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On a repair call, a contractor looks at the refrigerant circuit and the defrost board before anything else in this county. Homes in Burlington County, NJ run heat about seven months a year, from October through April. Across those months, a heat pump runs in its hardest mode: outdoor temperatures drop, capacity falls, and the defrost cycle kicks in repeatedly to keep the coil clear. That cycling loads the reversing valve and the defrost controls in ways that a mild or short heating run never would. When one of those parts gives out, the system either loses its ability to move heat or locks into defrost and stays there.

Half the homes in Burlington County, New Jersey were built in 1977 or earlier (2020-2024 ACS 5-year). A heat pump running in a house from that era has almost certainly been replaced or heavily serviced at least once, but what surrounds it, the line sets, the air handler connections, the original wiring pathways, reflects choices made for equipment that no longer exists. When a contractor opens a unit here and finds a failed reversing valve or a compressor at end of life, the next question is whether the replacement part still has a current manufacturer, or whether the repair becomes a sourcing problem before it becomes a mechanical one.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is the piece most homeowners recognize. It holds the compressor, which pressurizes the refrigerant and is the most common source of a heat pump failure, and the outdoor coil, which transfers heat to or from the air outside. When the system runs but heats or cools poorly, these are where a contractor looks first.
The air handler sits inside the house, usually in a utility closet, attic, or basement. It contains the indoor coil and the blower that moves air across it. The refrigerant line set runs between the two units, and the reversing valve inside the outdoor unit is what allows the system to shift between heating and cooling. A fault in the valve shows up as the system doing only one or neither.
The drawing shows a typical layout, and a licensed contractor determines which parts and conditions apply to your specific system.
Get matched in Burlington CountyBurlington County, by the numbers
514 severe weather events were recorded in Burlington County, New Jersey 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 Burlington County, New Jersey were built in 1977 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesBurlington County, New Jersey holds 186,315 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.1% of the occupied homes in Burlington County, New Jersey (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Heat Pump Repair in Burlington County, New Jersey2 sourced rules & standards
Licensing and Legal Requirements in Burlington County, New Jersey
In New Jersey the HVACR licence is the State's alone: a municipality, local board of health or any other agency may not issue or renew a Master HVACR contractor's licence.
New Jersey requires a Master HVACR contractor licence: no person or business may engage in the business of HVACR contracting, or advertise as a Master HVACR contractor, without being authorised under the State HVACR Contracting License Law.
Severe Weather Events in Burlington County
Heat pump systems work harder and wear faster when outdoor conditions swing hard. Burlington County's weather record shapes how much strain local equipment carries, and that strain is what repair work addresses.
514 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.