Don't worry, be happy... How old are they? I don 't heat my coops. My birds are just fine. They have shade trees in each of their pens for the summer heat and shade/rain tables also to get under. These are older pictures and we have added more coops with pens and more trees in their pens. The white rope wire around the bottoms of the pens is electric to keep the predators out especially at night. Once they know the electric wire is there and get shocked, they don't come back to test it out again. Also all of the pens are covered with a heavy duty netting. I have had my share of predators in the past.
Chick grow-out coop with a heat lamp.
My chickens are a year old and molting a lot. I hope all of the feathers grow back, soon. I have a big walk-in coop for them. Part of it, blocked off from the wind and rain and the other part lets the sun in. You have a lot of chickens. I have six hens and one rooster right now. I'm looking for another six to eight hens, soon. Thank you for the information.