I know heat can be very dangerous for chickens. We had 95 degree humid weather today and more of the same tomorrow. I had two of my Rocks who started panting so I was obviously quite concerned for them. They had watermelon and water but they still got warm. I took a bin and put a few inches of water in it and took them, one by one, and made them sit down in the water. I held them there, and they did not protest, for a few minutes. After a few minutes I let them go and they were totally fine for quite while. After a few hours one of them started panting just a little so I gave her a brief dip and she was fine again. I don't think they were extraordinarily hot because although they were panting they were acting fine otherwise but nevertheless, the remedy really seemed to make them comfortable. Of course their breast and bottom feathers stayed wet for a while and their was a breeze so no doubt that helped keep them cool after. Worked really well, thought I'd share. Hope it helps.