Here is the back story, I live in western NY and it is winter. To protect my chickens from the cold wind blowing into the coop, I built a "Florida room" for them in the fall. Basically it is a 4' X 4" structure made of clear roofing material. The opening faces away from the predominate wind and the clear plastic blocks the cols winds and allows the sun to warm it up for them. I also installed a perch in there for them to relax on. A sweet set up for sure.
It has been great for them, but starting two nights ago, they seem to want to roost for the night out there. I have had to go out there and coax them inside before my automatic door locks them out. My first thought is that they are comfortable out there (it has been sort of warmish) and I am thinking of removing the perch. My coop is intact with no rodents or anything that might be spooking them. The entire structure is inside of a caged in run, but they it would not be as safe as inside the coop.