You are very welcome. When I first got chickens it just didn't seem right to have so many vents, however, I decided to listen to the advice of people who had chickens for years. They were right. Got down to -22 F here this winter, colder than normal. None of my girls got frostbite.
By the...
You'll need more vents than that. Chickens make a lot of moisture between breathing and pooping. I read somewhere that said you should have 1 square foot of vent for every chicken. I don't have quite that much. Yes, closing that window is a good idea or there will be a breeze on the birds...
Do you have any other vents other than the window? My concern is if you live in a place that has a cold winter, your coop will have no ventilation if you close that window to keep the breezes out. You need to plan on getting moisture from breathing and pooping out of the coop. In winter, a...