Why AC is so much noisy?

Answer 1

• Rattling ‑ If you hear a rattling noise coming from an exterior AC unit, it could be because something fell into the vents, such as leaves, sticks, or other outdoor debris. A rattle could also indicate something as simple as loose bolts, screws, or fasteners. However, the sound could also be coming from the compressor. As the motor in the compressor begins to age, it may get louder and begin to make noises, which would be the first sign of a problem with it.

• Grinding ‑If you hear a grinding noise, it is most likely one of the fan motors. The noise usually signals that something might be going wrong with the fan motors, such as a worn bearing.

• Popping ‑Sometimes, you might hear popping noises in your ductwork, especially when the air cuts on and off. It actually is an issue with your ductwork rather than the central air conditioning unit. As ductwork ages, just as anything else, it may also require maintenance to make sure that nothing is faulty or damaged so that your AC unit can continue to effectively and efficiently cool your home.

• Hissing‑A hissing or whistling noise could also be due to a problem with ductwork. However, a hissing noise coming from the AC unit itself is often indicative of a refrigerant leak, which should only be handled by an HVAC professional.