The chicks are now going on two months old and are getting too big for their brooder in the basement. It's time to move them outside into their coop. One chick we have is clearly younger than the others and less developed. We've had her as long as the others, 4 weeks, but the others were clearly older when we bought them. Is 40 degrees at night too cold for chicks? I wasn't planning to provide heat in the coop, but my wife is worried about the smaller chick being too cold. The others have developed more/faster than her, although she's not too far behind. Maybe a week or two younger than the others.