NorthFLChick gave you some good advice already. Unfortunately, I can't add much, since I don't have experience raising chickens in really hot/humid climates.
Good luck with your future chickens, though! You're going to have a nice mixture of breeds.
I am in Middle Georgia and we do have very hot, humid summers. I have BR's and BO's. Surprisingly the only heat exhaustion we have seen was a barr when temp was not really high, just a dramatic change. Shade, Fan and cool treats is the key. Surprisingly, the BO's have never showed any heat stress. Good luck with your new adventure.
and Welcome To BYC!
