Hello! My DH and I are building our first coop and I'm wondering whether we need to insulate at all. We are close to the Bighorn mountains in Wyoming and temps can range from 105 in July (summer usually lasts 3 months) to week long bursts of - 15 in the winter (we get snow at any moment from September to June). Do we insulate or should good walls keep the birds warmth around them in the winter? I don't want to roast them in the summer.