I know it's too hot to think of it ever being cold, but the day will come and I want to be prepared. Our coop has plywood walls and I want to put up shingles before we paint it. Should we put some kind of insulation on it first. I'm on Long Island. Our winters can vary. They can be relatively mild or quite cold. (0-20 degrees) Any advice would be appreciated. PS My chickens are Easter Eggers.