Last updated 2026-07-10

What is an infrared sauna and how does it differ from a traditional sauna?

A traditional sauna heats the air around you to somewhere between 150°F and 195°F (65°C to 90°C), and you sweat because you're sitting inside a very hot room. An infrared sauna works differently. It uses infrared light, a slice of the electromagnetic spectrum just below visible red, to warm your body directly instead of heating the surrounding air first ^[1]. The cabin usually sits between 120°F and 150°F, which most people find easier to take.

There are three bands of infrared used in commercial and home saunas: near-infrared (NIR), mid-infrared (MIR), and far-infrared (FIR). Most consumer units use far-infrared because FIR panels are cheap, efficient, and reach a few centimeters into skin and soft tissue. Near-infrared runs at a shorter wavelength and has been studied on its own, mostly for wound healing and photobiomodulation. Some saunas sell themselves as "full-spectrum" and pack in all three, though the independent evidence that the combination beats FIR alone is thin.

Want a broader map of how sauna types stack up? The sauna vs steam room and sauna guides cover the structural differences in more depth.

What does the research say about infrared sauna health benefits?

The honest answer: there's real research, but it's mostly small studies, often without control groups, from a handful of teams in Finland and Japan. That doesn't make the findings wrong. It means you hold them loosely instead of treating them as settled science.

The strongest signal is cardiovascular. A 2018 review in Mayo Clinic Proceedings drew on a long-running Finnish cohort of more than 2,300 men and found that frequent sauna use (4 to 7 sessions per week) tracked with a 50% lower risk of fatal cardiovascular disease compared to once-weekly bathers ^[2]. That study used traditional Finnish saunas, not infrared, so the direct translation is uncertain. But it set up the biological case for heat exposure shaping heart outcomes, and smaller infrared-specific trials since then point the same direction.

A 2009 clinical study in the Journal of Cardiac Failure followed 129 chronic heart failure patients who got 15-minute far-infrared sessions five days a week for three weeks. The team reported gains in exercise tolerance, left ventricular ejection fraction, and quality-of-life scores against controls who rested in a 73°F room ^[3]. These were sick patients under supervision, not healthy people running a home unit, so the carryover to everyday use is imperfect. It's still among the more rigorous infrared-specific heart trials on the books.

For pain and muscle recovery, the evidence is thinner but points the same way. A small 2008 randomized trial found that people with chronic low-back pain who used far-infrared sauna sessions reported statistically significant drops in pain and disability against a control group ^[4]. Sample sizes in this corner of research usually sit under 50, which caps how far you can generalize.

Relaxation and mood are harder to measure but plausible. Heat stress triggers a parasympathetic rebound once the session ends, and infrared use has been linked to lower cortisol in a few small studies. The mechanism lines up with what we know about thermal physiology.

For a fuller breakdown of what sauna heat does to the body, the sauna benefits article walks through the physiology.

Are infrared saunas safe for most people?

For healthy adults who aren't pregnant, don't have unstable cardiovascular disease, and aren't on medications that mess with sweating or blood pressure, infrared saunas are considered safe at normal session lengths of 15 to 30 minutes ^[5].

The main risks are dehydration and overheating. Infrared saunas make you sweat, and they mean it. A 20-minute session can pull 0.5 to 1 liter of sweat out of you, so drinking water before and after isn't optional. The lower air temperature can lull you into a false sense of safety, and people who stop paying attention push sessions too long and get into trouble.

Heat exhaustion and heat stroke are real, if rare, outcomes from any sauna overuse. Watch for nausea, dizziness, confusion, and the big one: you stop sweating but still feel hot. If any of that shows up, get out, cool down, and drink water. Seek medical help if it doesn't clear fast.

The American College of Cardiology has said patients with known cardiovascular disease should talk to a physician before using any sauna, because the hemodynamic swings from heat stress, including blood pressure drops and higher heart rate, can be meaningful ^[5]. That guidance covers infrared too.

Who should not use an infrared sauna?

Some groups genuinely need to be careful or steer clear entirely.

Pregnancy is the clearest contraindication. Core temperature above 101°F (38.3°C) in the first trimester has been linked to a higher risk of neural tube defects ^[6]. The FDA has flagged elevated core temperature as a pregnancy risk regardless of the heat source ^[6]. Don't use an infrared sauna if you're pregnant, or at the very least have a direct conversation with your OB first.

