First time chicken owner, five grown (25 week old) birds. Coop from PVC pipe, hardware cloth and corrugated plastic, with a tarp on top and a platform with a roost about 2 feet above the ground. The platform is open on one end, and on the other is a wall of plastic (with a cutout egg door). The plastic also goes over the top. Pictures at http://peepcluck.blogspot.com/ and below. I live in northwest CT where winter days can routinely be in the 20s and occasionally get as low as 0. A lot of snow is predicted this year. I read on another, similar thread about a "huddle box" - is that sufficient? How big should it be? Does it need a roost? Or should I do more? Do I need a different structure altogether, that has more insulation all around? Advice from the experts would be greatly appreciated!