I am starting an art studio (one room, 604 sq/ft) that will need a way to push the fumes out and draw in fresh air. One wall is comprised of windows, so we're hoping a window HRV/ERV might work. We're doing this on a bootstrapped budget of less than $1,000. The layout of the room is attached (wall of windows facing courtyard). Does anyone have a recommendation for a window HRV/ERV that doesn't break the bank?