Good to know about their heat intolerance. I am 99.9% sure I have a Roo that came with a "meat bird grab bag" deal from Cackle. He had a rough start so I'm already quite attached to him. We have extensive shade but are in the deep, deep south. I'll be keeping a watchful eye on him as we near August......
I freeze large jugs of water (old cranberry jugs, vodka jugs [from making extracts of flowers and pollens], milk jugs...) and put them in the shade of the run for mine. You have to alternate a few times a day, but it cools the area and it has been a literal life saver.