HI I'm new to chickens and this is my first winter. I'm nervous they will be too cold in their coop-which is about 10X12x 7 high for only 5 chickens. Can I put a box around a roosting pole so when they huddle together they stay warmer? I'm picturing, for example, a wooden box-such as a small bookcase with a roosting pole instead of the middle shelf. I would attach the back of the "bookcase" to the wall of the barn. It would rest on the shelf that is already in the barn-on which they are currently sleeping (in their own poop of course) Would this work for them and provide just a little more warmth bc there is less space to heat up? Or would they just go on top of it?