Vertical three loop ground source; 4 ton 2-stage GSHP for 1st floor and basement with propane emergency heat; 3 ton 2-stage GSHP for 2nd floor. Monitors are air temps and thermostat calls for heat pump 1st floor (stage 1, stage 2, Eheat and fan).
Feb 2019: Install 55 photovoltaic 300 watt panels with IQ7 microinverters