I have 3 hens in a very simple chicken tractor. The whole set up was gifted to me, and I haven't had the money to get a proper coop built. Two hens roost together, leaving the third alone. I'm worried that she won't stay warm enough if she's on her own, the temperature is supposed to be 10F tonight. I CAN put them in the basement, which I don't mind doing, because I am worried. I want them to be comfortable & safe, but I don't know if it would stress them more than it would help them.