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A heat pump running in heating mode works hardest when outdoor temperatures drop, and in this county that cold stretch is long. Homes in Westchester County, NY run heat about eight months a year, from October through May. The reversing valve cycles between heating and cooling modes with every seasonal shift, and a system that handles both directions across that calendar accumulates wear on that valve and on the refrigerant connections in a way a single-mode system does not. A contractor diagnosing a repair here checks refrigerant charge and valve function early, because those are the components the season loads most directly.

Ductwork in a house this old has usually been modified more than once, and what those modifications leave behind is what a contractor opens a repair call into. Half the homes in Westchester County, New York were built in 1959 or earlier (2020-2024 ACS 5-year). That history means the duct runs a technician finds may have been sealed with materials that have since failed, re-routed around a renovation, or sized for a system the house stopped running years ago. A heat pump drawing through compromised ductwork will throw codes and lose efficiency in ways that point at the unit but originate elsewhere, and a contractor who pulls the equipment without checking the path first will price the wrong fix.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is where most repairs begin. It houses the compressor, which drives the whole system, and the coil that absorbs or releases heat depending on the season. When a heat pump stops conditioning air or runs but delivers nothing, the compressor and that outdoor coil are where a contractor looks first.
Inside the house, the air handler moves conditioned air through the home and contains the indoor coil and the blower motor. The expansion valve sits between the two coils and controls refrigerant flow. A refrigerant line set connects the outdoor and indoor units, and a leak or blockage anywhere along it affects everything downstream.
The drawing shows a typical layout, and a licensed contractor will assess which components and connections apply to your specific system and house.
Get matched in Westchester CountyWestchester County, by the numbers
229 severe weather events were recorded in Westchester 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 Westchester County, New York were built in 1959 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWestchester County, New York holds 394,358 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.8% of the occupied homes in Westchester County, New York (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Westchester County
Extreme weather puts real load on heat pump systems, and the harder a unit works to keep up, the more likely it is to need attention. How often that happens in Westchester shapes what local repair work looks like.
229 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.