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On a heat pump repair call in Pettis County, a contractor looks at the compressor and the reversing valve before quoting anything else. Homes in Pettis County, MO run heat about seven months a year, from October through April. Capacity drops as outdoor temperatures fall, so the compressor works harder in the coldest weeks than it would in a mild climate, and that load accumulates over years. The reversing valve, which switches the system between heating and cooling mode, cycles constantly through a long heating season and shows wear that a system in a shorter season simply does not accumulate. A contractor who skips those components on a diagnostic is likely to miss the failure that brought the call in the first place.

Ductwork laid down for a different system picks up decades of wear in ways that show up as reduced airflow, pressure loss, or uneven heating before the heat pump itself is ever the explanation. Half the homes in Pettis County, Missouri were built in 1974 or earlier (2020-2024 ACS 5-year). That age of construction means a contractor opening a repair call is working through what the ducts have accumulated, collapsed flex runs, separated joints, degraded insulation, before concluding that the heat pump unit is where the fault lives. Parts availability for the unit matters too, and a contractor checks that on the bench.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is usually where a contractor starts. It houses the compressor, which does the heavy work of moving refrigerant through the system, and the outdoor coil, which transfers heat between the refrigerant and the outside air. When either one fails, the whole system stops doing its job.
Inside the house, the air handler holds the indoor coil and the blower that pushes conditioned air through the home. Running between the two units, the refrigerant lines and the reversing valve direct flow depending on whether the system is heating or cooling. The reversing valve is a common point of failure when a heat pump blows the wrong temperature.
The drawing shows a typical heat pump layout, and a licensed contractor will determine which parts apply to your specific setup.
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94 severe weather events were recorded in Pettis County, Missouri 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 Pettis County, Missouri were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPettis County, Missouri holds 18,673 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 69.1% of the occupied homes in Pettis County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Pettis County
Extreme weather puts heat pumps under real strain, pushing the refrigeration cycle, the electrical components, and the cabinet itself harder than routine operation does. How often that pressure arrives in Pettis County shapes how much repair work local equipment needs.
94 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.