I'm really not to wild about the idea either. Just because I don't like leaving things "on" while I'm not there...TV, dryer, dishwasher, etc. Last litter I didn't even use one..just made sure there were no drafts and kept the heat on where the house was warm. This time I cut it on while I was there and off while I wasn't. It's still really warm here and the room where Trixie and the kids are stays about 10 degrees warmer than the rest of the house. I actually have worried about it being
too hot in there.