I guess I'm lucky in where I put my coop and run. It is frequently 95+ here in the summer, w/ humidity around the same number, but the hens always seem happy. The run is in the shade of a biggish tree. The coop itself has windows covered w/ hardware cloth, which are open in summertime (there are plastic panels that go over them in winter). I'm sure it's hot in the coop during the day but the chickens are really never in there except at night-I keep their food and water in the run so they stay out there. I worried at first when it got hot, but they have always seemed pretty comfy thanks to the shade--and even more, now w/ the new tarped roof I added over the run.
