Hey gang! My new coop is going in the new barn. I can make a coop up to 96 sq. ft. I've got 12 straight run chickens coming so I have no idea how many will be girls and how many will be boys in the end. My concern is the winter...we live in Canada so winter can be cold. And the main barn door needs to be open for the donkeys to come a go as they please. So I don't want to the chicken coop to big so it can retain as much warmth as possible but not to small they don't like each either. Any thoughts?