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A heat pump repair here starts with what the heating side has been carrying. Homes in New Castle County, DE run heat about seven months a year, from October through April. Through those months, the compressor cycles hard: outdoor temperatures fall, capacity drops, and the unit runs longer runs to hold indoor temperature. The reversing valve switches direction every time the system shifts mode, and in a county where heating dominates, that valve logs more movement than most homeowners expect. A contractor assessing a fault checks the refrigerant charge and that valve early, because those are the components the heating load wears.

Half the homes in New Castle County, Delaware were built in 1975 or earlier (2020-2024 ACS 5-year). A house built that long ago was ducted and wired for equipment that has since been replaced at least once, and what those original connections look like once a contractor opens the system is rarely what the fault code predicted. Refrigerant line insulation degrades. Junction connections oxidize. The gap between the failure the thermostat reported and the repair the contractor actually prices gets decided by what that opened system physically holds, not by the diagnostic read that started the visit.
The Parts of a Heat Pump a Contractor Checks During Repair

The outdoor unit is the piece most homeowners recognize first, a cabinet sitting on a pad beside the house that holds the compressor and the outdoor coil. The compressor is the part that does the hardest mechanical work, and it is also one of the first things a contractor looks at when the system is not keeping up. The outdoor coil, wrapped around the inside of that cabinet, is another common source of trouble when airflow or heat transfer has broken down.
Inside the house, the air handler holds the indoor coil and the blower fan, and either of those can be the reason a repair call happens. The reversing valve, which sits inside the outdoor unit, tells the system which direction to run, and a fault there can make a heat pump behave strangely in ways that are easy to misread. The thermostat and the refrigerant lines connecting both units round out what a contractor works through during a diagnosis.
The drawing shows a typical layout, and a licensed contractor determines which components apply to your specific system and what repair each one needs.
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274 severe weather events were recorded in New Castle County, Delaware 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 New Castle County, Delaware were built in 1975 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesNew Castle County, Delaware holds 236,079 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 69.0% of the occupied homes in New Castle County, Delaware (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRepair Rules for Heat Pumps in New Castle County, Delaware1 sourced rules and standards
Licensing and Legal Requirements in New Castle County, Delaware
Delaware requires a state licence to provide HVACR services, and forbids holding yourself out as a master HVACR licensee without one.
Weather Stress on Heat Pumps in New Castle County
Severe weather puts real load on heat pump systems. How hard that equipment works to recover, and how often it needs repair, depends on what the local climate actually delivers.
274 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.