A neighbor asked me to help her with her chickens, since her husband is in the hospital. While helping her clean out the coop I noticed how warm it ws in there. Outside it was about 34 degrees and getting ready to snow, which it is doing now. After the coop was clean I asked her how they kept the coop so warm as I didn't see any light or heater. She laughed and said it is all natural and took me out back of the coop. I couldn't believe my eyes, they had built their coop over a compost pole. The compost pole puts out enough heat to keep the coop at or above sixty degrees all winter. They are well over seventy years old and said they learned this method from they parents as children. I have never seen this type of heat use in all my years around chickens, just goes to show you, you are never to old to learn something new.