I love this site. I logged in to see what I could find out about winter readiness and there was an article on the front page about making your coop winter ready! Highly recommend you read it! My question: My coop used to be an outbuilding housing cattle feed. It's has full sized double doors and is divided in half by a wall. I have girls on both sides so I have to have both doors open at all (awake) times. I close them at night. Once winter hits, this isn't going to be an option because any heat in the coop will be lost. I've considered various solutions but the easiest seems to be installing a doggie door which can be locked at night to prevent nocturnal visitors. But would the chickens use it or would they consider it a wall?