I've never had problems with the fact that my chickens like to roost in the pine tree. But I am afraid that it is getting cold (I live in Chicago and we have terrible winters). Any advice? By the way, my coop for the chickens are a bit dafty for the winter and has an entrance that doesn't have a door. If I were to make my chickens sleep in the coop during winter, would it help and how could I make the coop more properly vented and insulated?