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A heat pump in St. Louis city earns most of its wear in heating mode, not cooling. Homes in St. Louis city, MO run heat about seven months a year, from October through April. Cold outdoor air forces the compressor to work harder to extract heat, and as temperatures drop toward freezing, the refrigerant circuit cycles harder still. The reversing valve, the defrost board, and the low-pressure side of the compressor all carry that load month after month. When a contractor opens a system here with a heating complaint, those are the components that show the history of the season in cracked contacts, worn valve seals, and stressed refrigerant lines.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits outside the house and holds the compressor and the condenser coil. These are where most failures show up. A contractor will check the compressor for electrical faults and refrigerant pressure, and inspect the coil for damage or blockage that keeps the system from moving heat properly.
Inside, the air handler holds the evaporator coil and the blower fan, usually in a closet, basement, or utility room. The refrigerant lines run between the two units, and the reversing valve inside the system controls which direction the cycle runs. Any of these can be the source of a heating or cooling complaint.
The drawing shows a typical layout, and a licensed contractor will determine which components apply to your specific system and home.
Find a contractor in St. Louis citySt. Louis City by the Numbers
54 severe weather events were recorded in St. Louis city, 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.St. Louis city, Missouri holds 174,111 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 45.3% of the occupied homes in St. Louis city, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in St. Louis city, Year by Year
St. Louis weather puts real stress on heat pump systems, and that stress accumulates over time. Repair demand follows local conditions, so the load this area places on equipment is part of what shapes the work a contractor does here.
54 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.