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Sizing a heat pump for Westchester starts with understanding exactly how long and how cold the heating demand runs. Homes in Westchester County, NY run heat about eight months a year, from October through May. A heat pump loses capacity as outdoor temperatures drop, so the coldest weeks of that stretch are what drive the sizing conversation, not the mild ones. A contractor who skips a proper load calculation leaves the backup heating element to cover whatever the heat pump cannot deliver, and backup resistance heat draws far more power than the heat pump cycle it is supplementing. Getting the primary unit sized correctly, and placing the backup threshold in the right place, is work that has to happen before equipment is ordered.

Ductwork and electrical panels are what decide how a heat pump installation goes here, and in a county where older stock dominates, the panel is often where the job gets complicated. Half the homes in Westchester County, New York were built in 1959 or earlier (2020-2024 ACS 5-year). Service panels put in for the original heating and cooling loads of that era were not sized for what a heat pump draws, and a contractor has to open the box and confirm capacity before the equipment choice is relevant. Ductwork in houses of that vintage carries its own questions about sizing and condition, but the electrical is where the scope and the cost tend to shift.
What Gets Installed With a New Heat Pump

The outdoor unit is the piece a homeowner sees first, mounted on a pad or bracket outside the house, and it holds the compressor and the coil that exchange heat with the outside air. Inside, an air handler sits in a utility space, attic, or closet and moves conditioned air through the home. Together those two units do the core work.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two through an exterior wall. A thermostat goes on an interior wall where it reads the home's temperature and tells the system when to run. A disconnect box gets mounted near the outdoor unit as the local shutoff point for the equipment.
The drawing shows a representative layout, and a licensed contractor determines exactly how each piece is positioned and connected in your home.
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
Heat pump performance is tied directly to what the local climate demands of it. Weather extremes drive the workload, and workload determines what equipment, sizing, and installation approach make sense for this area.
229 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.