Park City Heat Pump Retrofit

The brief

A 4,200-square-foot contemporary in Park City, originally heated by an aging propane furnace and cooled by a single-stage central AC. The owners wanted a system that would handle Park City’s deep winters without the propane bill, run quiet enough for the open-plan living room, and let them zone the lower level independently from the bedrooms.

The approach

We ran a Manual J on the home and proposed a Mitsubishi Hyper-Heat outdoor unit paired with a ducted air handler for the bedrooms and three wall cassettes for the open-plan main floor. The Hyper-Heat platform holds full capacity down to -13°F — well below Park City’s design temperature.

The install

Five days, two-person crew. We routed the line set through an existing chase to avoid touching the cedar facade. The outdoor unit sits on a sound-isolation pad, set back from the deck so it doesn’t read visually. Indoor cassettes are placed for airflow, not the easiest stud bay.

The result

The home holds 70°F on the coldest morning of the year on heat-pump heat alone. Propane is now a backup, not a primary. The owners report the upstairs is quieter than it was with the old central system — even running.