How Does an Infrared Sauna Actually Work?

How Does an Infrared Sauna Actually Work?

Walk past enough wellness studios, and you will notice something odd. Some saunas hit you with a wall of heat the second the door opens. Others stay surprisingly mild, yet everyone walks out just as flushed and glowing. The difference is not the studio; it is the technology. An infrared sauna works by warming your body directly with infrared light, rather than heating the air around you and waiting for your body to catch up. It is a genuinely different process, and once you understand it, the whole experience makes a lot more sense.

We get asked about this most days at our Jewellery Quarter studio, usually by someone standing at the desk wondering why the room they are about to sit in feels nowhere near as fierce as they expected. So we thought it was worth setting the record straight properly, from the science behind it through to what you should actually wear and how long to stay in for.

Heated air versus heated you

A traditional sauna works by convection. A stove or heater warms the air in the room, and that hot air circulates, and eventually your body absorbs enough of it to start sweating. It is effective, but it is also indirect, and it is why traditional saunas need to run so hot, often 80 degrees or more, to have any real effect within a short visit.

Infrared saunas cut out that middle step entirely. Infrared panels emit light energy that reaches your skin and warms your body directly, the same type of energy you absorb from sunlight on a warm day, minus the ultraviolet rays that cause sunburn. Because the heat is working on you rather than on the room, an infrared cabin can sit at a much gentler 45 to 60 degrees and still produce a deep, satisfying sweat. Nothing about the process is watered down; it is simply working on you rather than the space around you, which is part of why it suits people who find traditional saunas uncomfortably intense.

What it actually feels like once you’re in there

This is the part most people are surprised by. There is no wall of heat to brace against as you step inside, no sharp intake of breath. Instead, the warmth builds steadily as you sit, which is exactly why infrared sessions tend to run longer than a traditional sauna visit, typically 30 to 45 minutes rather than the 10 or 15 minutes you might grit your teeth through elsewhere.

Yes, you do sweat, often more than you expect given how mild the room feels. That is the direct heating at work beneath the surface rather than on it, encouraging the body to work harder than the ambient temperature alone would suggest. Most people find they can properly switch off during a session instead of clock-watching, which is a large part of why infrared has become such a regular fixture in people’s wellness routines here in Birmingham rather than an occasional treat, often paired with a sports massage or a stretch of quiet time before heading back out into the day.

What to wear, and how long to stay in

Loose, breathable clothing is the easiest option; a t-shirt and shorts or gym kit works well, though plenty of our regulars simply wear a swimsuit or go with a towel. There is no strict dress code when it comes to what to wear in an infrared sauna; the only real rule is comfort, since you will be sitting for longer than you would in a traditional sauna and want to be able to relax fully into it.

For your first visit, aim for around 20 to 30 minutes and see how your body responds. Once you are used to the heat, many people build up to a full 45-minute session. As for frequency, two to three sessions a week is a common, sustainable rhythm for people using it as part of an ongoing recovery or relaxation routine, though even one session a week will make a noticeable difference to how you feel.

Infrared sauna or steam room: which suits you?

This is one of the most common questions our team hears, and it makes sense; the two get lumped together constantly despite working in completely different ways. An infrared sauna vs steam room comparison really comes down to heat source and humidity. A steam room uses moist heat generated by boiling water, warming the air to a high humidity at a moderate temperature. An infrared sauna uses dry, direct heat with very little humidity in the room at all.

If you want a lighter, more humid environment, particularly good for the sinuses and airways, a steam room is usually the better fit. If you are after a deeper sweat, a longer session, and a lower ambient temperature you can properly settle into, infrared tends to win out, especially for anyone building it into a wider recovery routine alongside our sports massage in Birmingham. Neither is objectively better. It genuinely comes down to what your body responds to and what you want out of the half hour.

Far infrared and near infrared, and why it matters

You may also come across the terms far infrared and near infrared while researching this, and it is worth knowing the difference rather than treating the two as interchangeable marketing terms. Both sit within the infrared spectrum, but they penetrate the body to different depths, which is what actually shapes how a session feels.

Far infrared is the more common choice in studio settings, ours included, because of how effectively it drives a deep, sustained sweat that reaches the muscles rather than staying on the surface. Near infrared works closer to the skin and tends to be associated more with light therapy applications than with a traditional sauna-style sweat. In day-to-day terms, most people will not notice a dramatic difference in how a session feels, but if you are comparing studios or equipment, knowing which technology you are stepping into is a fair question to ask, and one we are always happy to answer before you book in.

How hot does it actually get?

This is probably the question we get asked most often, and understandably so, given how different infrared is from what people picture when they think of a sauna. Where a traditional sauna typically runs at 80 degrees or higher, our infrared cabin sits in that much gentler 45 to 60 degree range we mentioned earlier, low enough that you can comfortably settle in for the best part of an hour rather than counting down the minutes.

If you would like the full breakdown of temperature, session length, and exactly what to expect from the moment you arrive, we cover all of that in detail on our infrared sauna page.

Come and feel the difference for yourself

Reading about how an infrared sauna works only tells you so much. The rest is genuinely better experienced than explained, and it usually only takes one session for people to understand why it has become such a firm favourite among our regulars, whether they come in for the heat alone or pair it with one of our other treatments as part of a longer visit.