People with multiple sclerosis often have heat sensitivity, where symptoms temporarily worsen as body temperature climbs. It's called Uhthoff's phenomenon and it's well documented. It doesn't cause permanent damage, but the flare can be alarming and disabling while it lasts.

Anyone on medications that blunt sweating, like anticholinergics, or that lower blood pressure, like diuretics or alpha-blockers, carries a higher risk of heat-related trouble. Alcohol before a sauna is genuinely dangerous. A Finnish study found that about 1.8% of sauna-related deaths in Finland involved alcohol ^[7]. That figure is specific to traditional Finnish saunas, but the physiology applies to infrared just the same.

People with implanted electronic devices like pacemakers or defibrillators should check with their cardiologist. The electromagnetic field from infrared panels is weak and unlikely to interfere at normal sitting distances, but this isn't a thing to guess about.

Do infrared saunas help with weight loss?

This is the claim that gets the most hype and earns the most skepticism.

You'll sweat out water weight during a session. A 20 to 30-minute session near 140°F can produce 300 to 800 mL of sweat, and that fluid loss shows on a scale for a while. Then it comes right back the moment you rehydrate, which you should do anyway.

The calorie-burn argument is murkier. Heart rate does rise during infrared use, often into the 100 to 150 beats per minute range, which lifts metabolic demand above rest. A number that gets passed around says a 30-minute session might burn 200 to 600 calories, but those figures circulate without solid sourcing and swing wildly by body size, cabin temperature, and individual physiology. Rigorous data on caloric burn from infrared sessions is sparse.

Nobody has good data showing that regular infrared sauna use drives meaningful long-term fat loss on its own, apart from diet and exercise. It's a reasonable add-on to a life that already has those in it. Treating a sauna as a weight-loss machine oversells it badly.

Can infrared saunas help with pain and inflammation?

This is one of the better-supported uses, even with room for the evidence to grow.

The 2008 randomized trial on chronic low-back pain found that patients who finished an eight-week course of infrared sessions combined with supervised exercise reported better pain scores than the exercise-only group ^[4]. The authors credited direct heat to painful tissue, more circulation, and looser muscle guarding.

Fibromyalgia is another spot where small trials show benefit. A 2008 study in Internal Medicine found that fibromyalgia patients using far-infrared therapy alongside other treatments reported less pain and fatigue than at baseline ^[8]. Small sample again, and the combination design makes it hard to say how much the sauna itself did.

Rheumatoid arthritis and ankylosing spondylitis studies exist, and they're just as small and short. The direction stays positive for pain and stiffness, which is encouraging, but no major rheumatology body endorses infrared sauna therapy as a standalone treatment.

For athletes chasing recovery, the mechanism most cited is better circulation plus heat shock protein activation. Heat shock proteins (HSPs) help cells repair damaged proteins, and heat stress ramps them up. Animal models and some human studies back the pathway, though how it converts to specific sport recovery numbers is still an open question.

How do infrared saunas compare to traditional saunas on health outcomes?

The largest and most rigorous long-term data we have, the Finnish cohort work included, comes from traditional high-temperature saunas, not infrared. That's simply because Finland has decades of population data on sauna habits and health, and traditional Finnish saunas are what those people used.

Infrared saunas do produce measurable cardiovascular responses: higher heart rate, higher cardiac output, peripheral vasodilation, and blood pressure shifts. The core temperature rise runs smaller than in a traditional sauna at the same duration, which matters for both the therapeutic signal and the safety margin. Some practitioners argue you need longer or more frequent infrared sessions to match a traditional sauna's cardiovascular kick. Others argue the lower-temperature penetration profile is its own meaningful difference that could produce different outcomes.

Here's the honest summary.

Neither type is objectively better. Traditional saunas have the research depth. Infrared saunas win on convenience for home use, and most of the infrared evidence that exists points toward benefit.

What about EMF exposure from infrared saunas? Is it a real concern?

EMF (electromagnetic field) worries around infrared saunas come up constantly in marketing and forum chatter. Short answer: the risk is almost certainly very low at the field strengths these panels put out. The longer answer has some nuance.

