I'm still new at this and this is our first winter with chickens. I'm confused on the difference between a draft and ventilation. Our coop is not insulated and for ventilation the eaves of the house are open (covered with metal screens for protection).The eaves are on the north and south sides. How do we provide ventilation without drafts? And what about condensation problems? My roo already has a little frostbite on his comb and it is going to be 17 degrees with 30 mile an hour winds tomorrow night. The coop is 4 x 8 and about 2 feet off the ground. Thanks for any help!