Maybe close it off temporarily until they're using the coop? Depending on how big the opening is, it could just be bird netting stretched taut with staples, cardboard held in place with bricks, etc.They really like it under there so I hate to close it off to them. Will they just instinctively (eventually) go to the coup at night or do I need to administer some tough love and close off the space below the coup? I don't know the exact measurement but I do know it's high enough for a full grown chicken to stand under. Any thoughts?