The infrared heaters emit non-ionizing radiation, the same category as radio waves from your phone and light from the sun. Non-ionizing radiation at low intensity doesn't break chemical bonds or damage DNA the way X-rays and gamma rays do ^[1]. FIR panels run in the 8 to 14 micrometer wavelength range, far below the frequencies tied to cellular damage.

The real concern people raise is the magnetic field from the AC current running through the heater panels, which is a separate thing from the infrared itself. Some makers advertise "low EMF" or "ultra-low EMF" panels and quote milligauss readings to show they clear voluntary limits like those from the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The ICNIRP general-public guideline for power-frequency magnetic fields (50/60 Hz) is 2,000 milligauss ^[9]. Most panels, even standard ones, sit well under that at normal sitting distance.

EMF isn't a fraudulent concern, but the "low EMF" marketing has raced ahead of any evidence that standard sauna-level exposure actually hurts you. When you compare models, don't let EMF spec differences drive the decision unless one unit has unusually high published readings.

How often should you use an infrared sauna to get benefits?

The Finnish cardiovascular data points to a dose-response pattern: more frequent sessions correlate with better outcomes, with the 4 to 7 sessions per week group in the Laukkanen cohort showing the strongest associations ^[2]. Translating that straight to infrared use for a generally healthy person is imprecise.

Most infrared studies that showed positive results used three to five sessions a week, 15 to 30 minutes each. That's a fair target for someone building a habit.

For most healthy adults, starting with two to three sessions a week at 20 minutes and building up as tolerated makes sense. There's no established "too much" line for healthy people with no contraindications, but daily use without enough water and rest is where problems stack up.

Post-exercise is a popular slot, and there's mechanistic logic: the cardiovascular system is already primed, muscle tissue is warm, and the relaxation that follows can help recovery. Pairing a sauna with a cold plunge afterward, sometimes called contrast therapy, has its own growing following. The cold plunge benefits article covers what cold exposure adds to the picture.

What should you look for in a home infrared sauna?

If you're shopping for a home unit, a few things actually matter and a lot of the spec talk is noise.

Heater type beats marketing phrases. Carbon fiber and carbon crystal panels dominate mid-range and premium units. Carbon panels spread a broader, more even heat than ceramic rod heaters, which run hotter and more localized. Either works, but carbon panels tend to feel better over a longer session.

Size affects more than footprint. A one-person unit is compact but boxes in your range of motion, and most regular users say they wish they'd gone one size up. Two-person units cost more, roughly $2,000 to $5,000 for a quality home unit against $1,000 to $2,500 for single-person models, depending on brand and features ^[10].

Electrical requirements matter before you buy. Most residential infrared saunas in the US run on standard 120V outlets (15 or 20 amps), which keeps installation easy. Larger units may need a 240V circuit. Check before you order.

Wood type is mostly aesthetic. Hemlock, cedar, and basswood are the common choices and all work fine. Some people react to cedar oils; basswood and hemlock are lower-allergen alternatives.

SweatDecks carries home infrared options across size and price points, and the home sauna guide walks through what a realistic installation actually takes if you're still deciding.

Are infrared saunas worth it compared to other recovery tools?

This is the question worth asking honestly before you spend $1,500 to $5,000.

An infrared sauna is a fairly passive recovery and wellness tool. It won't build strength, raise VO2max on its own, or stand in for sleep. What it does reliably is lower subjective stress and muscle soreness in most people who use it regularly, and the cardiovascular association data is encouraging even though it can't prove causation yet.

For contrast therapy fans, a cold plunge paired with a sauna feels nothing like either one alone. The back-and-forth vasodilation and vasoconstriction, the endorphin hit, and the pure novelty of hot-cold cycling are why serious athletes keep coming back to it. If you want to go that way, the cold plunge and ice bath articles cover the cold side.

If budget is tight, a portable sauna is a legitimate entry point. It won't replicate the full-cabin experience and the heat spreads less evenly, but it can get you into the practice for a few hundred dollars while you figure out whether regular infrared use is something you'll stick with.

My honest take: if you already train consistently and sleep well, a home infrared sauna is a genuinely pleasant addition with a real, if modest, health signal behind it. If you're counting on it to do the heavy lifting for your health, you'll be let down.

Frequently asked questions

Is it safe to use an infrared sauna every day?

