Hello First time Chicken owner here. I did draw a design for a coop but was a little overwhelmed with the thought of building it so I bought one. I built it today and I think it's super cute My question is- it has a premade window, covered in the chicken wire stuff. But what about in the winter? I know they need ventilation so I don't want to close it all up it I feel it may be to big (and cold) to leave as is. Any tips?