Marketing InformationIf an AC capacitor fails, the air conditioner may not start, blow warm air or make a humming noise. A bad capacitor can also cause frequent cycling and emit a burning smell. These bad capacitor symptoms indicate the need for an HVAC capacitor replacement, such as this ProTech® air conditioner capacitor, to prevent further damage. The ProTech single oval capacitor is tested to the highest standards for safe and reliable performance and is competitively sourced to bring you high quality at the best possible price. To ensure optimal performance, install a capacitor for AC use with correct specifications for your AC units.