They are feathered out, but the floor of the coop is hardware cloth and 3ft off the ground, so it might be a bit drafty. It was planned with our hot spring/summer/fall seasons in mind, not winter.
I'd put a heat lamp in, but I made the shut so tight that I would have to leave it partially open...
I have 12 chickens total: 6 bantams (7 weeks old), 4 EE (5 weeks old), 2 barred rocks (4 weeks old). They have out grown their brooder and I moved them outside into the coop this morning. We live in North central Florida and our nights are in the 50's right now. Is that too cold for chickens...