I setup a heating lamp (red brooding light) in my coop. Going to have one day where the temp will get down to 7 deg. F. It is getting down to 25 deg F. tonight. (I live in Georgia) Forecast says it will only be low for about 3-4 days then it will get back up around/above freezing The light is mounted so it will heat the roosting bar area and the whole "inside" "upstairs" part of the coop. It should not get too hot. I also tarped over the open air part of the coop to protect from wind chill. I brought the drinking water in at night so it won't freeze up. I turned on the light and the birds started acting kinda like it was day time. It disturbed their usual sleep pattern. They were also bullying and pecking each other so I turned it off. I decided that 25 deg. F is probably warm enough to have no light. But I am still concerned about temps getting down into the teens or lower. Should I put the light on and just let them sort it out, or do you think they will be fine even on the days where it gets that cold.