How many years will a capacitor last?

A residential HVAC dual-run or start capacitor typically lasts between five and ten years under normal operating conditions, though its lifespan can vary significantly based on environmental factors and usage intensity. Capacitors are sensitive electronic components that store and release electrical energy to jumpstart compressor and fan motors; constant exposure to extreme summer heat inside outdoor condensing units or unconditioned attics accelerates the degradation of internal dielectric fluid and film. Additionally, frequent electrical power surges, brownouts, and cycling strain can shorten a capacitor's lifespan dramatically. You can test capacitor health periodically using a digital multimeter equipped with a microfarad setting. You can verify that a capacitor is failing when its measured capacitance drops more than ten percent below its rated microfarad value.