There is no single “best” sauna. The right choice depends on what you want from it: cardiovascular protection, muscle recovery, respiratory relief, or simply a heat experience you can tolerate comfortably. Traditional Finnish saunas have the strongest research behind them, but infrared saunas and steam rooms each offer distinct advantages worth considering.
Traditional Finnish Saunas
Finnish-style saunas heat the air to 150–190°F (65–100°C) with low humidity, typically 10–20%. You sit in a hot, wood-lined room, and the surrounding air raises your skin and core temperature. Water poured over heated rocks creates brief bursts of steam, but the environment stays mostly dry. This is the oldest and most widely studied type of sauna, and the bulk of what we know about sauna health benefits comes from research on this style.
A landmark Finnish study followed over 2,300 men for more than 20 years and found striking dose-response relationships. Men who used a sauna four to seven times per week had a 63% lower risk of sudden cardiac death and a 40% lower risk of dying from any cause compared to men who went once a week. Session length mattered too: sessions longer than 19 minutes were associated with roughly half the risk of sudden cardiac death compared to sessions under 11 minutes. The same cohort showed a 66% reduction in dementia risk and a 65% reduction in Alzheimer’s risk among the most frequent users.
These numbers are adjusted for other health factors like blood pressure, smoking, diabetes, and cholesterol, so they aren’t simply reflecting that healthier people happen to sauna more often. Still, this research is observational, not experimental, so it can’t prove causation. What it does show is a consistent, strong pattern that hasn’t been seen with other sauna types simply because they haven’t been studied as long or as rigorously.
Infrared Saunas
Infrared saunas skip the hot air entirely. Instead of heating the room, infrared panels emit light waves that penetrate your skin and warm your body directly. The cabin temperature stays much lower, usually between 110–150°F, but you still sweat vigorously and your heart rate rises in a way that mimics moderate exercise. For people who find the intense heat of a traditional sauna overwhelming, infrared offers a more tolerable entry point with a similar sweat response.
Where infrared saunas show particular promise is muscle recovery. A study published in Biology of Sport found that a single post-workout infrared session significantly reduced muscle soreness and preserved explosive jumping performance the next day, compared to passive recovery alone. Athletes in the infrared group reported feeling more recovered and ready to train. The benefits were specific to soreness and explosive power; sprint times and static leg strength didn’t show meaningful differences between groups. If you train hard and want to bounce back faster, infrared may offer a practical edge.
The trade-off is a thinner evidence base. Most of the large, long-term studies on heart health and mortality used traditional Finnish saunas, and researchers have noted that the variety of protocols across infrared studies makes it hard to draw firm conclusions about optimal temperature, duration, or frequency. Infrared saunas likely share many of the cardiovascular benefits of traditional saunas, since they produce similar physiological responses (increased heart rate, blood vessel dilation, sweating), but the long-term data simply isn’t there yet.
Steam Rooms
Steam rooms operate at lower temperatures, usually around 110–120°F, but with humidity near 100%. The moist heat creates a fundamentally different experience from dry saunas. You feel the heat more intensely on your skin despite the lower temperature, and sessions tend to be shorter.
The main advantage of steam rooms is respiratory. The warm, saturated air helps open airways and loosen congestion, which can provide relief for people with asthma, allergies, or chronic sinus problems. If you’re dealing with upper respiratory issues or simply breathe more comfortably in humid environments, a steam room will feel better than a dry sauna. For cardiovascular and longevity benefits, though, steam rooms have less supporting research than traditional saunas.
What About Detoxification?
Sauna marketing often emphasizes “detox,” and there is real science here, though it’s more nuanced than the claims suggest. A systematic review in the Journal of Environmental and Public Health found that sweat can contain meaningful concentrations of heavy metals. Cadmium levels in sweat averaged about 5.7 micrograms per liter, roughly 190 times higher than blood plasma concentrations. Daily cadmium excretion through sweat (120 micrograms) was four times higher than through urine (30 micrograms). Lead concentrations in sweat were also dramatically higher than in blood plasma.
For people with elevated toxic metal exposure, sweating appears to be a legitimate excretion pathway that can complement what the kidneys do. One case report showed mercury levels normalizing with repeated sauna sessions. However, for the average person without unusual exposures, the amounts involved are small, and your liver and kidneys handle the heavy lifting of detoxification regardless. Any type of sauna that makes you sweat will provide this benefit equally.
How to Choose Based on Your Goals
- Heart health and longevity: Traditional Finnish saunas have the strongest evidence. Aim for sessions longer than 19 minutes, multiple times per week, at temperatures of 150°F or higher.
- Post-workout recovery: Infrared saunas have direct evidence for reducing muscle soreness and preserving next-day performance. The lower ambient temperature also makes it easier to sit in one shortly after exercise.
- Respiratory relief: Steam rooms are the clear winner. The near-100% humidity soothes airways in a way dry heat cannot.
- Heat tolerance issues: Infrared saunas let you get a full sweat session at temperatures 40–60 degrees lower than a traditional sauna. If you’ve tried a Finnish sauna and couldn’t handle it, infrared is worth trying.
- Home installation: Infrared saunas are the most practical for home use. They plug into a standard outlet, require no plumbing, heat up in 15–20 minutes, and cost a fraction of building a traditional sauna room.
Safety Considerations
All sauna types raise your heart rate and lower your blood pressure, which is exactly why they benefit the cardiovascular system over time but can pose risks for certain people. Sauna use is contraindicated for anyone with unstable chest pain, a recent heart attack, or severe narrowing of the aortic valve. Dehydration is the most common everyday risk, so drinking water before and after every session matters more than which type you choose.
Alcohol and saunas don’t mix. The combination amplifies dehydration, drops blood pressure further, and increases the risk of dangerous heart rhythm changes. Most sauna-related medical emergencies in Finland involve alcohol use, not the sauna itself.