Do you close your door every day to your coop? My coop is on the small side (backyard city chickens) cannot fit no more than 6. It has a run attached to it that is 100% surrounded with wire, bricks and logs. Nothing is going to come thru cuz the wire is the itty bitty holes of hardcloth wire. There is also an open fenced in run for my girls. Not only that but our whole yard is surrounded by a fence. Due to evening events that seem to be nearly every day, during the school year, we are not home for the hens bedtime. I put them in the smaller 100% enclosed run attached to coop. There is a smaller bowl of food n water for them in this run. There have been more times than I have liked that the door has been left open, we get home really late. At first I was concern but now wondering if it's not a real bad thing. This way no one has to be up and out the door to let them out. They can hang out in their little enclosed run (yes, it's be enough for six) until one of us gets out there to let them into the larger area. Also we live in an region were our low is mid 20s. Summers are a bigger problem than the cold.