We have a small, suburban backyard coop and 4 hens. Our coop is elevated 3 feet off the ground and sits on an open run. There are two large screen windows in the coop which we covered with cardboard temporarily because we had a week of rain. There is also a hole in the floor of the henhouse which enables them to climb the ladder up or down to put themselves to bed or to let themselves out to the run. The cold weather came upon us quite suddenly - it's about 35 degrees outside now. We haven't had time to seal the small portion of the run with plastic to help to keep the heat in. It is likely to get below freezing tonight. Is it silly to worry about them being too cold? We should be able to get the plastic up and the light installed this weekend.