How much electricity does a cold plunge use? A typical 120V plug-in chiller draws a few hundred watts while its compressor runs. The Penguin Cold Therapy Chiller, for example, lists 450 watts, and Penguin estimates it costs $18 to $28 a month at $0.12 per kWh. At the current US average residential rate of 18.31 cents per kWh (EIA, July 2026), that same estimate scales to roughly $27 to $43 a month. Your real cold plunge electricity cost depends on how many hours the chiller runs, your local rate, and how well the tub holds its cold.
The cold plunge electricity cost formula
You only need three numbers: the chiller’s wattage, the hours it actually runs per day, and your electricity rate.
- Watts x hours running per day / 1,000 = kWh per day
- kWh per day x your rate per kWh = cost per day
- Cost per day x 30 = cost per month
Find the wattage on the product page, the spec sheet or the nameplate on the unit. For your rate, divide your utility bill’s total charges by kWh used.
If a chiller lists only amps and volts, multiply them: amps x volts = watts. Treat that number as an upper bound. The amp rating describes the most current the unit is expected to draw, and real running watts are usually at or below it.
Chiller power consumption: what our listings say
Prices below come from our public listings and can change. Electrical specs are the manufacturer’s, and we only list what appears on the product page.
| Unit | Listed power specs | Range | Price |
|---|---|---|---|
| Penguin Cold Therapy Chiller with Filter Kit | 3/4 HP, 7,500 BTU/hr, 110 to 120V, 450 W, 3.9 A | Low 40s °F, high 30s in optimal conditions | $2,641 |
| Coldture Water Chiller | Wattage not listed | 37 °F to 105 °F | $3,824 |
| KPlunge 3/4 HP Chiller and Heater | 3/4 HP, wattage not listed | 38 °F to 104 °F | $2,999 |
| KPlunge 1 HP Chiller and Heater | 1 HP, wattage not listed | 38 °F to 104 °F | $3,499 |
| Cal Spas Dual Zone DZChill | 220V spa, 120V chiller with 24/7 circulation pump | 39 °F to 104 °F | $13,140 |
The Penguin is the only chiller here with a listed wattage, so it anchors the examples. For the others, ask us for the spec sheet or read the nameplate, then plug the watts into the formula.
Worked examples using the Penguin chiller
Worst case: running nonstop
450 W x 24 hours / 1,000 = 10.8 kWh per day. At 18.31 cents, that is about $1.98 a day, or about $59 per 30 days. Using amps x volts instead (3.9 A x 120V = 468 W) gives about 11.2 kWh a day and about $62 a month. That is the ceiling, not the expected bill.
Running half the day
450 W x 12 hours / 1,000 = 5.4 kWh per day, about $0.99 a day, or about $30 a month.
Running 8 hours a day
450 W x 8 hours / 1,000 = 3.6 kWh per day, about $0.66 a day, or about $20 a month.
Penguin’s own estimate at today’s rates
Penguin’s $18 to $28 a month at $0.12 per kWh works out to about 150 to 233 kWh a month, or 5 to 7.8 kWh a day. That is well under the 10.8 kWh of nonstop running, which fits Penguin’s statement that the compressor and fan only run as needed. Applying those kWh figures to EIA’s July 2026 residential averages:
| Location | Residential rate (July 2026) | Estimated monthly cost |
|---|---|---|
| US average | 18.31 cents/kWh | About $27 to $43 |
| Texas | 15.88 cents/kWh | About $24 to $37 |
| Florida | 15.03 cents/kWh | About $23 to $35 |
| New York | 29.90 cents/kWh | About $45 to $70 |
| California | 33.61 cents/kWh | About $50 to $78 |
These are our calculations from Penguin’s estimate and EIA’s Electric Power Monthly, Table 5.6.A. Your utility rate is what counts.
Duty cycle: why the chiller runs less once it is cold
A chiller works hardest on the first pulldown, when it is taking a fresh fill of tap water down to plunge temperature. Once the water reaches the set point, the compressor cycles off and only comes back on to replace heat that leaks in from the air, the ground, sunlight and your body. The share of time it runs is the duty cycle. No listing we carry publishes a duty cycle percentage, so we will not guess one. The practical way to learn yours is a plug-in energy meter: read it after a week and divide by seven.
What raises cold plunge running cost
- Room or outdoor temperature. The bigger the gap between the air and the water, the more heat leaks in. A plunge in a cool basement costs less to hold than one on a hot patio. Our indoor cold plunge guide covers placement.
- Lid and cover use. An open tub gains heat from the air and sun. Keep the cover on between sessions. The Polar Plunge, for example, offers an optional roll-up cover.
- Set temperature. Holding 39 °F takes more work than holding 50 °F.
- Sun. Direct sun on the water or a dark shell adds heat. Shade helps.
- Insulation. Dundalk says the Eastern White Cedar of its Baltic Plunge Tub has natural insulating properties. Thin walls lose cold faster.
- Pumps, ozone and UV. Circulation pumps, ozone generators and UV sanitizers draw power on their own schedule. The DZChill lists a 24/7 circulation pump.
- Heating in all-in-one units. Hot and cold units such as the Borealis 69-inch cold plunge and hot tub ($7,999) heat to 104 °F. Every swing from cold to hot and back is extra energy.
- Tub size. More water takes longer to pull down. The Polar Plunge Tub ($3,444) holds 190 gallons and the Baltic holds 150. See our cold plunge chiller size guide for matching HP to volume.
Chiller vs bagged ice
An inflatable tub like the Tru Grit Fitness Inflatable Ice Bath ($999) uses no electricity, but you pay for ice every session. Ice prices vary by store and region, so we will not quote one. Price a few bags locally, multiply by the bags it takes to chill your tub, then by sessions per month. For daily use, ice and store trips add up. Occasional users may prefer ice. Our inflatable ice bath vs cold plunge with chiller comparison walks through the tradeoffs.
Electrical basics before you plug in
The Penguin ships with a 10-foot cord with GFCI protection. Plug any chiller into a GFCI-protected outlet, ideally on a dedicated circuit, so a compressor start does not trip a breaker shared with other loads. Avoid extension cords unless the manufacturer allows them. Spa-side equipment like the DZChill’s 220V supply needs a hardwired circuit. A licensed electrician and your local code have the final word on wiring, GFCI and clearances.
A note on cold exposure
Cold water immersion is a real stress on the body. Benefits on product pages are manufacturer claims. Talk with your doctor before starting, especially with a heart condition, high blood pressure or pregnancy, and keep early sessions short.
Frequently asked questions
What is the typical cold plunge running cost per month?
Penguin estimates $18 to $28 a month at $0.12 per kWh for its chiller. At the July 2026 US average of 18.31 cents, that is about $27 to $43. Your rate and setup change the number.
How do I calculate chiller power consumption?
Watts x hours running per day / 1,000 = kWh per day. Multiply by your rate. If only amps and volts are listed, amps x volts gives an upper-bound wattage.
Does a chiller run 24 hours a day?
Usually not once the water is cold. The compressor cycles on and off to hold the set point. A plug-in energy meter shows your real usage.
Do all-in-one hot and cold units cost more to run?
They can, if you use the heating side. Heating to 104 °F and then chilling back down takes extra energy.
Get help choosing an efficient setup
Start with our cold plunge buying guide or browse Dundalk LeisureCraft tubs and chillers. Call 866-777-2590, Monday to Friday, 9AM to 6PM PST, for spec sheets or help matching a chiller to your tub. Shipping is free on orders of $999 or more and $200 flat below that. See our return and refund policy for details.
