They did fine in the coop last night and it went down to 45, but tonight it goes down to 37, and 34 the next night. Is that too cold? The coop has solid walls but on two ends there is a triangular area just covered with chicken wire so the cool air can definitely waft in and all the warmer air generated by the chicks will waft through that wire. There are 8 nesting boxes in there that they can huddle in and the floor is covered in 2 inches of pine shavings. There are 27 chicks to keep each other warm if that makes any difference. If I should move them, I need to do it soon before it gets dark so your input is much appreciated!