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A heat pump here earns most of its hours in heating mode, which is where the compressor works hardest and the reversing valve cycles most. Homes in Garrett County, MD run heat about nine months a year, from September through May. Cold outdoor air forces the system to extract heat from a thin source, and that sustained demand is what the compressor has already absorbed by the time something fails. A contractor pulling a repair call in this county looks at the compressor, the reversing valve, and the refrigerant charge before anything else, because those parts carry the load of the heating season rather than the cooling one.
Heat pump systems in much of this county sit inside shells that were built for something different and adapted over the years since. Half the homes in Garrett County, Maryland were built in 1982 or earlier (2020-2024 ACS 5-year). When a technician opens the unit, what matters is whether the refrigerant circuit and associated electrical work were done to the equipment's spec or fitted around what was already in the house. Parts for a system running in stock like this are not always a straightforward order, and a contractor has to confirm availability before committing to a repair path.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits on a pad beside the house and holds the compressor and the condenser coil. The compressor is the heart of the system, and when a heat pump stops heating or cooling, a contractor starts there. The condenser coil wraps around the inside of that cabinet and is another early stop when performance drops.
Inside the house, the air handler moves conditioned air through the home and contains the evaporator coil and the blower motor, either of which can be the source of airflow or temperature problems. The reversing valve, also inside the refrigerant circuit, is what lets a heat pump work in both directions, and a failed one often looks like a system stuck in the wrong mode. The expansion valve sits between the two coils and controls refrigerant flow.
The drawing shows a typical layout, and a licensed contractor determines what applies to this particular house and system.
Get matched in Garrett CountyGarrett County by the Numbers
74 severe weather events were recorded in Garrett County, Maryland 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 Garrett County, Maryland were built in 1982 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGarrett County, Maryland holds 18,642 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.7% of the occupied homes in Garrett County, Maryland (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Heat Pump Repair in Garrett County, Maryland1 sourced rules & standards
Licensing Rules for HVAC Repair in Garrett County, Maryland
Maryland requires a state licence before an individual provides, or assists in providing, heating, ventilation, air-conditioning or refrigeration services.
Severe Weather Events in Garrett County, Year by Year
Weather puts a load on heat pumps that steady indoor temperatures cannot fully show. How hard a system works over its life is partly a local story, and the record of weather events in Garrett County is part of that story.
74 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.