When we try other breeds when our flock gets smaller again, I'll look into some of those. For us, it's not just the heat, it's the humidity. We get heats in the 100-110 ranges, but then add in 40-80% humidity... and our poor birds aren't happy.Try some of the Mediterranean breeds, they lay very well and are much better in heat than American, English and Continental breeds.
My favorites are Penedesencas, Minorcas and Anconas. Leghorns, Catalanas and Spanish are good choices too.
We freeze gallon jugs and put that out there for them to lay on along with refilling the pool to make sure the water stays cool, plus mist all the dirt/ground to help cool it off.