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A heat pump running heat through a Mississippi winter puts its reversing valve, refrigerant circuit, and outdoor coil through repeated cycling under cold-air conditions, and those are the parts that show wear first when something goes wrong. Homes in DeSoto County, MS run heat about five months a year, from November through March. A contractor called out for a repair here looks at the reversing valve early, because that component switches direction every heating cycle and is the first place a hard season shows up in a heat pump. The outdoor coil gets checked too, since it has to pull heat from cold outside air the whole time the system is in heating mode, and a refrigerant charge that was slightly off going into winter is usually well off by the time the homeowner calls.
A heat pump sitting in a house this age has almost certainly been replaced at least once since the house was built, which means the refrigerant lines, electrical connections, and disconnect boxes around it were sized and run for something that is no longer there. Half the homes in DeSoto County, Mississippi were built in 1999 or earlier (2020-2024 ACS 5-year). When a contractor opens the current unit, what they find is equipment that was retrofitted into a space shaped for its predecessor, and the wear patterns on the components reflect that history. Parts availability for the units that filled this gap in the county's housing stock is the variable that decides whether a repair closes in one visit or stretches into a sourcing problem.
The Parts of a Heat Pump a Contractor Checks During Repair
The outdoor unit is where most repairs begin. It houses the compressor, which drives the whole system, and the coil that either pulls heat from the air or releases it, depending on the season. When a heat pump stops doing its job, the compressor or that coil is often where the fault sits.
Inside the house, the air handler holds a second coil and the blower that moves conditioned air through the home. The reversing valve, which tells the system which direction to run, connects the two sides and is a common point of failure when a heat pump heats but will not cool, or vice versa.
The drawing shows a typical layout, and a licensed contractor will determine which components apply to your specific system and what work each one needs.
Find a contractor in DeSoto CountyDeSoto County, by the numbers
99 severe weather events were recorded in DeSoto 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 DeSoto County, Mississippi were built in 1999 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDeSoto County, Mississippi holds 75,437 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.9% of the occupied homes in DeSoto County, Mississippi (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRepair Rules for Heat Pumps in DeSoto County, Mississippi1 sourced rules and codes
Licensing Rules for HVAC Repair in DeSoto 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.
Severe Weather Events in DeSoto County
Weather in DeSoto County puts real stress on heat pump systems, which run year-round and respond directly to outdoor conditions. How hard that equipment works, and how often it needs repair, is shaped by what the local climate delivers.
99 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.