I was wondering if there is a temperature that I should close the little door from our chickens house to their run. We are in NC and it hasn't really gotten cold here yet. Their whole house run set up is fairly small and we have made it predator proof. We leave the little sliding door from their house to their run open all the time so they can just go in and out as they please but with the cooler weather arriving I want to make sure the girls aren't cold at night. I was thinking I should shut the door if the temps drop below 40 degrees. Does that sound right or should I close it at higher or lower temps? Thanks!