About windows in your coop; Make large openings, covered in hardware cloth, as windows. In winter, cover some of them with clear plastic, with a wood scrap frame. Easy! Wider roof overhangs keep rain out, and ventilation is most important. There's no need to actually buy windows. Also, if you have a Habitat Restore nearby, it's a great place to find doors and other useful items. It's a coop, not a palace, and needs to be predator proof and protect from wind and rain/snow. Mary