My uncle, in the 50s, ran a poultry farm. He was in the California desert. No air conditioning, but he would run fans. He lost many chickens during the summer months. Heat and chickens can be a real challenge.
Heck, it's a challenge for humans. I spent the final seven years before retirement at a California state park on the Colorado River twenty-five miles from Yuma, AZ, and summer lasted a good nine months, temps averaging 117F from July to the end of October. I don't see how people came to my park to camp during that time. I guess they loved torture. But the cat fishing was good.