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On a heat pump repair call in Marshall County, a contractor starts with the compressor and the reversing valve before anything else. Homes in Marshall County, MS run heat about seven months a year, from October through April. Heating is the hard half of a heat pump's year: outdoor temperatures pull the system's capacity down, so the compressor works harder and cycles more often than it does in cooling mode. Wear on the reversing valve and the compressor accumulates there, not during summer. A repair quote that skips those parts first is missing where the hours went.
Ductwork put in for one generation of equipment does not automatically suit what runs through it now. Half the homes in Marshall County, Mississippi were built in 1992 or earlier (2020-2024 ACS 5-year). A heat pump that has been swapped into an older house sits inside a duct system that was never sized or sealed for it, and when a repair call comes in, a contractor opening the unit often finds that the duct losses and the leakage points are doing as much damage as whatever failed. The mechanical failure is real, but so is what surrounds it.
The Parts of a Heat Pump a Contractor Checks During Repair
The outdoor unit is the piece most homeowners recognize, a metal cabinet that sits on a pad beside the house. Inside it, the compressor pressurizes refrigerant and the condenser coil exchanges heat with the outside air. When a heat pump stops heating or cooling, both are early suspects. The condenser fan, which pulls air across that coil, is another.
Inside the house, the air handler holds the evaporator coil and the blower that moves conditioned air into your living spaces. The refrigerant lines connect the two units, and the reversing valve, which tells the system whether to heat or cool, sits within the outdoor cabinet. A contractor working through a repair will check the expansion valve as well, since it meters refrigerant flow between the coils.
The drawing shows a general layout of how these components relate, and a licensed contractor will assess exactly which parts apply to your specific system and situation.
Find a contractor in Marshall CountyMarshall County by the Numbers
60 severe weather events were recorded in Marshall County, Mississippi 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 Marshall County, Mississippi were built in 1992 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMarshall County, Mississippi holds 15,519 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.1% of the occupied homes in Marshall County, Mississippi (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Repair Rules for Marshall County, Mississippi1 sourced rules and standards
Licensing and Legal Requirements in Marshall County, Mississippi
Mississippi licenses residential HVAC work at every tier and at any price: a subcontractor of any tier doing heating, ventilation or air conditioning work on a residential construction or improvement project must be licensed by the State Board of Contractors no matter the dollar amount.
Weather Stress on HVAC Equipment in Marshall County
Heat pumps work against outdoor conditions year-round, and what the weather does here shapes how hard that work gets. Repair demand in Marshall County follows the same pattern the local climate sets.
60 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.