I live in North Alabama. It can get cold in the winter, but REALLY get's hot and humid in the summer. We are about to start building our portable coop, and I was planning on insulating it, but after reading what others have said, now I'm just confused. I am planning on having plenty of ventilation, open at the eves, covered with hardware cloth, and again open all along the underside where the roof comes down over the sides, and covered with the cloth, so there will be plenty of air flow, but I don't want them getting too cold, nor do I want them to over heat in the summer. I thought insulation works both ways, keeping it warmer in winter, and cooler in summer. My coop (chicken tractor) will be somewhat small, we are getting 5 chickens, it will measure 5x4, and only about 3 feet tall, with a run underneath and out 6 feet to the side. So it will give them their minimum space requirements, but since it will not be tall, I will not be able to hang a heat lamp in there, so that's another reason why I wanted to insulate. Any of your thoughts are appreciated!