I eventually get used to the high heat. It's the humidity that kills me. It just get's hard to go out and do the yard work and such. We've had such high temps. and yesterday we had my son's HS graduation. I was sweating like a pig and the boys are required to wear a tuxedo vs. a cap and gown, I felt so bad for them.
As for the chickens the freak out when I spray or even mist them. So I just soak up the run and make mud, they love the mud