The answer to 'air handler making loud noise' is that there are several common causes, including a worn-out blower motor, a malfunctioning fan, or a problem with the ductwork. Loud noises from an air handler can indicate a serious issue that requires professional attention.
Some key signs of an air handler problem include grinding, rattling, or screeching sounds, as well as increased vibration. These issues can be caused by worn bearings, loose components, or debris buildup. It's important to address the problem quickly to prevent further damage and ensure your HVAC system continues to operate safely and efficiently.