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A heat pump running heat through winter is working its reversing valve and compressor hard, and both parts show the effects of repeated thermal cycling. Homes in Yolo County, CA run heat about six months a year, from November through April. By the time a fault appears, the compressor has been starting and stopping through months of cold, and a contractor checking it has to judge how much useful life remains, not just what broke this week. Worn valve seats and low refrigerant charge often surface together after a long heating season, so a technician who prices only the obvious fault may be back within the year.
Ductwork in a house this old has had time to collect what the equipment has pushed through it, and a heat pump repair that restores the unit itself can still leave a system underperforming if the ducts are carrying that load. Half the homes in Yolo County, California were built in 1983 or earlier (2020-2024 ACS 5-year). A contractor opening a system here checks whether restricted or leaking duct runs are the reason the unit was working harder than it should have been. If they are, the repair scope expands to include the ductwork, and the bill reflects that before any parts are ordered.
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. The compressor is the heart of the system, and when a heat pump stops moving heat the way it should, that is where a contractor looks first. The condenser coil wraps around it and is a common source of trouble when airflow is blocked or the coil is damaged.
Inside the house, the air handler pushes conditioned air through the home and contains the evaporator coil, the blower motor, and the expansion valve. The refrigerant lines run between the two units, and the reversing valve inside the system is what lets the heat pump heat and cool. A fault in any of these can look like the same symptom from the outside, so a contractor works through them to find the source.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines what applies to the specifics of your house.
Get matched in Yolo CountyYolo County, by the numbers
49 severe weather events were recorded in Yolo County, California 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 Yolo County, California were built in 1983 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesYolo County, California holds 82,447 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 54.3% of the occupied homes in Yolo County, California (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRepair Rules & Codes for Heat Pumps in Yolo County, California1 sourced standards and rules
Licensing Rules for HVAC Repair in Yolo County, California
California requires a state contractor license: it is a misdemeanour to engage in the business of, or act in the capacity of, a contractor in California without one, unless the work is exempt.
Severe Weather Events in Yolo County
Heat pumps work harder when outdoor conditions push to extremes, and that added strain shows up as wear over time. How often that happens in Yolo County shapes how much repair work local equipment actually sees.
49 severe weather events, 2016–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.