I live in an area that gets really cold, but I don't plan on running it 24/7, way too expensive for that long of a time. I think I'll just do what was suggested above and set it to turn on when it's lower than 70.How much and when you need it will be completely different depending on where you live. If you are in the north like me, its pretty much going to be on 24/7 from late October till early to late may. If you live in Georgia or something, you may only need it a little on only the coldest nights.