We have a nice sectioned off area in our backyard where I plan to put the chicken run. We have an older shed back there that doesn't get much use, and I would like to turn it in to a coop. However, it's metal. It doesn't have any windows. It has sliding doors, but they are in bad shape so I plan on taking them off completely and maybe putting something else up to cover the entrance. Do they NEED to have windows, or is that purely cosmetic? During the day they will be in the run and have lots of fresh air and sunshine, but when in the coop, not so much. This is what ours looks like, just a different color. We built it on a wooden foundation to keep pests out. Thanks for your help!!