I live in KY. Our winters can get cold. I'd like to set eggs in the next few weeks. The the chicks will move to a coop outside asap. (The chickens I have now moved outside at 8 weeks in April. It was chilly at night so we put a 150 watt lightbulb out there. Will I be able to move them out in mid-late fall? Will a lightbulb be enough heat?