How Infrared Saunas Actually Work: Near, Mid and Far Infrared Explained

Picture standing in the sun on a cold day. The air is chilly, yet your face feels warm. That is radiant heat: energy travelling as light, absorbed by whatever it hits. An infrared sauna works on the same idea.

A traditional sauna heats the air (often to 80–100 °C) and the air heats you. An infrared sauna warms you directly, so the cabin air stays much lower, typically in the 45–60 °C range. For many people that makes the experience easier to sit through, especially if very hot, humid rooms leave them uncomfortable.

Infrared is the part of the light spectrum just beyond what we can see. It is usually split into three bands, and the names are only about wavelength.

Our two-person Halo 2 is a full-spectrum cabin, meaning it is designed to deliver more than one band rather than only far-infrared.

Because the heaters aim energy at your body rather than boiling the air, you can reach a good sweat at a lower air temperature. Many people tell us they can stay in longer and come out feeling relaxed rather than wrung out.

It also affects the room. Cabins heat up in a matter of minutes instead of the long preheat of a stove sauna, and they use far less power than you might fear. A single-person cabin like the Halo 1 is rated around 1,350 W, similar to a strong kettle.

Both give you heat and a good sweat. How they get there is different, and that changes how a session feels.

Neither is 'right'. Plenty of people enjoy both. If you are leaning towards infrared, our buying guide takes you through the decision.

Sweating is your body's cooling system. Radiant infrared warms your skin and the tissue just beneath it, so your body starts to cool itself even when the air is not hot. That is why you can sweat freely at a lower cabin temperature.

The upside is comfort: you can usually breathe easily and chat, read or listen to music. The key is to listen to your body. Hydrate before and after, step out if you feel faint, and keep sessions sensible. Our session guide walks you through it.

Near-infrared overlaps with the light used in red light devices, which is why some cabins describe themselves as 'full spectrum'. If you are curious about the difference between heating and light-focused devices, read red vs near-infrared wavelengths and our red light therapy guide.

Different heaters emphasise different bands. We compare carbon, ceramic and quartz options in full-spectrum vs carbon vs ceramic heaters.

We would rather be straight with you. An infrared sauna is a wellness experience: warmth, relaxation, a good sweat, a calm hour in your day. It is not a medical treatment, and we do not claim it cures anything. If you have a heart condition, are pregnant or take medication that affects heat tolerance, speak to your doctor before starting.

If you enjoy the idea, the next step is practical: which heater type suits you and how to run your first session. The full overview lives in our infrared sauna buying guide.