How Much Does It Cost to Run a Sauna Every Month

At Northern Lights Cedar Barrel Saunas, we get asked about running cost every week, so here is the plain answer. Most home saunas cost roughly 30 cents to a bit over a dollar per session in electricity, which lands most owners between about 7 and 35 dollars a month depending on the heater and how often they bathe. Below we show the formula and the real numbers.

How do I calculate the cost to run my sauna

The cost to run a sauna comes down to one honest formula. You take your heater power in kilowatts, multiply by the hours it actually draws power during a session, multiply by your electricity rate, then multiply by how many sessions you do in a month. The number people get wrong is the hours, because a traditional heater does not pull full power the whole time. It runs hard to reach temperature, then the thermostat cycles the elements on and off. We treat that as effective full-power hours, which for a well-built barrel is usually less than an hour even when you sit longer.

We used a sample rate of 18 cents per kilowatt-hour, close to the U.S. residential average of 18.34 cents in mid 2026 shown in the EIA residential electricity price data. Your own rate varies quite a bit by state, so drop your number in where ours sits.

Run that 6 kW barrel twelve times a month and you are looking at under 10 dollars, roughly the price of one takeout coffee a week.

How much power does a sauna heater actually use

A sauna heater uses far less power over a month than its nameplate suggests, because it only runs hard while the room is climbing to temperature. Traditional electric heaters for home saunas usually run from about 4.5 kW for a compact two person barrel up to 8 or 9 kW for a larger cabin, and you size the heater to the heated air volume, not the seat count alone. Our sauna heater sizing chart and our guide on what size sauna heater you need walk through that math. Infrared cabins sit far lower, often 1.5 to 2.5 kW total across the panels, because they warm your body directly instead of heating a big volume of air.

Here is something you only learn from building these. In the barrels we build, the round shape holds less dead air than a boxy cabin with the same number of seats, so the same 6 kW heater reaches temperature faster and starts cycling sooner, and that earlier cycling is money you never spend. A clear cedar barrel we ship is typically sit-ready in about 30 to 40 minutes, where a poorly insulated square room can still be climbing at the hour mark and burning full power the whole way. If you are weighing heater types, our rundown of the benefits of electric sauna heaters covers why most owners land on electric.

What does it cost to run a sauna a few times a week

For most families this is the real question, because almost nobody runs a sauna daily at the start. Using the sample rate above, here is what a month looks like across the common heater types at a few realistic frequencies.

Wood-fired is the odd one out. It uses no electricity for heat, so its running cost is firewood, usually a couple of dollars in split hardwood per session. If you love the ritual and have a wood source, it can be the cheapest heat of all, which is part of why we still build so many. Our look at which sauna heater is best among electric, wood, and propane compares them fairly, and our guide on how often you should use a sauna helps you land on a realistic frequency.

Does an infrared sauna cost less to run than a traditional electric one

Yes, an infrared sauna almost always costs less per session to run than a traditional electric sauna, and the table shows why. Infrared panels draw a fraction of the power, and you sit in them while they warm, so there is no long empty pre-heat burning full kilowatts. A typical infrared session lands under 30 cents where a traditional barrel session lands near a dollar. The trade is the experience. Infrared runs cooler and drier and does not give you the steam or the deep enveloping heat of a traditional stove. We lay out the differences in our comparison of infrared versus electric saunas and in our breakdown of what an infrared sauna costs.

Is a sauna expensive to run compared with everyday appliances

A sauna is not an expensive appliance to run, and that surprises most people. A traditional barrel used a few times a week costs about the same each month as running a second refrigerator or a modest amount of air conditioning. The heater draws a lot while it is on, but it is only on for an hour or so at a time. Set against the reasons people bathe, including the cardiovascular gains documented in a randomized controlled trial on sauna bathing and cardiovascular function, the monthly electricity is usually the smallest part of ownership. We cover the fuller picture in our honest look at whether a home sauna is worth it and in our roundup of the benefits of regular sauna use.

