Help. My four pullets are quickly outgrowing their indoor home. We already went up a size once and I don't have anything bigger to safely keep them in inside the house. They are 2.5 weeks old and getting their big chicken feathers in but I know they should be kept warm until about 5 weeks and we are due for more cold weather coming up. Do I try them in the coop with the heat lamp or keep them in the house and worry about them getting crowded and aggressive towards one another.