We have some cool temps predicted in the next few nights. Tomorrow night down to 45 and Friday night down to 41. I am new to the chicken game so this is my first time with cool/cold temps. We have 4 Black/Blue Copper Marans. They are about 24 weeks old and laying. I have vents in my chicken tractor where they roost. Should I cover the vents for them in the next day or so, or will 41 degrees not need to be worried about? I don't have a cover for the roosting area door. Here is a picture of my tractor. I have vents on the sides and one in the front. Your help and advice is appreciated.