I'm going to recycle some French doors and use them as windows on my coop. I'll keep them open in good weather but I will be putting hardware cloth over the opening so that hens stay in and predators out. You could create a door with a large opening in it and put hardware cloth in the opening. It will let in summer breezes and keep the humidity lower in the hen house. An open pop door and a ceiling vent should create an updraft which would keep humidity down. My run will be covered. We have many coyotes, hawks, and a pesky neighbor dog who likes to shake what she catches. I see opossums and coons dead along the road too, not taking chances.