I live in upstate NY and have already seen temps in the teens. I am not sure how to add warmth to my coop. My birds, 30, sleep in 3 different areas. The main group sleeps on a horizontal tree branch in the upper part or the roof's A-frame. The other two sleep on branches along the sides where the roof meets the wall. I put up clip lights but they knock them down. I was considering putting a strip of incandecscent lights to put heat in their backs. Also I was looking at the heated wire used to wrap pipes, thinking that I could run it under their branches and they would get the radiant heat. Suggestions? I have 6" of hay, but these guy sleep 7' off the ground.