Key facts
- Penguin 1/2 HP: 110 to 120V, 3.9 A, 450 W, 5,000 BTU/hr.
- Penguin 1 HP: 110 to 120V, 7.2 A, 830 W, 10,000 BTU/hr.
- Penguin ambient operating range: about 37 to 100°F. Leave 12 inches open on all sides.
- EIA July 2026 residential rates: WA 14.71¢, OR 15.97¢, US 18.31¢ per kWh.
- A permanently installed plunge falls under NEC 680.45 and needs GFCI protection unless built in (per Mike Holt).
Chiller comparison
| Chiller | Watts | kWh per running hour | Cooling | Source |
|---|---|---|---|---|
| Penguin 1/2 HP | 450 | 0.45 | 5,000 BTU/hr | Penguin |
| Active Aqua 1/2 HP | 510 | 0.51 | 4,020 BTU/hr | Retailer listing |
| Penguin 1 HP | 830 | 0.83 | 10,000 BTU/hr | Penguin |
| Active Aqua 1 HP | 1,100 | 1.10 | 10,050 BTU/hr | Retailer listing |
The kWh column is simple arithmetic: watts divided by 1,000. Active Aqua figures come from retailer listings, so confirm them on the unit label.
How to estimate your running cost
- Find your chiller's watts on its label or spec page.
- Log how many hours a day the compressor actually runs for a week. This varies with weather, lid use and target temperature, and no maker we checked publishes a fixed hours-per-day figure.
- Watts times hours, divided by 1,000, gives kWh per day.
- Multiply by the per-kWh rate on your electric bill.
Monthly cost by state
Residential rates are from the EIA Electric Power Monthly, Table 5.6.A, July 2026. The 8 hours a day of running is our assumption, not a maker figure. One cost calculator, from Restore Suite, calls 4 to 10 hours a day typical.
| Area | Rate (July 2026) | 1 HP Penguin, 830 W, 8 h/day assumed (199 kWh/mo) | 4 h/day assumed | 12 h/day assumed |
|---|---|---|---|---|
| Washington | 14.71¢/kWh | $29.30/mo | $14.65/mo | $43.95/mo |
| Oregon | 15.97¢/kWh | $31.81/mo | $15.91/mo | $47.72/mo |
| US average | 18.31¢/kWh | $36.47/mo | $18.24/mo | $54.71/mo |
Penguin's own estimate for its barrel chiller package is "As low as $18/month (estimated operating cost at $0.12/kWh)." A separate circulation pump, if your setup has one, adds to these figures and is not included.
Placement that keeps costs down
Per Penguin's owner material (seen via a dealer-hosted copy of the manual), keep 12 inches of open space around the chiller and never box it in. Drain before freezing weather. In hot climates such as Las Vegas, where summer highs exceed Penguin's listed 100°F limit, shade matters most.
Related guides
- How to drain a hot tub or cold plunge in Atlanta, Los Angeles, Tampa, Phoenix and Seattle
- Cold plunge GFCI and electrical requirements
- Outdoor cold plunge in a Seattle or Portland winter
- How loud is a cold plunge chiller, and where should it go?
- Cold plunge chillers in Las Vegas heat
- Made in USA: exact maker claims and sources
- Cold plunge collection
- Best cold plunges of 2026, ranked by use case
More buying guides
- What size chiller do you need?
- How to drain a hot tub or cold plunge in Nashville and Charlotte
- Cold plunge chiller costs in Columbus, Milwaukee, Louisville and Kansas City
Frequently asked questions
How much electricity does a cold plunge chiller use?
While the compressor is running, Penguin lists its 1/2 HP chiller at 450 watts and its 1 HP chiller at 830 watts. That is 0.45 and 0.83 kilowatt-hours per running hour. Retailers list the Active Aqua 1 HP at 1,100 watts. Total daily use depends on how many hours the chiller actually runs, which varies with climate, lid use and target temperature.
How much does a cold plunge chiller cost to run per month?
It depends on run hours, which no maker we checked publishes as a fixed figure. Assuming a 1 HP Penguin at 830 watts runs 8 hours a day, it uses about 199 kWh a month. At EIA July 2026 residential rates that is about $29.30 in Washington, $31.81 in Oregon and $36.47 at the US average. Penguin estimates as low as $18 a month for its barrel package at $0.12/kWh.
How do I estimate what my chiller costs to run?
Multiply the chiller's watts by its running hours, divide by 1,000 to get kilowatt-hours, then multiply by the rate on your power bill. For example, an 830 watt chiller running 8 hours uses 6.64 kWh a day. At the Washington July 2026 average of 14.71 cents per kWh, that is about 98 cents a day. Use your own rate and logged run time.
Is a 1/2 HP or 1 HP chiller better?
A 1 HP chiller moves about twice the heat. Penguin rates its 1/2 HP at 5,000 BTU/hr and its 1 HP at 10,000 BTU/hr. It draws more power per hour but reaches temperature faster. For an outdoor plunge in a hot climate, a larger chiller is our reasoned suggestion, not a maker spec. Ask the plunge maker which chiller they pair with your tub size.
Can a cold plunge chiller run on a normal outlet?
The common sizes do. Penguin's 1/2 HP and 1 HP chillers run on 110 to 120V and draw 3.9 and 7.2 amps. A dedicated 20 amp circuit is common practice, though we have no code citation that requires one. A permanently installed plunge should also have GFCI protection, so have an electrician check the outlet.
Does a cold plunge need GFCI protection?
Plan on it. Mike Holt's guide to NEC Article 680 says a permanently installed immersion pool, including a cold plunge, falls under 680.45, which applies the spa rules. Under 680.44 the supply outlet needs GFCI protection unless the listed unit has it built in. Mike Holt is a secondary source, so your electrician and inspector have the final word.
How much space does a chiller need around it?
Penguin's owner material calls for at least 12 inches of open space on all sides. It also says not to enclose the chiller in a cabinet or let its hot exhaust recirculate. A chiller works by dumping heat into the air, so a cramped spot makes it run longer and use more power. Check the manual that ships with your unit.
What temperatures can a chiller run in?
Penguin lists an ambient operating range of about 37 to 100°F and says to drain the chiller before freezing weather. Its outdoor 1/2 HP HE model is designed for outdoor use in all weather except freezing. Outside that range, shade, a lid and winter draining matter. Other brands publish their own limits, so read your chiller's manual.
How can I lower what my cold plunge costs to run?
Our reasoned tips, not maker specs: keep an insulated lid on whenever you are not using the plunge, shade the tub and the chiller, keep the 12 inch clearance clear, and clean filters often. Each one reduces the heat the chiller has to remove, which cuts running hours. Setting a slightly warmer target temperature also helps.
Are there American-made cold plunge chillers?
Penguin Chillers titles its product pages "Made in TN, USA," and The Cold Life says its chiller is "USA-Manufactured and engineered in TN." We keep dated copies of those claims and confirm per model in writing before badging any product. See our Made in USA section for the exact wording and sources.
Keep reading
Browse our cold plunges collection, see all guides, or ask us a question about your project.