this is a cheap way to cool down your flock it works for us. I use to keep 2 liter pop bottles frozen for my rabbits when it was hot out side they would lay next to them to cool off. now i keep the bottles for the chickens i will lay them on the floor about 6 for 18 birds they will peck at the bottles but they seam to stay close to them, we also have a fan blowing on them seames to help air cool the air also. hope it works for your flock