Hi, sorry for making this a little long I have a 2 families house in Brooklyn NY. The house is under complete renovation. I'm ready to make a decision on the Air conditioning unit. The house consists of 2 apartments. 1st fl and batsmen is one apartment and the 2nd apartment is 2nd fl and attic. Each floor is 1,100 SF for a total 2,200 sf for each apartment. I spoke to a few HVAC contractors and off course I get a few different answers. I would like each apartment to have 3 zones so I can save $$ on the long term. Do you recommend that I install two units per apartment or one unit with split zones. also do you recommend the split units( compressor & airhandeler) or one unit. even though i have a heating system i would like to use this as a back up heating ssystem. Thanks