What are the disadvantages of infrared saunas?
Quick answer
Infrared saunas operate at lower temperatures — typically 120–150°F (49–66°C) — than traditional Finnish saunas, which means a less intense sweat response and a different physiological stimulus. Concerns sometimes raised include electromagnetic field (EMF) exposure from heating elements, the weaker research base compared to traditional sauna, and higher equipment cost relative to entry-level traditional options.
How infrared saunas differ from traditional saunas
Traditional Finnish saunas heat the air in the room to 160–190°F (71–88°C), and the body absorbs heat through convection and radiation from the hot air and surfaces. Infrared saunas use panels that emit far-infrared radiation, which is absorbed directly by the skin and underlying tissue at temperatures of 120–150°F (49–66°C). The lower ambient temperature means the experience feels less intense — many people find it easier to tolerate for longer periods. The trade-off is that achieving the same level of core temperature elevation typically requires a longer session than in a traditional sauna. Whether this difference in mechanism and intensity produces equivalent physiological benefits is a genuine open question in the research, with studies on traditional sauna far more numerous and longitudinal than those on infrared.
The electromagnetic field question
Infrared sauna heating elements generate electromagnetic fields (EMF), which some users and manufacturers cite as a health concern. Infrared radiation itself is non-ionizing and is considered safe — it is the same wavelength of energy emitted by the sun and by the human body. The question is whether the low-frequency EMF produced by the electrical components of sauna heaters poses any additional risk. Most infrared sauna manufacturers publish EMF readings for their products, and many modern units are engineered to minimize emissions. Regulatory bodies including the International Commission on Non-Ionizing Radiation Protection set exposure guidelines that most infrared saunas comply with. Consumers with concerns about EMF should look for products that have been independently tested and that publish their EMF measurements transparently.
Lower temperatures: advantage or disadvantage?
The lower operating temperature of infrared saunas is often marketed as an advantage — making the experience more accessible, comfortable for longer sessions, and suitable for people who find traditional sauna heat overwhelming. But it is simultaneously a limitation: many of the cardiovascular and heat shock protein benefits studied in the Finnish cohort research are linked to significant heat stress at temperatures above 150°F (66°C). It is not established that the milder heat of an infrared sauna produces the same magnitude of cardiovascular adaptation or growth factor release as a traditional high-temperature session. Some infrared sauna practitioners compensate by staying in the cabin for longer — 30–45 minutes versus 15–20 minutes for a traditional round — though whether this equalizes the physiological outcome is not yet demonstrated.
Gaps in the infrared sauna research base
The most robust population-level evidence on sauna health benefits — the Finnish cohort studies linking frequent sauna use to cardiovascular longevity — was conducted in populations using traditional Finnish saunas, not infrared. The infrared sauna research base, while growing, consists of smaller studies with shorter follow-up periods and narrower outcome measures. There are promising signals on blood pressure, heart failure symptoms, and chronic fatigue in specific populations, but these cannot be directly compared to the decades-long Finnish observational data. This does not mean infrared saunas are ineffective — they likely provide meaningful benefits — but the evidence base is genuinely less developed, and claims made for infrared saunas sometimes extrapolate from traditional sauna research in ways that are not fully supported.
Who might prefer a traditional sauna instead?
People who specifically want the high heat stimulus documented in the Finnish longevity research may find traditional saunas a more direct match to the studied conditions. Athletes and practitioners focused on heat acclimatization for performance benefit from the more intense cardiovascular demand of higher ambient temperatures. Those who value the social ritual of the Finnish sauna — including the löyly steam response, the wood-burning aesthetic, and the high-temperature communal experience — will find it difficult to replicate that in an infrared cabin. Infrared saunas, on the other hand, suit people who want a longer, gentler, more private session; who are sensitive to extreme heat; or who are using the sauna primarily for relaxation and mild thermal therapy rather than intense cardiovascular conditioning. Both modalities have a legitimate place in a wellness practice.