Greetings
Deb T,
Mistings systems work great in low humidity, high heat environments. They are most effective, if you set up a cool zone in the run for the chickens. Place the misting system there, along with shade (trees, camo netting and/or woven tarps), and box fans. The box fans will keep things from becoming soggy, and create an evaporative cooling effect. My big Buff Orpinton's just love to stand in front of a fan as the breeze flows through their feathers. Also, if you place a container of water in front of the box fan, the wind chill effect will make that water nice and cold for a refreshing drink!
This is what I have done for my flock, as the Summers have been so extreme the last 5 years. I guess there is something to that global warming...
The chickens can chose to go over to the cool zone when ever they want. I also have a small window fan set up in one of the coop's windows, because some nights are almost as hot as the day! The chickens get a nice gentle breeze from that little fan at night.
Like
Blooie suggested, you'll have to make some adjustments, but it will be worth it.
This set up has really reduced the heat stress for my chickens, mine too!
These are my thoughts, on cool set ups, for hot, hot, Summers.
God Bless
