I purchased an automatic door from chickendoors.com and installed it Sunday. So far all the hens desire to stay out all night! I have programmed the timer and then opened it back up for the night because they weren't in by dark. I am going to try a light in the coop this week to see if they will go back inside at dusk. They are all 9 weeks old this week and the run is fully enclosed so I am not worried about them too much.