For healthy adults who stay well hydrated, daily infrared sauna use looks safe based on current evidence. The Finnish data on traditional sauna users who bathed 4 to 7 times a week showed favorable health associations, not harm. Daily use without enough water raises dehydration risk. Start with 3 to 4 sessions a week and build from there. Dizziness, nausea, or lightheadedness is your cue to shorten sessions or cut frequency.

Can infrared saunas help with high blood pressure?

Some small studies show modest, temporary drops in blood pressure after infrared sessions, likely from peripheral vasodilation. A 2012 study in the Journal of Human Hypertension linked regular sauna use with lower resting blood pressure in hypertensive patients. The effect was real but not big enough to replace medication. If you have hypertension, talk to your doctor before starting, since the blood pressure swings during a session can also be abrupt.

Do infrared saunas actually detox your body?

Your liver and kidneys handle real detoxification. Sweat carries small amounts of heavy metals like lead and cadmium, and a 2011 review in the Journal of Environmental and Public Health found sweating can help clear some environmental compounds. But sweat isn't a primary detox organ, and the quantities are modest. The detox claim on infrared saunas is mostly marketing. The real benefits come through cardiovascular and relaxation pathways, not toxin removal.

How long should a beginner infrared sauna session be?

Start at 10 to 15 minutes near 120°F for your first few sessions. Your body needs time to adapt to heat stress, and the lower air temperature can hide how fast your core is climbing. Drink 16 to 24 ounces of water beforehand. Once you're comfortable, most people settle into 20 to 30-minute sessions. Don't start a session already dehydrated or right after a big meal.

Are infrared saunas good for skin?

More circulation from heat stress can give skin a temporary flushed, fuller look. Sweating clears surface debris and can ease congested pores. Some photobiomodulation research on near-infrared wavelengths points to collagen-stimulating pathways, though most consumer far-infrared saunas don't run at those wavelengths. The skin benefits are real but modest. If you use topical retinoids or have rosacea, check with a dermatologist, since heat can worsen both.

Can infrared saunas help with anxiety or depression?

A 2016 randomized controlled trial in JAMA Psychiatry found that a single session of whole-body hyperthermia (raising core temperature to 101.3°F) significantly cut depression scores versus sham, with effects lasting six weeks. Infrared saunas produce a milder core temperature rise, so the translation is uncertain. The relaxation and mood lift many people feel after sessions are real, but infrared saunas shouldn't replace clinical treatment for diagnosed depression or anxiety.

What temperature should an infrared sauna be set at?

Most people find 120°F to 140°F (49°C to 60°C) comfortable and effective. Unlike traditional saunas, where hotter is often the goal, infrared penetration stays fairly consistent across the usual range because the effect comes from the wavelengths more than from air temperature. Lower temperatures suit longer sessions; higher ones need shorter duration and more attention to hydration. Research hasn't pinned down a specific optimal temperature.

Is there a difference between near-infrared and far-infrared saunas for health?

Far-infrared (FIR) saunas are what most clinical studies used, and FIR wavelengths (8 to 14 micrometers) get absorbed well by skin and soft tissue. Near-infrared (NIR) shows up more in photobiomodulation and wound-healing research, often with targeted panels rather than full sauna environments. Full-spectrum saunas include both, but the evidence that the combination beats FIR alone in a sauna isn't established. FIR-only is fine for the health goals most people care about.

Can you use an infrared sauna if you have heart disease?

Some cardiac patients have used far-infrared saunas in supervised clinical settings with positive results, including the 2009 Journal of Cardiac Failure trial in chronic heart failure patients. Heat stress does raise heart rate and shift blood pressure in ways that can matter for people with unstable angina, a recent heart attack, or severe valve disease. The American College of Cardiology advises consulting a cardiologist before any sauna use if you have known cardiovascular disease. Don't self-prescribe this one.

Do infrared saunas help with muscle recovery after exercise?

The evidence is preliminary but plausible. Heat exposure boosts blood flow to muscles, may reduce delayed-onset muscle soreness (DOMS), and triggers heat shock protein production that supports cellular repair. A few small studies showed lower perceived soreness in athletes who used post-exercise heat. The effect size is modest and the research base is small. Used consistently alongside sleep, nutrition, and load management, a post-workout infrared session is a reasonable addition.

How much does a home infrared sauna cost to run per month?

