What are your goals in keeping chickens, besides survival in the heat? Eggs? Self-sustaining flock? Meat?
Light breeds would probably be best, if you consider only the heat. That would be breeds like Spanish, Mediterranean breeds, Games of various types, Leghorns.
But if you were interested mostly in eggs, you would chose Mediterranean breeds, Spanish or Leghorns.
If you wanted a self-sustaining flock, Games are where it's at because they are excellent broodies!
Note: none of these are really meat birds or even dual-purpose ---- they're small.
Do you have the room and fencing to deal with flighty chickens? Games aren't quite as flighty as some of the others.