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A heat pump working through a cold upstate winter is asking its refrigerant circuit, its reversing valve, and its compressor to do something a cooling-only system never faces: extract heat from air that keeps dropping toward freezing and below. Homes in Ontario County, NY run heat about eight months a year, from October through May. Contractors diagnosing a failed heat pump here look at the reversing valve and low-pressure side first, because those are the components the heating load grinds on. Capacity loss that shows up as a complaint in February usually traces back to wear the system accumulated across prior winters, not to a single event.

Most of the heat pump repairs a contractor works through here come down to two questions: what the opened system actually contains, and whether the parts it takes are still being made. Half the homes in Ontario County, New York were built in 1976 or earlier (2020-2024 ACS 5-year). A house that old was built around something else entirely, and the heat pump running in it arrived later, which means the system a contractor opens may reflect a retrofit history rather than a clean original install. Capacitors, reversing valves, and control boards in a unit installed into older stock carry more service history than the house age alone suggests. That history is what determines the repair bill.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits on a pad beside the house and holds the compressor, the refrigerant coil, and the fan that pulls air across it. When a heat pump stops heating or cooling properly, the compressor and the outdoor coil are where a contractor looks first. A failed compressor means no heat transfer at all; a dirty or damaged coil means reduced capacity that can read as almost any symptom.
Inside the house, the air handler contains the indoor coil, the blower motor, and the filter. The refrigerant lines connect the two units and run through the wall or along the exterior. The reversing valve, which sits inside the outdoor unit, is the part that switches the system between heating and cooling modes, and a faulty one is a common source of a heat pump that works in one direction but not the other.
The drawing shows a typical layout, and a licensed contractor determines exactly which components apply to your home and situation.
Get matched in Ontario CountyOntario County, NY, by the numbers
225 severe weather events were recorded in Ontario County, New York between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Ontario County, New York were built in 1976 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOntario County, New York holds 53,379 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.7% of the occupied homes in Ontario County, New York (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Ontario County, Year by Year
Heat pumps in Ontario County work against whatever the local climate brings, and that workload is not uniform from year to year. Repair demand follows weather, so the history below is part of the picture for any homeowner deciding when and how to service their equipment.
225 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.