I live in TN and recently we have had temps of 0-19 degrees at night. The chickens I have now do stay in a chicken house but it isn't tight and while I do add extra hay on the floor and laying boxes they do not seem to be affected by the cold too much. I fight the water situation and have to...
I have had chickens roost during the summer along a fence and then refuse to move when the weather grew cold. They would not go into the chicken houses-there were two and had room to spare-but those dummies would roost on the fence even in ice storms.
Weather never seemed to plague them.