My coop is two rooms, each about 4' x 8' for 14 chix. There is an interior wall between them with an adequate opening. The roosts are in the further room and so are the nest boxes. They lay eggs in this room, but refuse to go in there for any other purpose and sleep on the floor in the first room. I have a 1'x2' window in the exterior wall of the first room and a much smaller window in the other room. Is the larger window causing the problem and keeping them in the first room? Then again, our weather is getting colder with nights nights into the 'teens. Maybe they are better off huddled together in the first room at night instead of spread between the two rooms?