My babies are so silly--95 outside and they're on the mhp, 65 last night and they're all up on the roost..... They do go under as I'm doing my nightly lockdown check, but soon come out and up they fly. At 3 weeks all of my red rangers are feathered out and getting red combs, my BO's are pretty well feathered (all pullets, so yellow combs) and my packing peanut is the size of a wren, getting a red comb and always the first to fly up to the roost. He is still fuzzy for the most part but doesn't go to the heat. They don't have to be shoo'd into the coop and rarely make much noise, so different from chicks raised using the heat lamp. My ac man came out to do some work several days ago and had his son with him helping. Son is a vet and was impressed with the mhp! Have a new convert.