I'm not sure where the thread went, but there was some talk about the efficiency of the Inverter Technology being unique to mini-splits.
Well, now I have stumbled across this little jewel:
First Mitsubishi modulating ground source heat pump installation in Guernsey
Quote:
System to be commissioned in two weeks time, the main controller, a Dataterm intelligent heating control will match the high efficiency of the Mitsubishi GSHP, making it the most efficient ground source heat pump package available in the world.
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Thought you'd be interested.
-AC_Hacker