I need some help winterizing my coop. It is 6' x 7' wide and 6' high sloping to 5' for my 3 chickens. It has solid walls on the back 4' and wire front. I have stapled plastic over the wire, except for the door. The chickens are already trying to rip off the plastic so need some help there. And on the door I want something that can be removed on warm days. I am in Wichita Kansas where we can get 0 temps or nice 60 degree days during the winter months. This is my first winter with chickens so any help is much appreciated. Want to keep my girls warm!