The typical lifespan of a residential air conditioning capacitor generally ranges from five to ten years, though several environmental and operational factors can cause it to fail much sooner. Capacitors are sensitive electronic components that store and release electrical energy to help start and run the compressor and fan motors. Constant exposure to extreme summer heat inside the outdoor unit cabinet accelerates the degradation of the internal dielectric fluid and plastic film. Additionally, power surges, lightning strikes, brownouts, and running with a dirty condenser coil that causes high operating pressures and elevated electrical current draws will significantly shorten a capacitor's operational life. Because capacitors are inexpensive and wear out frequently, HVAC technicians often recommend inspecting or replacing them proactively during routine annual maintenance visits to prevent unexpected breakdowns.
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