I recently decided to combine my two flocks, one bantie and the other large fowl. Everything went well untill I bought a pair of LF Ameraucana at a show. Since then my banties have been geting harassed. I had them in a small plastic barn style doghouse before, but I am concerned that this will not be warm enough for my little biddies this winter. It gets pretty cold at night (30's to 20's), and in January can dip down to the teens. The doghouse has a door and roosts inside, and I wrap a black tarp (to absorb some heat from the sun) around it, and also over the side so their feeder doesn't get wet. Will this be adequate? I have 10 banties- will they keep each other warm enough?