The big coop doors are mainly for cleaning access. I found that if I leave them wide open during the day, the coop dries out and stays cleaner. Poop dries in the sun, bugs fly out. The coop is 35" from the ground, and the hens fly right up into it from their enclosed yard area. Their "official" access to the coop is via a roost and ramp in a fully enclosed run, that lead to a small chicken door in the coop.