Customer currently has a 2 zone system (tstat upstairs and one Downstairs ) it's a 5 ton upflow heatpump with a closet door opening of 30" . The current honeywell zone board is working fine and can be kept . Also the 46x32 slab is in good condition . Condenser is on right side of house with no gate or fence (easy access) air handler is up the stairs in first door. I also filled at a pre I stall form