An indoor infrared sauna is the most common home sauna purchase in the United States, because it asks so little of the house: no plumbing, no base, usually no electrician, and a footprint that fits a spare room. The things that go wrong are practical rather than technical, and all of them are avoidable with a tape measure.
Where it can go
A spare bedroom, a finished basement, a large bathroom, a garage bay or a wide landing. The floor needs to carry the loaded weight, which is modest, and tolerate the odd drip of sweat. Carpet is workable but a hard floor or a mat under it is better. Leave the maker's clearance behind and beside for the cabin to breathe.
The circuit
Most one and two seat cabins run on an ordinary outlet, and that is why they sell. Check the stated amperage against what the circuit already carries: sharing with a fridge or a window unit is how a breaker trips mid session. Many makers ask for a dedicated circuit even where the draw would allow sharing, and it is worth giving them one.
Getting it in
Cabins ship as flat panels, and the largest single panel is what has to come through the door, round the stair turn and under any ceiling drop. Measure all three before ordering. Panels are heavy and awkward rather than genuinely heavy, so two people are enough, but a tight stair with a low soffit will stop the job dead.
Heat, noise and the room around it
An infrared cabin warms its own room a little but not much, because it radiates rather than heats air. It is quiet apart from a small fan. The one thing to plan for is the door swing, which opens outward and needs the space, and the glass front, which means the cabin is visible: most owners want it where it looks deliberate.
Questions people ask about indoor infrared sauna
Will it heat up the room it is in?
Only slightly. Infrared radiates onto your body rather than heating air, so the surrounding room stays close to normal.
Can it go on carpet?
Usually yes, though a mat or a hard floor underneath is better for cleaning and for the cabin's feet.
What is the commonest problem?
Getting it in. Measure the largest panel against every doorway, stair turn and ceiling drop before ordering.