I have 13 week old silkies doing just fine cuddled with the rest of their flocks. It is not freezing in their little houses from body heat. The ones who insist on sleeping on the roofs are cuddled together and happy enough.
I'm acclimatized to the point that a T-shirt is all I need at about 40°. I throw on a long sleeved, thin flannel shirt for an open jacket in the 30°. So yeah, I can understand why the chickens are perfectly fine with their down jackets.
Bedroom is currently 56°. I have a thin and thick blanket. Thicker one usually gets tossed off by morning because I get too hot. The german shepherd complains about it being too warm, but she always has liked the cold.
