Will my Run-Chicken Automatic Coop Door function properly in the cold weather?

Yes, depending on the temperature. Usable environmental conditions for the door are between −15 °F to 140 °F (−26 °C to 60 °C). The Run-Chicken Automatic Coop Door can withstand these temperatures, but for the sake of your chickens, you should insulate your coop, use heat lamps if needed, and heat the water to keep it from freezing. This will ensure that your chickens and the door will be very happy.