I live in Mid-Nebraska where we are getting clobbered by an early winter storm and very cold temps of 19 degrees. I hadn't finished insulating my chicken tractor before the storm hit and I really hate the idea of electrical heat in such a small coop. I wasn't sure what I'd wake up to this morning. We have 4-5 inches of snow and the chickens are all okay, but I noticed my rooster shifting from one foot to the other as if they were freezing. I had some "HOT HANDS" hand warmers in my car, for emergencies. They are non -toxic and they really heat up!! I put one in an old glove and threw it in the back of the tractor. A few minutes later the temperature in the coop was noticeablly warmer! I also draped the tractor and run with clear plastic sheeting, loosly to allow ventilation but to prevent drafts. I put some pine bedding in the run so the chickens can venture outside the coop if they want to without their feet getting too cold.