Last year they were fine in the cold. They have a large run and the coop goes into a shed we just build. They also can go in the shed if the wind is bad. They seem to be fine so far. When I laid down hay today they seemed very happy to scatch and play with it. Ill post a picture tomorrow so you all can see. Thanks everyone for their input! I guess chickens have lived on this earth for a long long time, even before heat lamps!