I never did last year and they seemed ok but ALL 6 that were in that coop at the time always went up to the coop and huddled together. This year, with their only being 5 in there at the moment, and none are going up to the coop to "roost" or huddle together I'm thinking about using the heat lamp in the shed just to get some kind of warmth in there. Not placing it directly on them but just in front of the coop so if someone IS cold and needs the warmth its there? IDK. I'm kind of frustrated that they don't go up to the coop at night. They just huddle together in the run underneath.For those of you with Silkies, do you provide them with any additional heat (light bulb)? I read somewhere where they recommended it. As I have 5 adult Silkie mixes and 3 teens in an 8x10 coop; Is there enough to keep each other warm? 2 of them huddle on the floor, while the 3 other adults roost. (The 3 little ones bunch in a corner) I'm thinking of providing something on the nights that get down in the teens here.