Well I am working on my coop and I am wondering weather to make a solid door or one with hardware cloth for ventilation. I only have one window, and two little vents at the top roof, so I think I need more, but I cant put in another window. I wouldn't be able to close off the door ventilation, so what would they do in the winter? I live in Raleigh, NC so temps can get down to 20 I just dont want em' to freeze! Thanks!