Hi,
we are in Arizona City. During the hot days we used a double-nozzle mister outside of the coop, which gets shade duringth e PM. it is mostly wire for good ventilation, and the mist will blow in and get the floor wet.... and the feed. We use a sandy dirt floor and replace the dirt/ sand regularly. No heat distress seen. We used an electric fan a few days when not btreezy, as a Dark Brahma hens was "panting". The birds range on the lawn in late afternoon, and put themselves to bed at dusk. They always have fresh water, and do not eat much when it's raelly hot, so we have not restricted feed.