How much does it cost to run a cold plunge?
Electricity cost is the ongoing expense of cold plunge ownership. Use this calculator to estimate your monthly and annual costs based on your specific setup.
Interactive electricity cost calculator
Cold Plunge Electricity Calculator
Enter your values and click Calculate.
Average costs by chiller size
Based on 5 hours/day runtime and $0.16/kWh electricity rate:
| Chiller HP | Wattage | Daily cost | Monthly cost | Annual cost |
|---|---|---|---|---|
| 1/4 HP | 187W | $0.15 | $4.50 | $55 |
| 1/3 HP | 249W | $0.20 | $6.00 | $73 |
| 1/2 HP | 373W | $0.30 | $9.00 | $109 |
| 3/4 HP | 560W | $0.45 | $13.50 | $164 |
| 1 HP | 746W | $0.60 | $18.00 | $219 |
| 1.5 HP | 1,119W | $0.90 | $27.00 | $328 |
| 2 HP | 1,492W | $1.20 | $36.00 | $438 |
How to find your electricity rate
Check your most recent electricity bill. Look for:
- "Price per kWh" or "Rate" — typically $0.10-0.30 per kWh in the US
- "Supply charge" + "Delivery charge" — add both for total rate
- Time-of-use rates — some areas have cheaper off-peak rates (nights/weekends)
US average: $0.16/kWh. Highest: Hawaii ($0.34), California ($0.25). Lowest: Washington ($0.10), Louisiana ($0.09).
How to reduce electricity costs
1. Insulate your tub (biggest impact)
An uninsulated stock tank loses 4-6°F per day. Insulated, it loses 1-2°F. That's the difference between a chiller running 12 hours/day vs 4 hours/day — a 70% reduction in electricity use.
Required insulation:
- 2" XPS foam board around sides and bottom
- Insulated cover on top
- Foam pipe insulation on all exposed plumbing
2. Run chiller during off-peak hours
If your utility has time-of-use rates, schedule your chiller to run overnight (typically 10 PM - 6 AM). Use a smart plug to automate this. Savings: 30-50% on electricity costs.
3. Shade the chiller
Direct sunlight on your chiller reduces efficiency by 15-25%. Position chiller in shade or build a small shade structure.
4. Keep condenser coils clean
Dusty coils reduce efficiency by 10-20%. Vacuum monthly with brush attachment.
5. Use a smart temperature setting
Don't set your chiller to 39°F if you plunge at 45°F. The colder the water, the harder the chiller works. Set to your actual plunge temperature.
6. Don't over-plunge
Each plunge session warms the water 2-3°F (your body heat). Multiple plunges per day = more chiller runtime. Limit to 1-2 sessions per day for efficiency.
Cost comparison: DIY plunge vs commercial plunge studio
| Option | Per session cost | Monthly cost (12 sessions) |
|---|---|---|
| DIY plunge (electricity only) | $0.30-0.60 | $4-7 |
| Commercial plunge studio | $25-40 | $300-480 |
| Savings (DIY) | $24-40/session | $296-473/month |
Over a year, DIY plunge saves $3,500-5,600 vs commercial studio. A $1,000 DIY build pays for itself in 2-4 months.
Recommended gear for electricity savings
- Smart plug — Schedule chiller for off-peak hours
- Insulated cover — Reduces cooling load by 50%
- WiFi controller — Monitor and adjust remotely
- Hygrometer — Track ambient conditions
- Anti-fatigue mat — Insulates floor under tub
The single biggest electricity saver is INSULATION. An uninsulated 50-gal tub with 1/2 HP chiller in a hot garage can cost $30-50/month. The same setup, well-insulated, costs $10-15/month. Insulation pays for itself in 2-3 months of electricity savings.
For chiller sizing, see our chiller sizing calculator. For ice vs chiller cost comparison, see our comparison page. For full cost breakdown, see our budget guide.