The classic misconception
In order to enjoy your new indoor hot tub to the fullest and even after a few whirl sessions, you should definitely have certain basics prepared. The assumption that all you need to do after whirling in the tub is air it out and then turn up the heat is classically, classically wrong. The condensation will settle on the ceiling, on your walls and windows, because the increased temperature allows the air to absorb more moisture than usual, and usual for spa areas is often 30 degrees Celsius. The following happens when the room is now ventilated. There is a certain dew point here which is also known from the refrigerator, if you take something from there and moisture forms on this object.
If you would now simply wait until the object has the same temperature as the room, the condensation, i.e. the humidity would be gone. This is exactly what happens with the indoor hot tub in its wellness oasis. Thus, the goal is that the room does not get cool spots, such as by ventilating the room.