We have been raising chickens since 2012. We had 4 old hens and added 19 new chicks last year. They have a securely enclosed house and get out to fenced run each day. (gate from house area to run). They get along, but about 6-8 of them do not go inside to roost at night. They sleep on top and underneath the house. When we added the new hens we put new roosts in the house all at the same level. That was a mistake. We are cleaning the house out today and plan to put in new roosts at different levels (to accommodate the pecking order). How can we get all of them to go inside now? Our weather in Central Missouri is ok, but we did have some very cold nights this past winter.