Hi Jes
3+1 = 3 Blower and 1 Invertor/Non Invertor
$2600 inclusive of KFLEX piping isulators and installation.
Brand: Mitsubitshi Heavy Industries.
*Please take note, not to confused anyone, Mitsubitshi Heavy Industries is different from Mitsubitshi Electric.
1) Mitsubitshi Heavy Industries is originally for commercial business but the went into non-commercial business only in 2000 *based on website
2) Mitsubishi Electric StarMex is a non-commercial system for home.
If you compared side by side of the similar system (3+1 invertor), Mitsubishi Electrical StarMex will be $400 more expensive due to the fact they advertise heavily. And yes again, both have nothing in common. I have being to like 3~4 aircon installers... most of them will prefer to sell you Sanyo, Mitsubitshi Electric, Panasonic, Toshiba, Samsung for the higher profit.
PS: I might be wrong. My system might fail or burned our only after a year... hehehe