for Vegas heat lots and lots of shade and fresh water make sure afternoon sun in NOT hiting them I almost lost my buff orphtingon twice this last summer from the heat once they found there fav spot under the bushes that has water in constantly from swamp cooler they all did a lot better but even then in the heat of the day all 4 of my birds used my doggys door came in side laid down on dog bed where fan was blowing on them would be there from about noon till 4pm. I also had a mister in the run they did not care for that but had no prob with the sprinker turning on and cooling off. I also have the air from the swam cooler from my bed room go into the coop (its right up agist my windo with a vemt from my windo into there coop I also use a small fan in the coop.