Hello, @Pork Pie has given you some great links to help you with the AZ heat. And the folks over on the AZ state thread will be a good source of advice too.
Ask these folks about a secure run to keep the coyotes out and they have already mentioned about breeds with large combs to help with the heat. Welcome home to BYC...
You have been given some great advice on breeds! Fortunately in our arid climate, wetting the floor down and adding a giant fan allows for evaporative cooling, really cools the floor and air nearly 10 degrees. Cool feet mean cool birds. Good luck and welcome aboard!