_per_year_usd_high": 354.35, "plunge_estimated_tap_water_temp_f": 49.3, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." }, { "state": "Wyoming", "state_code": "WY", "census_division": "Mountain", "residential_price_cents_kwh_ytd_2026": 13.66, "residential_price_cents_kwh_ytd_2025": 12.37, "residential_price_cents_kwh_may_2026": 14.8, "noaa_annual_mean_air_temp_f_1991_2020": 42.25, "sauna_kwh_per_session_central": 8.78, "sauna_cost_per_session_usd_low": 0.89, "sauna_cost_per_session_usd_central": 1.2, "sauna_cost_per_session_usd_high": 1.64, "sauna_kwh_per_year_central": 1140.8, "sauna_cost_per_month_usd_central": 12.99, "sauna_cost_per_year_usd_low": 92.7, "sauna_cost_per_year_usd_central": 155.83, "sauna_cost_per_year_usd_high": 256.51, "plunge_estimated_tap_water_temp_f": 47.7, "plunge_electricity_kwh_per_year": 0, "plunge_electricity_cost_usd_per_year": 0.0, "plunge_ice_lb_per_fill": 0.0, "plunge_ice_bags_20lb_per_fill": 0.0, "plunge_ice_cost_per_fill_usd": 0.0, "plunge_water_cost_per_fill_usd": 1.68, "plunge_cost_per_fill_usd": 1.68, "plunge_cost_per_year_usd": 87.52, "plunge_annual_mean_at_or_below_target": true, "plunge_notes": "ANNUAL MEAN ONLY. This state's estimated annual mean tap temperature is at or below the 50F target, so the annual-mean model returns zero ice and the cost shown is WATER ONLY. This does NOT mean an ice bath is free here year-round: summer tap water in this state runs well above 50F and will require ice. Use the tap-temperature sensitivity table for a summer figure." } ] }