Hopefully I posted this in the right forum. This fall I patched some holes on my coop because last winter the chickens didn't seem to be handling the cold well, and there were some very large holes. The coop is 4'x4' and has 12 chickens and a duck in it. The bird spend the day in our greenhouse. For the next week, multiple days are going to have high's in the teens. What are some sings (preferably on the chicken) that the humidity is too high, and I need to add some ventilation?