Another Mitsu HyperHeat
Bit the bullet and purchased a 2.5 ton HyperHeat H2i for my daughter's condominium adjacent to mine.
My identical HyperHeat with closet-mounted SVH air handler went through the entire Midwest US winter this year without using its resistive heat kit. That included some -5F mornings.
The HyperHeat installed today (5/19/26) is a R-454 system rather than the R-410 one installed 18 months ago on my condo. These systems appear to be outwardly identical.
I preinstalled the wiring before the HVAC contractor arrived. I included the three 14AWG conductors that are required to backfeed power and signalling from the outdoor unit to the air handler. This power/signalling back feed loop was contained in the same conduit as the 240VAC/30amp power leads to the outdoor unit.
The installing HVAC tech nixed my in-the-conduit power/signalling loop in favor of a separate 14AWG/4 conductor power/signalling flex cable that he taped to the copper line set.
I asked why the separate power/signalling loop, and he replied that Mitsu prefers that the power/signalling loop be isolated physically and electrically from the 240VAC/30 amp loop that powers the outdoor unit. He noted that I shared the 10AWG grounding conductor between the these two loops.
I questioned the durability of his taped-to-the line set power/signalling loop due to its exposure to UV in sunlight, but in the end I relented.
Installation happened in about 12 man-hours of labor. Total project cost to me was US$12.5k and included hand building some warm air plenum ducting above the air handler, MHK-2 thermostat, and an AprilAire passive air filter rack.