My nesting boxes are incorporated into the raised coop. The coop has an open window on each side, plus the door the chickens use to get into and out of the coop/nesting boxes is open. The roof of the nesting boxes is hinged for easy egg retrieval and I leave it cracked about three inches. It still gets over 110 degrees inside and a couple of my chickens can't seem to get into and out of the nest box very fast. I've seen them almost panting like a dog, they've gotten so hot. I haven't forced them out of the nesting box since I'm not sure if they're done laying or not. How hot is too hot, how long is too long, is there anything more I can do? Is this anything I need to worry about?