Does this article refer mainly to coops that the chickens stay in all the time? I have an enclosed run that is partially covered with a tarp for shade. The girls have a small bunkhouse that they sleep in at night. I think it's well ventilated because the roof sits on a 2" piece of wood; it's not sitting directly on the walls. This is my first year with my little flock (6), so I'm still not sure what winter will be like for them. I live in West Texas, where winter is generally a two-week vacation from summer, although we do get the occasional snow storm.