My apartment doesn't have a heated garage so I put one of these in the top ceramic surround of my one car garage to keep out the cold. It will be above freezing indoors to melt the slush from the car at night and I just leave it on 24 hours a day to keep the stove warm so the wet floor doesn't freeze and is mostly dry by evening. .Of course it's not very warm, but better than not warmed up. YRMV