i guess what i really want to know, what is the earliest i can remove them from the light (and put them in the coop)? typical night here is in the 50's. would they huddle up as a group for warmth? the coop does not have electricty, so a lamp there is not an option. how about a compost pile in the coop, would that generate enough heat?
up til now, i have had a broody hen do this work for me.