I have a 4x6 coop that is almost done. I have windows on all sides but I'm thinking about winter. There's really not enough room to put additional ventilation above the windows. Would I be better off to design a "baffle" to keeping a breeze out to put over the south window and leave it open in the winter or put a turbine vent on the flat roof? We live in Wisconsin on the ridge so it's coldand always breezy.