Infrared vs Traditional Sauna

If you're trying to decide between an infrared sauna and a traditional sauna, you're asking the right question. They look similar from the outside, but they heat your body in fundamentally different ways, produce different physiological responses, and serve slightly different purposes. This guide breaks down every meaningful difference so you can choose with confidence.

How They Heat You: The Fundamental Difference

Convection vs. radiation, and why it matters.

A traditional Finnish sauna heats the air around you using an electric heater, wood stove, or gas burner, typically with a pile of rocks that you can pour water on to create steam (a "loyly"). The hot air warms your skin through convection, and your body responds by increasing heart rate, dilating blood vessels, and sweating to cool itself. The experience is intense: the air is hot enough that breathing can feel sharp, and sessions typically last 10-20 minutes.

An infrared sauna uses infrared lamps (usually far, mid, and near infrared) to emit radiant heat that penetrates your skin directly, warming your body from the inside out rather than heating the air around you. The air temperature stays lower (110-150°F), but your core body temperature rises similarly. The experience is gentler: you can breathe easily, sessions run 20-45 minutes, and many people find it more comfortable for longer durations.

The key physiological difference: traditional saunas create a larger cardiovascular response (higher heart rate, greater blood flow) because your body has to work harder to cool itself in hotter air. Infrared saunas create a more gradual, sustained sweat that some research suggests may allow for deeper tissue penetration.

Temperature and Comfort

What it actually feels like inside.

For people who find traditional saunas too intense (those with respiratory sensitivity, heat intolerance, or who are new to sauna), infrared is a much more accessible entry point. The lower air temperature means you can stay in longer, which some research suggests allows for a comparable total sweat volume despite the gentler heat.

Health Benefits Compared

What the evidence says for each.

Both types of sauna produce the core benefits of heat therapy: improved circulation, muscle relaxation, stress reduction, and cardiovascular conditioning. The differences are mostly in degree rather than kind.

The strongest long-term evidence comes from Finnish cohort studies on traditional sauna. A landmark 2015 study by Laukkanen et al. in JAMA Internal Medicine followed 2,315 men for 20 years and found that frequent sauna users (4-7 times per week) had a 63% lower risk of sudden cardiac death and a 50% lower risk of all-cause mortality compared to once-weekly users. This study is specific to traditional Finnish sauna, and while infrared may produce similar effects, the research hasn't been done at the same scale.

Recovery and Performance

Which is better after exercise?

For post-exercise recovery, both sauna types help by increasing blood flow, reducing muscle tension, and promoting relaxation. The evidence slightly favors traditional sauna for acute recovery because the higher heat creates a stronger vasodilation response, flushing metabolic waste from muscles more aggressively.

However, infrared saunas may have an edge for chronic pain and joint issues. A 2018 study in Clinical Rheumatology found that infrared sauna therapy improved pain and stiffness in patients with rheumatoid arthritis and ankylosing spondylitis. The deeper tissue penetration of infrared light may provide more targeted relief for joint and connective tissue issues.

Cardiovascular Effects

Heart rate, blood pressure, and long-term heart health.

Both sauna types raise heart rate and increase blood flow, mimicking the cardiovascular effects of moderate exercise. A traditional sauna at 175°F can raise heart rate to 120-150 bpm; an infrared sauna at 130°F typically raises it to 100-120 bpm.

The Finnish cardiovascular studies (the strongest in the sauna literature) are based on traditional sauna use. While infrared saunas almost certainly produce cardiovascular benefits through the same mechanisms (vasodilation, improved endothelial function, reduced blood pressure), the specific long-term outcome data is thinner.

For people with cardiovascular concerns who have been cleared by their doctor, infrared saunas may be a safer starting point because the lower temperature produces a gentler cardiovascular response.

Cost Comparison

Studio sessions and home units.

Infrared saunas are generally cheaper to buy and run at home. They plug into standard 120V outlets (most models), while traditional saunas often require a dedicated 240V circuit. The energy cost difference is significant: infrared saunas use about 1.5-2 kW per session versus 4-6 kW for traditional saunas.

Which Should You Choose?

Decision guide based on your goals.

For Contrast Therapy

Which pairs better with cold plunge?

For contrast therapy (alternating hot and cold), traditional sauna is generally the better partner for cold plunge. The reason is temperature differential: a 175°F sauna followed by a 50°F plunge creates a 125° swing, which produces a strong vascular pump. An infrared sauna at 130°F followed by the same plunge creates only an 80° swing.

That said, infrared saunas still work for contrast therapy, especially if you're sensitive to high heat. The gentler heat may allow you to stay in longer before plunging, which can partially compensate for the lower temperature. Many studios offer both types, so you can experiment.

Learn more about the full protocol in our Contrast Therapy 101 guide, or compare cold plunge and sauna directly in our Cold Plunge vs Infrared Sauna guide.

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