What makes one sauna cost more to run than another

The biggest lever is not the heater badge, it is how much heated air the room holds and how well it keeps that heat. A larger sauna with more air volume needs a bigger heater and more energy per session, so size honestly for how many people actually bathe rather than buying the largest room you can fit. Our guide to how much a barrel sauna costs and our sauna pricing page show where the sizes actually land.

The wood matters more than most buyers expect. We use clear Western red cedar with a full stave thickness on the barrels we build, and that wall does more for your monthly bill than any thermostat setting, because thicker, tighter, low-conductivity cedar holds heat and cuts the heater’s run time. It is a big reason we favor clear cedar over knotty, as we explain in clear cedar versus knotty cedar.

The most expensive mistake we see has nothing to do with the heater itself. It is an electric heater fed by an undersized circuit or a long, thin wire run. A 6 kW heater is a continuous load, so NEC Article 424, which covers fixed electric space-heating equipment in NFPA 70, has your electrician size the circuit at 125 percent of the heater draw. Skimping there does not lower your bill, it trips breakers and cooks connections. Get the pad prepped level and the circuit right the first time, which we walk through in our guide to sauna electrical requirements.

Once you know your heater size and your local rate, the monthly number is easy to trust, and it is almost always smaller than people fear. When you are ready to match a room to a heater and a circuit, browse our cedar barrel sauna kits or check current numbers on our sauna pricing page, or call us at Northern Lights Cedar Barrel Saunas at 1-800-759-8990 and we will confirm the heater and the circuit for your build.

Frequently asked questions

How much does it cost to heat a sauna from cold

Heating a sauna from cold is the priciest part of any session, because the heater pulls full power until the room reaches temperature. In a well-built barrel that warm-up takes about 30 to 40 minutes and uses roughly 3 to 4 kilowatt-hours, under a dollar at a sample rate near 18 cents before you ever sit down.

Is it cheaper to run a sauna in winter or summer

Running a sauna is slightly cheaper in summer, though the difference is smaller than most people think. In winter the heater fights colder incoming air and a colder slab, so warm-up takes a little longer and costs a bit more, especially for an outdoor sauna. Good insulation and a covered, wind-sheltered spot flatten most of that seasonal gap.

Does a bigger sauna always cost more to run

A bigger sauna almost always costs more to run, because more heated air volume needs a larger heater and more energy to reach and hold temperature. The jump from a two person barrel to a six person cabin shows up clearly on your bill. Sizing the room to how many people actually bathe is the cheapest decision you make.

How much does a wood-fired sauna cost to run per session

A wood-fired sauna costs nothing in electricity, so its running cost is firewood, usually about 2 to 4 dollars in split hardwood per session depending on your wood source and how long you fire it. If you cut or source your own wood cheaply, a wood-fired barrel can be the least expensive sauna to run of any type.

Can I run a 6 kW sauna heater on a normal household outlet

A 6 kW sauna heater cannot run on a normal 120 volt household outlet. It needs its own 240 volt circuit sized to code for a continuous load, which usually means a dedicated breaker and heavier wire installed by a licensed electrician. Only small infrared or plug-in units run on a standard outlet, and even those prefer a dedicated circuit.

Do infrared saunas save money over time

Infrared saunas do save money on running cost over time, since they draw far less power per session than a traditional electric sauna and skip the long empty pre-heat. Over a year of regular use the electricity savings add up. Whether that offsets the different experience is a personal call, since infrared heat feels milder than a traditional stove.

How many kilowatt hours does one sauna session use

One sauna session uses roughly 4 to 7 kilowatt-hours for a traditional electric barrel or cabin, and closer to 1.5 to 2 kilowatt-hours for an infrared cabin. The exact figure depends on heater size, how well the room is insulated, and how long you run it, which is why our formula uses effective full-power hours rather than clock time.

Will running a sauna every day spike my electric bill

Running a sauna every day will raise your electric bill, but rarely by as much as people expect. A daily traditional barrel adds roughly 25 to 35 dollars a month at a sample rate near 18 cents, while a daily infrared session adds under 10 dollars. Your own utility rate, which varies widely by state, moves that number the most.