Hola! We live up in NH, and our winters get very cold. Our coop is too small to be feasibly insulated, and i was wondering if they would need a heat lamp. I am getting mixed reviews from my friends who have chickens. One says yes they should have extra heat, and the other says that they can stay warm by themselves. The three chickens are Barred Rock, Wyandotte, and Golden Comet. Do you think they'd need extra heat?