The answer to 'why is my HVAC system making loud noise' is that there could be several common causes, including a worn-out component, loose parts, or a problem with the compressor. Loud noises from your HVAC system are often a sign of a mechanical issue that requires attention.
Some of the most common causes of loud HVAC noises include a failing compressor, worn-out fan motors, loose or broken parts, and problems with the ductwork. These issues can lead to grinding, squealing, or banging sounds that are impossible to ignore. In many cases, the noise is a warning sign of a more serious problem that could lead to a system breakdown if not addressed promptly.