I would have left them on the roost.The tiny and little chicks spent the night in the old coop. First night out for the tinies. They did great. I swear that this second batch of babies are braver than their brothers and sisters who are 3.5 weeks older! I've been putting the older chicks in the tractor for the past couple of days. They've been using a cat crate as their security blanket. Last night was their first night without supplemental heat. They were up on the roost, but with it being their first night and a window adjacent to either end of the 4' roost, I thought it might be too cold for them, so stuffed them in the cat crate. Someone wanna weigh in and tell me that I should have left them on the roosts??? They are 5 weeks old tomorrow.