So I bought a heat lamp and extension cords and everything, and was wondering if i even need it for winter. Here in spokane at night during winter it can easily get below 0. I have 3 black asutralorps, 1 new hampshire red, and 1 dutch bantam. I read that chickens can get sick from going in and out of the coop if the coop is warm? Any help is appriciated,.