Thanks for the info.
But as I had mentioned above, DUCTED system costs $6K in supply.
I wonder how much does ducted installation labour costs for a 2 storey house.
But certainly not $15K.
The unit itself might cost $6k, but that doesn't cover ductwork, vents, electrical, zone controllers, control panels, gas, wiring, etc, nor does it include an installation warranty. Buying something like this isn't a case of just chucking the parts in a corner and plugging them in, so the cost of the core unit is only a small part of the puzzle. The Daikin units you linked to aren't full systems, they are just the indoor and outdoor unit.
My system took a day and a half for four professionals to install, two of which had undergone extensive training to be able to do this kind of work. I don't think it's a reasonable expectation that the wholesale cost of the hardware is going to be the final cost.
The cost of ductwork, vents, zone controllers, control panels all together sum up to let's say another $2K for the 2 storey house with 8 zones.
12 hours of work by 4 professional installers, let's say at $60/hr, is another $3k.
There is still ~$10K missing from the equation.