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The refrigerant circuit in a heat pump works under heating demand from October through April, which means the reversing valve cycles between modes twice a year and the compressor runs through cold months when its capacity is already stretched. Homes in Mississippi County, AR run heat about seven months a year, from October through April. A contractor diagnosing a heat pump here looks at the reversing valve and the low-ambient performance of the compressor before anything else, because those are the parts this heating season punishes first. Wear on the coil and refrigerant charge show up in the repair history of systems that have carried that load without a seasonal check.
Stock this old was ducted and wired for equipment that manufacturers stopped making long before the units running in these houses today were installed. Half the homes in Mississippi County, Arkansas were built in 1977 or earlier (2020-2024 ACS 5-year). That gap matters on a repair call because what a contractor finds inside an opened heat pump determines whether the part it needs is a current catalog item or a discontinued one that has to be sourced separately, at a longer lead time and a higher price.
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 one set of coils. The compressor is where most repair calls start. When it runs poorly or not at all, the whole system loses its ability to move heat in either direction. The coils inside that cabinet are the other early suspect, since bent fins or dirt block the exchange and put strain on everything else.
Inside the house, the air handler sits in a closet, attic, or mechanical room and pushes conditioned air through the home. It contains a second set of coils and a blower motor, both of which a contractor will check when the outdoor unit looks sound. The reversing valve, which sits inside the outdoor cabinet, is what allows a heat pump to switch between heating and cooling, and a failed valve is a common reason a system works in one mode but not the other.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which parts and conditions apply to your specific house.
Find a contractor in Mississippi CountyMississippi County, Arkansas, by the numbers
126 severe weather events were recorded in Mississippi County, Arkansas 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 Mississippi County, Arkansas were built in 1977 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMississippi County, Arkansas holds 19,133 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 60.0% of the occupied homes in Mississippi County, Arkansas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards for Heat Pump Repair in Mississippi County, Arkansas2 sourced regulations and codes
What Mississippi County, Arkansas Requires for HVAC Repair Work
An Arkansas HVACR licence is good across the state: no city or county may require its own licence to do HVACR work, though local permits and inspections still apply.
Arkansas requires an HVACR licence or registration: it is unlawful to do HVACR work without the appropriate one unless the chapter exempts you.
Severe Weather Events in Mississippi County
Extreme weather puts heat pumps under stress, and Arkansas weather does not spread that stress evenly across the state. How hard the equipment in Mississippi County works, and how often it needs repair, is shaped by what this county's climate actually delivers.
126 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.