I live in SW Arizona and the way I keep my girls cool is that I have lots of shade around there coop run (they also free range during the day). During the heat of the afternoon, which typically here in July is about 113, I wet the ground very well and then I hook the hose to a garden drip hose which I have wound around the top of the run. This drips water down the shade cloth and provides some evaporative cooling as well and a very nice damp area everywhere. The hens dig in and rest and take a siesta every afternoon. I also freeze water jugs at night and but them around the coop during the day to help provide coolness. So far no loss in egg production and no stressed hens. I do not have a grown up rooster yet, the young ones are separated from the hens right now, but I would not hesitant to pen them up at this time of year if it became a problem for the girls. Good luck!