Here is your Arizona state thread:
https://www.backyardchickens.com/threads/arizona-chickens.31227/
I'm in the steamy southeast, where the issue is heat combined with humidity rather than your oven-like dry heat, but IMO, the key factors are:
Choose suitable breeds. Most hatchery catalogs include heat and cold tolerance in the information they give you about different chickens. Also, if you choose chicks from a hatchery/breeder located in a similar climate you can be more confident that they can tolerate your conditions.
Ventilation, Ventilation, Ventilation: The more airflow the better in the heat. The open air concept is particularly valuable for hot-climate people, with at least one wall of the coop made of wire. This is a great thread on a coop in Texas:
https://www.backyardchickens.com/threads/texas-coop-build-pic-heavy.1371038/#post-22557467
Shade: Natural shade from vegetation is best, but in places where that's not available artificial shade of any kind is good. I put up a picnic fly over my small coop. Some people put up beach umbrellas. Some people cover their runs with shade cloth. Some people build little shade structures or even go as simple as a pallet up on concrete blocks.
Water: Lots and lots of water freely available all the time from multiple sources in case one fails.
There are some additional options available beyond the basics:
Access to ground they can dig in: Because it's cooler below the surface of the soil. On the shady side of the coop where I'd pilled up pine straw and dried grass clippings my flock dug holes deep enough to about bury themselves for dustbathing and loafing.
Electrolytes: Some consider this a key factor, others don't find it necessary. Offer one or more times a week according to the conditions but don't offer it as the only source of hydration because the taste may put the chickens off drinking enough. Imagine if you had only Gatorade to drink and never got regular water.
Wading Pools: Shallow tubs of water for chickens to walk in.
Ice Blocks: Either frozen to add to the waterer in order to keep the water cool or offered in a tub so that the chickens can either drink the cool water or stand/sit on the ice.
Misters: More valuable in your dry climate than my humid climate (where adding water to the air is more likely to increase the misery than decrease it). There are all sorts of models available or you can put a dial a setting nozzle on your garden hose to mist the area by hand for short-term relief.
Frozen Treats: Peas, berries, chunks of melon, whathaveyou. Can get expensive and you have to watch quantities so as not to unbalance your chickens' nutrition. I don't use this, except for when I toss some freezer-burned cooked meat into the pen still frozen.
I've probably missed a couple options. I personally didn't feel the need to go beyond the once a week electrolytes. As a matter of livestock-keeping philosophy I don't want to have breeds that require extraordinary measures to keep them healthy and would only start providing ice if we got temperatures significantly above our normal 95F with 95% humidity.