An infrared sauna is a type of sauna that uses infrared light to heat your body directly, rather than heating the air around you like a traditional sauna does. It operates at lower temperatures, typically between 100°F and 140°F, compared to the 150°F to 195°F range of a conventional Finnish-style sauna. The result is a gentler heat experience that many people find more tolerable, while still producing a deep, satisfying sweat.
How Infrared Saunas Work
Traditional saunas heat the air in the room using a stove or electric heater, and that hot air gradually raises your body temperature. Infrared saunas skip the middleman. Infrared lamps emit electromagnetic radiation at wavelengths your body absorbs directly, warming you from the inside out without needing to superheat the surrounding air.
This is the same type of energy your body naturally emits as heat. It’s not ultraviolet radiation and has nothing to do with tanning or sunburn. Think of how you can feel warmth from sunlight through a car window on a cold day. That warming sensation comes partly from infrared wavelengths, and infrared saunas replicate that specific band of light in a controlled environment.
Because the air stays cooler, humidity inside an infrared sauna is low, typically between 10% and 20%. Traditional saunas usually sit around 5% to 15% humidity but can be pushed much higher by pouring water over hot stones. The dry, moderate heat of an infrared cabin feels noticeably different from the intense, sometimes stifling atmosphere of a conventional sauna.
Near, Mid, and Far Infrared
Infrared light spans a wide range of wavelengths, and saunas use different portions of that spectrum. Near-infrared (0.75 to 1.5 micrometers) penetrates deeper into tissue, reaching the skin and superficial muscles. Mid-infrared (1.5 to 5.6 micrometers) sits in between. Far-infrared (5.6 to 1,000 micrometers) penetrates roughly 3 to 4 centimeters into the body, reaching fat tissue and the neuromuscular system.
Most consumer infrared saunas use far-infrared heaters, which account for the vast majority of clinical research on the technology. Some higher-end models market themselves as “full spectrum,” combining all three types. The practical difference for most users is subtle, but far-infrared is the best-studied and most widely available option.
Cardiovascular Effects
Sitting in an infrared sauna triggers a real cardiovascular response. Your heart rate can climb from its resting level up to 120 to 150 beats per minute, similar to moderate exercise. Blood vessels dilate, blood flow increases, and your body works to cool itself through sweating.
Studies in adults with at least one cardiovascular risk factor have found reductions in both systolic and diastolic blood pressure after 30-minute sauna sessions. A large, long-term study published in Mayo Clinic Proceedings found that men who used a sauna four to seven times per week had a roughly 47% lower risk of developing high blood pressure compared to those who used one less frequently. Researchers believe improved blood vessel function is the likely mechanism, since regular heat exposure appears to help arteries relax and dilate more efficiently over time.
Pain Relief and Muscle Recovery
One of the most common reasons people seek out infrared saunas is pain management. A two-year study found that infrared sauna therapy may be a promising treatment for chronic pain, with participants showing improved outcomes over the course of the trial. The increased blood circulation that comes with each session helps deliver oxygen and nutrients to sore or damaged tissue, which can speed up muscle recovery after exercise.
For athletes, regular use may help reduce the soreness and stiffness that follow intense training. The effect isn’t dramatically different from what a traditional sauna provides, but the lower operating temperature makes it easier to sit through longer sessions comfortably, which may improve consistency.
Skin and Body Composition
Sweating in an infrared sauna pushes impurities out through the skin, your body’s largest organ. Proponents point to research suggesting that sweat generated during infrared sessions can carry traces of heavy metals, pesticides, and other compounds, though the overall detoxification contribution is modest compared to what your liver and kidneys handle daily.
There’s more interesting evidence around skin appearance. Clinical studies have found that regular infrared exposure can increase collagen and elastin production, reduce the appearance of wrinkles, and improve overall skin texture and tone. A study from Binghamton University found that people who used an infrared sauna for 30 minutes, three times a week, dropped an average of 4% body fat over four months. Some sources claim a single session can burn up to 600 calories, though that figure is on the high end and likely varies significantly based on session length, temperature, and individual physiology.
How to Get Started
If you’re new to infrared saunas, start with shorter sessions of 10 to 15 minutes at a lower temperature, two to three times per week. This gives your body time to adapt to the heat stress without overdoing it. As you build tolerance, you can gradually extend to 20 to 30 minute sessions, three to four times per week.
Experienced users often settle into a routine of four to five sessions per week lasting 30 to 45 minutes each. The heaters in most infrared saunas reach peak output within about two minutes, so there’s very little preheat time compared to traditional saunas, which can take 30 minutes or more to reach temperature. This convenience is one reason infrared models have become popular for home use.
Hydration matters. You’ll sweat significantly, so drink water before, during, and after each session. Avoid alcohol beforehand, and consider bringing a towel to sit on and one to wipe down with.
Infrared vs. Traditional Saunas
- Temperature: Infrared saunas run between 100°F and 140°F. Traditional saunas typically operate between 150°F and 195°F.
- Heating method: Infrared heats your body directly. Traditional saunas heat the air, which then heats you.
- Humidity: Infrared saunas stay dry at 10% to 20% humidity. Traditional saunas can range widely depending on how much water is added to the stones.
- Warm-up time: Infrared heaters reach full output in about two minutes. Traditional saunas need 20 to 40 minutes to preheat.
- Comfort: Many people who find traditional saunas uncomfortably hot tolerate infrared sessions well, since the air temperature is significantly lower even though the body still heats up effectively.
EMF Levels in Home Saunas
Because infrared saunas use electrical heating elements, they emit electromagnetic fields. There’s no universal industry standard for sauna EMF levels, but a commonly referenced safety threshold is 12.57 milligauss for magnetic fields. Better-quality saunas aim for what manufacturers call “ultra-low EMF,” defined as under 3 milligauss for magnetic fields and under 10 volts per meter for electric fields, measured at the seating position where your body actually sits.
If EMF exposure concerns you, look for models that include third-party testing results rather than relying on marketing claims alone. The measurement that matters is what’s happening at body level, not at the heater panel itself.
Who Should Be Cautious
Infrared saunas are generally well tolerated, but certain conditions warrant extra care. Heart conditions like unstable coronary artery disease, heart valve disease, heart failure, or arrhythmias such as atrial fibrillation can make heat exposure risky. People with low blood pressure or kidney disease are more prone to dehydration and overheating. The same applies if you take diuretics, blood pressure medications, or anything that causes dizziness.
Pregnancy is another situation where infrared saunas are best avoided. Neurological conditions that impair your ability to sense heat intensity can put you at risk for burns. Older adults face a higher risk of dehydration and falls from dizziness. For children, it’s worth checking with a pediatrician before trying infrared sauna sessions, since their bodies regulate heat differently than adults.