It's going to be in my backyard which is fenced, but it gets pretty windy in my area. I will have windows all the way around that open. Think large backyard tool shed with windows and a door kind of deal. I was wanting to just put the little vents at the top too because it's going to be pretty air tight.I would think ventilation wound be on the south and north side optimally. Window on the south side. It all depends on the exposure of the coop. If it's out in a field, wide open to the wind, I would think ventilation would need to be minimal unless the coop is air tight constructed.