So, this will be our first winter with our chickens. We live in Michigan so the winters get pretty cold and can get windy and snowy. What do I need to know about winterizing the coop? Any tips or tricks that I should know? Any mistakes that you have learned from or ways that you have improved your winter coop over the years? Thoughts on heating it ...I hear that some people recommend putting in a heater and others don't think it necessary and others that are highly against it. Loved to hear your thoughts! Thanks!!