I have a 13 x 20' Florida Room that has mult skylights and windows, plus a cathedral ceiling that has always been hard to cool. I am considering a new central system heat pump for the whole house with new upgraded duct work and possibly zoning. I neighbor suggested a PTAC as on oasis for the Florida Room, which I have looked into but the units are rather large at 42" long and about 12-15" high and they all use 220V. Does anyone make a more compact and slimmer PTAC that uses 110V or would the size of the room require a larger unit? How efficient are these PTAC and do any approach the efficiencies of the mini-splits?