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First of all, be sure you have plenty of shade and water for them. Make sure it's shady enough that you wouldn't have a heat stroke in there yourself. Like having the tractor not only with it's own roof, but under the shade of a tree as well with lots of air circulation. Even heat tolerant chickens will die in this heat wave. Also a great idea is to flood an area with the hose once a day so they can stand in water and wet ground to cool off. And never have just one, they'll be miserable. Need at least three.
I do these things and even though I have a breed that is not known to be heat tolerant (Orpingtons) they are doing well. They seem no worse off than my Dark Cornish or Polish. You'd probably do well with one of the sex links like Golden comet or production red. Also Rhode island red, Dominique (Dominekers to the old timers), and Barred Rocks are decent choices for good layers. Easter Eggers or Ameracaunas are usually more friendly, and they lay well too. Plus you get cool colored eggs.
You can go to the website of Meyer Hatchery, MyPetChicken.com, and McMurray hatchery. I think they all have a "help me find a breed" section where you fill in what you want in a chicken including heat tolerance and the website will suggest breeds. That might be a great place to start.
McMurray also has an iPhone app that has all of their breeds on there. It's two dollars, but it comes with a five dollar coupon, so it pays for itself!
You just select what you want your breed to have in it (ex: broody/non-broody, good/bad egg laying, good in confinement/free-range, etc.). It's fun and helpful!