Before you plug it in, I want you to do this: When it gets below freezing, put on all your winter gear. From hat to boots and everything in between. Once you're all bundled up, go outside for a good while. Long enough to at least start feeling cool, but not cold. You'll know when you need to go in. Once you come back in, leave ALL of your gear on for at least an hour. I'd say go for over night, but that's not realisitc for you as a person. Your chickens, however, have to leave their gear on. They're wearing their winter coats all day and all night, inside and out. They don't get to regulate like you do. When you're too hot you can take off your coat.