Not impressed. I have a small bathroom 5x8 and during the winter months here in NC, it gets a little cold in my bathroom. So I thought this item could heat up the bathroom so when I got out of the shower the room wouldn't be so cold. It hasn't worked so far. I actually turned the unit on 10 minutes before I was going to shower and set it to 82 degrees, closed the door then I went and showered with the vent fan off and the room was still cold when I got out. So if this thing can't handle a 5x8 room when the temperature is 50 outside and my home heating system is at 68, I don't have much faith in it being able to handle really cold weather. By the way, my home isn't old and is insulated well, the bathroom is on the second floor. Probably TMI .