Looking for a mechanical contractor who services Fargo ND for a ducted cold climate heat pump retrofit, survey and preliminary design already done

A homeowner in Fargo, North Dakota is renovating a 1904 house and wants to replace part of its heating with a cold-climate heat pump, a type of electric heating and cooling system designed to keep working efficiently even in very cold weather. A helper (not a contractor) put together a detailed survey and preliminary design for the project, then posted online looking for a mechanical contractor in the Fargo area who can take over, run the official calculations, pick the equipment, and do the installation.

The plan covers the main floor and upper half story of the house, about 1,205 square feet, plus a basement and small crawl space that will keep using the existing gas furnace at a low temperature. The heat pump would use ducts run entirely inside the heated part of the house, with a backup electric heating element for the coldest days. A separate ventilation system, called an ERV (energy recovery ventilator), which brings in fresh air while recovering heat from air being exhausted, is already chosen and won't connect to the heat pump ductwork. The preliminary numbers suggest a system around 1.26 tons of cooling capacity, though the exact heat loss through gaps and cracks in the house isn't confirmed yet since no blower-door air-leakage test has been done.

Two equipment options are being weighed, a Bosch model and a Carrier model, with some unresolved paperwork and performance questions still open. This is a homeowner's individual project rather than a broader program or policy change, but it offers a real-world example of what planning a ducted cold-climate heat pump retrofit for an older home involves.