This is my first winter with chickens and I'm planning on NOT adding supplimental heat to the coop. I've got 31 RIRs and my coop is about 10x13. It's not insulated but I think I've done a good job eliminating any drafts and ventilating. This morning when I got up it was 28 outside and 40 in the coop and the humidity in the coop seems to stay in-line with that of the outside air. It can easily hit -5 to -10 for a few days in a row here in S.W. Michigan. If chooks can get by in Alaska and Canada I'm hoping they will here as well
