With that type of heating, the AIR is not warm. It radiates to the object, such as people, carpet, sofas, etc. but NOT to the air. It is not energy efficient as it works in such a way that it can take hours and hours to heat all the objects in a given room. The idea was to leave it on all the time so as to maintain the temperature of the objects rather than trying to heat them up after a cool-down. All that I have known that were installed have been abandoned with more conventional systems retrofitted.