We currently have two areas of ventilation on our coop: three vents just below the roof, pictured below, as well as a roof ridge vent. We are thinking about blocking the lower three vents during wintertime, as it might be too drafty right where our girls are roosting. This picture might give you a good idea: The roof ridge vent would be the only source of ventilation... is this a bad idea? We live in Northern AZ, where temps can get in the single digits at night, but usually stay in the 20's. Thanks for any advice... this is our first winter with chickens.