TMD, I love your coop. We have a tractor but find that it really doesn't protect the chickens like a good coop will, so we are in the process of converting a 9x12 shed into a cold weather coop. We will also attach a 20x20 covered run so that they can still go out in the winter if they wish. For us it was more than just the cold at issue. During the colder months there are more predators waiting to get a nice fat chicken. We figured that we could make due with 5 sq ft per bird. The shed is insulated and has power and a window a/c. I would like some heat but may have to wait a year for that. The heat is more for me than the birds though.
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