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Raising chickens in extreme heat and cold is tough! In the cold the chickens need proper ventilation, warm, dry bedding, heated waterers, 4" roosts and sometimes heat lamps. In the heat he chickens, again, necessitate ventilation, windows that can open, lots of cool water and plent of shade.
As far as bedding goes, straw is the best for trapping heat. It acts as a natural insulator also. Chickens love to dig and peck in it too. Sand is good in the hot months. However, I don't usually recommend it as it can cause crop issues in chickens if they eat it.
You need either a heated water base or heated waterer to keep the water from freezing in winter. Many people don't realize that chickens as well as other anime drink the same amount of water in the winter as they would the summer. So make sure it doesn't freeze. In summer, make sure it is cool and in shady areas.
If you plan to use 2X4" roosts be sure to position the roosts so that the chickens sit on the 4" side. Chickens, unlike other birds, like to sleep flat footed. This helps to prevent frostbite.
Hope this helps!
Good luck and welcome!
