For most men using a home sauna three to five times per week, monthly energy costs typically run between $10 and $40, depending on heater type, local electricity rates, and how carefully you manage preheat time.
Let's cut through the marketing fluff. If you're thinking about installing a home sauna—or you already have one and want to know what it's actually costing you—the monthly energy bill is probably the first practical question. The short answer: for most men using a sauna 3–5 times per week, you're looking at $10 to $40 per month, depending on your setup, local electricity rates, and how you use it.
But that range is wide for a reason. Let's break it down so you can run the numbers for your specific situation.
What drives the cost: heater type and power draw
The biggest variable is your sauna heater. There are three common types, and each has a different energy profile.
Electric resistance heaters (most common in home saunas)
These are the standard in infrared and traditional Finnish-style saunas. They range from 4.5 kW to 9 kW for a typical 4–6 person unit. A 6 kW heater running for 45 minutes uses about 4.5 kWh per session. At the U.S. average electricity rate of $0.14 per kWh (2024 data from the EIA), that's about $0.63 per session. Four sessions a week comes to roughly $10 per month.
Infrared saunas (lower wattage, longer sessions)
Infrared heaters typically draw 1.5–3 kW because they heat your body directly rather than the air. A 2 kW unit running for 40 minutes uses about 1.3 kWh per session. Same frequency—$0.18 per session, or about $3 per month. But infrared sessions often last longer (45–60 minutes), so adjust accordingly.
Wood-burning saunas (no electricity for heat, but indirect costs)
These use firewood. A typical session burns 3–5 logs, costing roughly $1–$2 per session depending on your local wood prices. No electric bill impact, but you'll need to factor in chimney maintenance and the physical labor of splitting and stacking.
Real-world example: A friend in Colorado runs a 6 kW electric sauna 4 times a week. His monthly increase on the electric bill is consistently $12–$15. That's less than a single dinner out.
Hidden factors that inflate the bill
Three things most people overlook can double your monthly cost.
1. Preheating time
Electric saunas take 30–60 minutes to reach temp. If you leave it on for an hour before you step in, you're paying for that idle time. A 6 kW heater running for 60 minutes of preheat plus 45 minutes of use = 10.5 kWh per session. That's $1.47 per session instead of $0.63. Over a month, that's the difference between $10 and $25.
Solution: Use a timer or smart plug. Set it to start 30 minutes before your planned session, not 60.
2. Insulation quality
A poorly insulated sauna loses heat fast. The heater has to run longer to maintain temperature. A well-insulated unit with reflective foil and proper vapor barrier can cut energy use by 20–30%. If your sauna is in an unheated garage or outdoors, this matters even more.
3. Local electricity rates
Rates vary wildly. Hawaii averages $0.44/kWh. Louisiana is $0.11/kWh. If you're in a high-rate state, your monthly cost could be triple what a neighbor in a low-rate state pays. Check your utility bill for the exact rate per kWh.
How to estimate your own monthly cost
Here's a simple formula. Grab a calculator or your phone.
- Find your heater's wattage (look on the spec plate or manual). Divide by 1,000 to get kilowatts.
- Multiply by the average session length in hours (e.g., 0.75 for 45 minutes).
- Multiply by your local electricity rate per kWh (check your latest bill).
- Multiply by how many sessions you do per month.
Example: 6 kW heater × 0.75 hours = 4.5 kWh per session. × $0.14/kWh = $0.63. × 16 sessions per month = $10.08.
If you want a more precise number, include preheat time in step 2. But most guys find the actual increase on their bill matches this math within a dollar or two.
Does sauna frequency change the math?
Yes, but not as much as you'd think. Finnish research on sauna frequency (Laukkanen et al., 2015, JAMA Internal Medicine) found that men who sauna 4–7 times per week had a 40% lower risk of cardiovascular death compared to once-weekly users. The dose-response relationship was clear: more sessions, better outcomes.
So if you're going 5 times a week instead of 3, your monthly cost goes up by about 60%. But the health return on that $5–$10 increase is substantial. Reduced inflammation, improved blood flow, better sleep—those aren't line items on your electric bill, but they're worth considering.
Practical takeaways
- If you're shopping for a sauna: Look for units with good insulation and a heater size matched to the room volume. Oversizing the heater wastes energy. Undersizing means longer preheat times.
- If you already own one: Use a timer. Preheat for 30 minutes, not 60. And if your sessions are running long, consider infrared—it uses less power and you can stay in longer without overheating.
- If you're on a budget: Wood-fired saunas have higher upfront cost but lower monthly operating expenses if you source your own wood. Electric is the easiest to install and cheapest to run per session if you're disciplined about preheat time.
One last thing
The monthly cost of running a home sauna is small compared to what you're likely spending on coffee, takeout, or streaming subscriptions. A $15 monthly electric bill for 12–16 sessions is about $1 per session. That's less than a single protein bar.
And the research is clear: regular sauna use supports cardiovascular health, reduces stress, and may improve recovery from exercise. If you're already investing in your health through gym memberships, supplements, or better food, a sauna is one of the cheapest interventions you can add.
Bottom line: For most men, a home sauna costs between $10 and $40 per month in electricity. That's a small price for something that moves the needle on your health. If you're on the fence, run your numbers. They're probably lower than you think.
Frequently asked questions
How much does it cost to run an electric sauna per month?
A standard electric resistance heater running four sessions a week at the U.S. average electricity rate works out to roughly $10 per month at the low end. If you leave the heater running for a full hour of preheat rather than 30 minutes, that monthly figure can climb closer to $25. Using a timer to keep preheat time short is the easiest way to stay near the lower end of that range.
Are infrared saunas cheaper to run than traditional electric saunas?
Yes, infrared saunas draw less power because they heat your body directly rather than heating the air around you. At the same usage frequency, an infrared unit can cost around $3 per month compared to roughly $10 for a traditional electric model. Keep in mind that infrared sessions often run longer, so your actual cost depends on how long you stay in.
What hidden factors can make my sauna electricity bill higher than expected?
The three most common culprits are long preheat times, poor insulation, and high local electricity rates. A poorly insulated sauna loses heat quickly and forces the heater to work harder to hold temperature. Local rates vary considerably across the country, so checking your own utility bill for the exact rate per kilowatt-hour gives you the most accurate picture.
Does using a sauna more often significantly increase my monthly costs?
Going from three sessions a week to five raises your monthly cost by roughly 60%, but in dollar terms that difference is relatively small. The Laukkanen et al. 2015 study published in JAMA Internal Medicine found a clear dose-response relationship between sauna frequency and cardiovascular outcomes, suggesting the added health benefit may well justify the modest increase in your electric bill.