We are building a 6x4.25 coop for 4 chickens and we built it attached to a 12x12 shed (no access into shed however, the walls just abut eachother). The coop is 4 feet tall. I need to add some ventilation but i live in MA so id also like to keep the coop as warm as possible in the winter. Im afraid roof level vents will blow onto the roost. We currently have 2 screened windows with shutters for cold weather. Would installing a large vent on the shed-side wall that opens into the shed help them at all with ventilation given the small number of birds, and the size of the adjacent shed?