For most men using a home infrared sauna four times a week for around 30 minutes, yearly electricity costs fall between $30 and $80, based on a typical unit drawing 1,500 to 3,000 watts and a U.S. average rate of about $0.14 per kilowatt-hour.
If you're considering installing an infrared sauna at home, the question of electricity cost is probably sitting in the back of your mind. Fair concern. You want the health benefits—better circulation, muscle recovery, stress reduction—without a surprise utility bill showing up six months later.
The short answer: a typical home infrared sauna uses between 1,500 and 3,000 watts per session. For a person using it 4 times a week, that works out to roughly $100 to $250 per year in electricity, depending on your local rates and how long you stay in.
Here's how to calculate it for your specific setup, step by step.
What determines an infrared sauna's electricity draw
Infrared saunas heat differently than traditional Finnish saunas. Instead of heating the air around you, infrared panels emit radiant heat that warms your body directly. This means they run at lower temperatures (usually 120°F to 150°F) and use less electricity per session than a steam room or dry sauna that needs to hit 180°F or higher.
The main factors that affect your sauna's electricity usage:
- Heater wattage. Most home infrared saunas range from 1,500 watts (small, 1-person units) to 3,000 watts (2- to 3-person units). Commercial or larger units can go higher, but for a home setup, 1,800 to 2,400 watts is the sweet spot.
- Session length. A typical session runs 20 to 45 minutes. The longer you stay, the more power you use. Most research on sauna benefits uses 15- to 20-minute sessions, but many men extend to 30 or 40 minutes for deeper relaxation or recovery.
- Frequency of use. Four times per week is common among regular sauna users. Some men use it daily. The Finnish study on cardiovascular benefits (Laukkanen et al., 2015) found the strongest effects at 4 to 7 sessions per week.
- Preheat time. Infrared saunas warm up faster than traditional saunas—usually 10 to 15 minutes—but you still pay for that warm-up. Some units have timers or smart controls that let you schedule preheat so it's ready when you walk in.
- Ambient room temperature. If your sauna is in a cold garage or basement, it takes more energy to reach temperature. A well-insulated room or a sauna with proper insulation reduces this effect.
The formula for estimating yearly cost
Here's the math you need. Grab your sauna's wattage and your local electricity rate (find it on your utility bill, measured in cents per kilowatt-hour, or kWh).
- Convert watts to kilowatts. Divide your sauna's wattage by 1,000. Example: 2,000 watts ÷ 1,000 = 2.0 kW.
- Multiply by session hours. Convert your session length to hours. 30 minutes = 0.5 hours. 2.0 kW × 0.5 hours = 1.0 kWh per session.
- Multiply by sessions per week, then by 52 weeks. 1.0 kWh × 4 sessions per week = 4.0 kWh per week. 4.0 kWh × 52 weeks = 208 kWh per year.
- Multiply by your electricity rate. The U.S. average is about $0.14 per kWh. 208 kWh × $0.14 = $29.12 per year.
That's the baseline. But most people don't factor in preheat time. Add 10 minutes of preheat (0.17 hours) per session: 2.0 kW × 0.17 hours = 0.34 kWh per session. Over a year at 4 sessions per week, that's an extra $12.37. Total: about $41.50 per year.
Real-world examples
Example A: Small 1-person sauna, occasional use
- Wattage: 1,500 watts (1.5 kW)
- Session: 20 minutes (0.33 hours)
- Frequency: 3 times per week
- Rate: $0.12/kWh
- Yearly cost: 1.5 × 0.33 × 3 × 52 × 0.12 = $9.26
Example B: Mid-size 2-person sauna, regular use
- Wattage: 2,400 watts (2.4 kW)
- Session: 30 minutes (0.5 hours)
- Frequency: 5 times per week
- Rate: $0.14/kWh
- Yearly cost: 2.4 × 0.5 × 5 × 52 × 0.14 = $43.68
Example C: Larger 3-person sauna, daily use
- Wattage: 3,000 watts (3.0 kW)
- Session: 40 minutes (0.67 hours)
- Frequency: 7 times per week
- Rate: $0.18/kWh
- Yearly cost: 3.0 × 0.67 × 7 × 52 × 0.18 = $131.58
How to reduce electricity usage without cutting sessions
You don't have to give up sauna time to keep costs low. A few practical adjustments:
- Use a timer or smart plug. Set it to preheat only when you're about to step in. Avoid leaving it on for hours.
- Insulate the room. If your sauna is in an unconditioned space, adding insulation to walls or using a thermal blanket over the unit during warm-up reduces heat loss.
- Shorten warm-up. Some infrared saunas reach temperature in 10 minutes. Test yours. If it's ready at 8 minutes, don't wait the full 15.
- Combine sessions. If you and a partner or friend both use the sauna, running one session together uses the same electricity as one solo session.
- Check your sauna's efficiency. Newer models with carbon or ceramic infrared panels tend to heat faster and more evenly than older quartz models. If you're shopping, look for units with low standby power draw and good insulation ratings.
What about standby power?
Most infrared saunas draw a small amount of power even when turned off—typically 1 to 5 watts for the control panel or digital display. Over a year, that's about $1 to $5. Not worth worrying about, but if you want to eliminate it, unplug the unit between uses.
Is it worth the cost?
Compare $40 to $130 per year to what you'd pay for a gym membership with sauna access, or a spa visit. A single monthly gym membership often runs $40 to $60. A spa sauna session can cost $20 to $50. Even the highest estimate here is less than three spa visits.
The health research backs the investment. Regular sauna use has been linked to improved cardiovascular function, reduced inflammation, better sleep quality, and lower all-cause mortality in longitudinal studies. Those outcomes don't show up on a utility bill, but they matter more than the dollars spent.
Final number to remember
For most men using a home infrared sauna 4 times per week for 30 minutes, the yearly electricity cost falls between $30 and $80. That's roughly the price of a decent dinner out—for a year of heat therapy.
If you want a precise estimate for your setup, plug your numbers into the formula above. It takes two minutes and gives you a number you can trust. No guesswork, no surprises.
Frequently asked questions
How many watts does a home infrared sauna use?
Most home infrared saunas range from 1,500 watts for small one-person units up to 3,000 watts for two- to three-person units. For a typical home setup, 1,800 to 2,400 watts is the common range. Larger commercial units can draw more power.
How do I calculate my infrared sauna's yearly electricity cost?
Divide your sauna's wattage by 1,000 to get kilowatts, multiply by your session length in hours, then multiply by sessions per week and by 52 weeks to get annual kilowatt-hours. Finally, multiply that figure by your local electricity rate, which you can find on your utility bill. Don't forget to factor in preheat time, which typically adds 10 to 15 minutes per session.
Does infrared sauna preheat time add much to the electricity bill?
It does add a noticeable amount over a year. Using the article's worked example, preheat time added roughly $12 per year on top of the baseline session cost for someone using a 2,000-watt sauna four times a week. Using a timer or smart plug to avoid unnecessary warm-up time can help keep that figure down.
How can I reduce my infrared sauna's electricity usage without skipping sessions?
You can use a timer so the sauna only preheats right before you step in, insulate the room to reduce heat loss, and test whether your unit reaches temperature earlier than the default warm-up estimate. Sharing a session with a partner is another practical option, since two people using one session draws the same electricity as a solo session.