On Saturday I bought three pullets that are about ready to start laying and a rooster. They are in a commercial, two-story chicken coop. It will get down to 20 degrees F tonight. I was talking to a friend who said they could freeze to death in that cold. I found some thick cardboard and put in on the bottom of the top part, and covered it with wood shavings. They are cuckoo leghorns. I don't want to lose them. Will they be OK overnight? The rooster has a nice tall comb. At about what temperature should I put vaseline on it? Worried first time chicken keeper here.