I have read through this, and it gives really good food for thought. I live in a very cold climate with average winter temps in the single digits (degrees F). In building my coop (under construction now) I was mostly concerned about finding a way to keep heat in while still avoiding insulating the coop. Reading through the post, I am seeing that keeping heat in is less important than letting moisture out. I think I will have to cut out a few more ventilation windows.
With that in mind, what is the general consensus on closing the coop door. Knowing that the open air design works down to very low and negative temperatures, is having a coop door even necessary? Obviously coop needs to be protected from predators, but for an enclosed coop/run design can I stop worrying about closing the pop door at night?