Definately get more quotes. 9kW is too small to do your floor space. even zoned its on the light side. look for a local supplier of actron air systems. hitachi systems are more complicated electronically than necessary. ie more links in the chain more possible weak ones. ive installed, serviced and repaired hitachi, daiken, actrons,mitzubishi elc,mhi, infact pretty much all of them. if i was to choose a ducted system for my house or anyones i would go with ACTRON AIR.