We have a re-purposed metal garden shed, turned coop, that is 10x9. We will soon be moving our 6 chicks (red sexlink) out there and I want to make sure to insulate, if necessary, before they go out. Our temps do drop to -25-30C in winter, and I know this question gets asked constantly, but most people have plywood, which holds heat differently. Just looking for opinions, though I'm sure they will be fine.