If your temps go to -40, I would insulate, but I would still put in lots of vent space.
Also, I would keep the water in a separate spot than the perches, to help reduce humidity in the perch area.
I have an insulated coop that is connected to an uninsulated highly ventilated shed that holds the food and water, and that is connected to a greenhouse.
Really, the best idea in Alaska is to have the coop connect to, or be in the same building as the greenhouse. In the winter time, when you can't grow stuff, the chickens get that extra play space.
Also, I would keep the water in a separate spot than the perches, to help reduce humidity in the perch area.
I have an insulated coop that is connected to an uninsulated highly ventilated shed that holds the food and water, and that is connected to a greenhouse.
Really, the best idea in Alaska is to have the coop connect to, or be in the same building as the greenhouse. In the winter time, when you can't grow stuff, the chickens get that extra play space.