Hubs will FREAK if I suggest anything, but inside the coop gets hotter than the run. It's built of hardyboard, so tough to cut out more windows, but it could be done. If I go that route, is it best to ventilate down low because of the roosts being up high (to prevent direct drafts?) The coop is about 8x8 and it has an open doorway and two small windows. We bought a small fan to hang and that may be enough, but I think we need more.