A typical one to two-person infrared sauna draws 1,500 to 2,000 watts. Run it 30 minutes per session, five times a week, and you're at roughly 15 to 20 kWh a month. At the US average electricity rate of about $0.16 per kWh as of 2024, that's roughly $2.40 to $3.20 a month. Even daily use rarely pushes monthly operating cost past $10 to $15, so running cost is close to negligible.

Are infrared saunas safe during pregnancy?

Infrared saunas aren't recommended during pregnancy. Raising core body temperature above 101°F in the first trimester is linked to a higher risk of neural tube defects, and the FDA has flagged this risk from heat exposure generally. Infrared saunas do raise core temperature, and the lower air temperature makes it harder to notice how hot you're getting. Most midwives and OBs advise skipping hot tubs, traditional saunas, and infrared saunas throughout pregnancy.

How do I know if an infrared sauna is a legitimate brand vs. a cheap knockoff?

Look for saunas that publish third-party heater EMF test results, use kiln-dried solid wood (not MDF or pressed board), and carry ETL or UL safety listing for the electrical components. Warranty length tells you a lot: reputable brands offer 5 to 10 year coverage on heaters and panels. Skip units whose only documentation is a single-page PDF with no contact address. Price alone isn't reliable, but full-size cabins under $600 almost always cut corners on heater quality or wood.

Sources

1. NASA Science, 'Introduction to the Electromagnetic Spectrum': Infrared light is the portion of the electromagnetic spectrum just below visible red light; FIR wavelengths are 8-14 micrometers
2. Mayo Clinic Proceedings, Laukkanen et al. 2018, 'Sauna Bathing Is Associated with Reduced Cardiovascular Mortality': Finnish cohort study of 2,300+ men found 4-7 sauna sessions per week associated with 50% lower risk of fatal cardiovascular disease vs once-weekly
3. Journal of Cardiac Failure, Kihara et al. 2009, 'Repeated Sauna Treatment Improves Vascular Endothelial and Cardiac Function in Patients with Chronic Heart Failure': 129 chronic heart failure patients using 15-min FIR sauna sessions 5x/week for 3 weeks showed improved ejection fraction and exercise tolerance vs controls
4. Journal of Alternative and Complementary Medicine, Oosterveld et al. 2008, 'Infrared Sauna in Patients with Rheumatoid Arthritis and Ankylosing Spondylitis': Far-infrared sauna combined with supervised exercise produced statistically significant reductions in chronic low-back pain and disability vs control
5. American College of Cardiology, Consumer Resources on Sauna and Heart Health: ACC notes that patients with known cardiovascular disease should consult a physician before sauna use due to hemodynamic changes from heat stress
6. U.S. Food and Drug Administration, guidance on elevated core body temperature during pregnancy: FDA flagged elevated core body temperature above 101°F as a risk factor during pregnancy regardless of heat source
7. Finnish Sauna Society, Sauna Safety Guidelines and Statistics: Approximately 1.8% of sauna-related deaths in Finland involved alcohol
8. Internal Medicine, Matsushita et al. 2008, 'Thermal Therapy for Fibromyalgia': Fibromyalgia patients using far-infrared sauna therapy reported reduced pain and fatigue compared to baseline in a small trial
9. International Commission on Non-Ionizing Radiation Protection (ICNIRP), Guidelines for Limiting Exposure to Electromagnetic Fields: ICNIRP general public guideline for power frequency magnetic fields (50/60 Hz) is 2,000 milligauss
10. Consumer Reports, Home Sauna Buying Guide: Two-person infrared sauna units cost approximately $2,000 to $5,000; single-person models range $1,000 to $2,500 depending on brand and features
11. Journal of Environmental and Public Health, Genuis et al. 2011, 'Blood, Urine, and Sweat Study: Monitoring and Elimination of Bioaccumulated Toxic Elements': Sweating can help eliminate small amounts of heavy metals like lead and cadmium; sweat is not a primary detox organ
12. JAMA Psychiatry, Raison et al. 2016, 'A Randomized, Sham-Controlled Trial of Whole-Body Hyperthermia as a Treatment for Major Depressive Disorder': Single session of whole-body hyperthermia to 101.3°F significantly reduced depression scores vs sham, with effects lasting six weeks
13. U.S. Energy Information Administration, Electric Power Monthly, Average Retail Electricity Prices 2024: U.S. average retail electricity rate was approximately $0.16 per kWh as of 2024