Hello, I am in CT and my chickens did great last night in 6°f with 30mph gusts. The coop has no solid wall on the south side and they made it with no frost bite or issues. No heater just an electric waterbowl. I had my concerns during planning and construction but it all worked out. Anyone thinking of this type of coop should not be concerned within these parameters. More north and more cold I cannot vouche for. Chickens 4 Life!