redhen, I'm closer to the coast in Massachusetts, and I wanted to tell you it is a good idea to insulate here, especially in the summer! The coop was a good ten degrees cooler than outside all summer long. The winter is a problem if you don't have enough ventilation, as you've heard, but I still am happy we insulated, it is warmer in there overnight than it would be without it. I am leaving two windows cracked overnight, I open them wide during the day. The wind can't blow on the birds at night, they're way above either one on their roosts, and during the day, they're below them while they're in the coop.