I think we are going to put our big ones in the barn with the alpacas. They can nuzzle down in the hay or roost on the gates but it should be warmer in there. We will run the salamander here and there to warm it up for all of them. There are only 4 silkies outside still since the 12 week olds are still in the house and Ashes and Snow are too brooding eggs. So I may just bring the the other four inside for the extreme cold. My large girls except for 3 have aprons on, and they seem okay in the coop, but I'm worried about frost bite in -14 weather. Its our first year with chickens so I wasn't sure how low of temps they could take. We have a heat lamp, but it worries me to use it in the coop.