A typical residential split-system air conditioning unit or heat pump contains at least one primary dual-run capacitor housed inside the outdoor condensing unit, which simultaneously provides electrical starting and running torque to both the outdoor compressor motor and the outdoor condenser fan motor. However, depending on the specific equipment design, age, and configuration, some systems may also feature a separate standalone start capacitor paired with a potential relay to assist heavy-duty compressors, as well as an independent run capacitor or electronic module inside the indoor air handler or furnace for the variable-speed or standard blower motor. You can locate and count all capacitors by opening the service access panels of both indoor and outdoor units. You can verify your system's layout by reviewing the wiring schematic printed on the service panel.
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