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A heat pump here runs as a heating system far longer than it runs as a cooling one. Homes in Montgomery County, MO run heat about seven months a year, from October through April. Outdoor temperatures during those months push the compressor and reversing valve through thousands of cycles, and both components carry the bulk of that load. When a heat pump fails in this county, a contractor checks the reversing valve, the refrigerant charge, and the compressor windings before looking elsewhere, because that is where the accumulated heating-season wear lands first.

Half the homes in Montgomery County, Missouri were built in 1978 or earlier (2020-2024 ACS 5-year). A heat pump running in a house built around that period has likely worked through insulation that has thinned, coil housings that have weathered, and refrigerant lines that carry the record of at least one earlier repair. When a contractor opens the unit, those are the conditions that shape what the job actually costs and how long the fix holds. Parts availability matters too: equipment old enough to match the house it sits in draws from a shorter supply list, and a contractor sourcing components for it is not pulling from the same shelf as a newer system.
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 condenser coil. These are the pieces a contractor reaches first when a heat pump loses heating or cooling capacity, since the compressor is the system's workhorse and the coil is where heat actually moves in or out of the refrigerant.
The indoor air handler mounts inside, often in a closet, basement, or utility space, and contains the blower motor and the evaporator coil. The refrigerant lines connecting the two units, along with the reversing valve that tells the system which direction to run, are also points a contractor checks when the system behaves differently in heating mode than in cooling mode.
The drawing shows a typical heat pump layout, and a licensed contractor determines which components are involved based on what they find in your specific home.
Find a contractor in Montgomery CountyMontgomery County, Missouri, by the numbers
59 severe weather events were recorded in Montgomery 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 Montgomery County, Missouri were built in 1978 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMontgomery County, Missouri holds 5,832 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.4% of the occupied homes in Montgomery County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Montgomery County
Extreme weather puts heat pumps under load they were not sized to absorb on a calm day. Repair demand in Montgomery County follows that pattern, which makes local weather history a practical reference for any homeowner weighing service decisions.
59 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.