What causes a capacitor to fail?

Ac Capacitor

As you can imagine, they're susceptible to wear and tear. They're also extremely sensitive to overheating. They can even become damaged by regular power surges and short circuits.

When a capacitor fails, you should expect to see these symptoms in your home:
Your HVAC unit won't start the cooling cycle and won't give you cold air. It's also likely to be using more energy than usual, resulting in higher electric bills. This could be due to a failing capacitor, so be sure to call for repairs right away.