It's been really hot here in FL too and even though their coop/run is in beautiful shade, there's just not enough breeze anywhere. I put a cheap box fan in there and run it all the time. Their favorite treat right now is ice water. I just put a plastic flat bottom bowl (food container) out there with some water and a big chunk of ice or several ice cubes and they all gather round and drink like mad. They have a regular waterer and they drink from that too, I'm sure the chilly water just feels so good going down! I've also made some mash for them using cold water, and they like that very much as well. Haven't tried watermelon yet - that's for this weekend, happy Fourth chickies! but they love frozen strawberries, the heels of my romaine lettuce (not frozen), zucchini, just about all the veggies I give them.