I live in Atlanta, and would like to turn half of a large doorless barn into a chicken coop. My barn has two large openings in front that have no doors. I plan to divide the barn down the middle with chicken wire (nailed to a wooden frame, of course) and use one half as the coop. I plan to cover that door with chicken wire and put a chicken door in so they can go out to their run. The run will be outside that side of the barn. So, the coop would have real walls on two sides, a ceiling overhead. A third side would be inside the barn, but the barn doors are large and open. The fourth side (the barn door) would be covered in chicken wire. Any advice on whether my chickens will be warm enough here in Atlanta?