Is it at all common practice to use the any of the various Asian built multi split units as we use heat pumps. That is: installed as an integrated system with full duct work.
Each of the manufacturers have what they call ducted air handlers, but they are different is shape and size from the typical American setup. It seems like with a little transition duct work the return and supply ducts that many homes have could be reconfigured to work with these air handlers. Adding supplemental and emergency heat would some how need to be figured out. Maybe they have that too and Ive just missed it.
If this would work then using a single condensing unit with multiple air handlers would be possible which would be a plus for the many homes that have two systems (or more) typically one up and one down. These systems have all the bells and whistles one could imagine of a climate control system. The controls are very sophisticated. Plus, it seems like they could be sized for the heat load in order to not rely on strips or other supplemental heat.