A capacitor is a smart device made up of two metal conductors separated by an insulator. They resemble huge, cylindrical batteries with two or three posts protruding from the top of an air conditioner. Capacitors store electrons to supply start-up energy for your air conditioner, and they build up a charge by swapping electrons between the two conducting plates inside as electricity passes through them.
Air conditioners perform a magic trick every time they turn on thanks to their capacitors. Because your air conditioner requires far more start-up energy than is available through your home’s wiring, the capacitor is added to the circuit to provide an electrical jumpstart at the same time your air conditioner is drawing electricity from the grid.
These two electrical sources work together to give your air conditioner the proper amount of power. Until an air conditioning cycle is completed, the capacitor’s function is done. The compressor must then be restarted.
The initial jolt of power required by your air conditioner’s motors is provided by an AC capacitor. It stores electricity and sends it in forceful bursts to your system’s motors, revving up your unit as it begins the cooling cycle.
Your air conditioning system will not work as it should due to problems with the AC capacitor.