Very interesting and HANDY Spook!
My building has 2 normal size walk in (one at each end, north and south) doors w access to outside runs (like a kennel kinda) plus we have a full ventalation ((SP)) system. It's heated and cooled, but most of the time I open the vents and screen doors in winter and use the lights, then close it up during night. When we are in the single digits, vents/fans are all I use. There is always circulation of some kind going. I dont use it dueing summer months except for my birds who cant handle heat. Rest of year it sits

