This Is Why Your HVAC System Is Making a Noise

Unusual sounds coming from a heating or cooling system should never be ignored. While some noises are harmless, others may indicate developing mechanical faults that can lead to expensive repairs if left unresolved.

Common HVAC Noises and Their Causes

Squealing or screeching noise usually indicates that a fan belt is worn and needs to be replaced or that the motor requires lubrication. A buzzing noise could be due to something loose, low refrigerant or a fault with the compressor. Rattling or banging noises are generally caused by broken parts within the unit.

The typical sound of popping in heating ducts is due to the duct work metal expanding as warm air is introduced into the system. The occasional occurrence of such sounds in inactive duct work is of little concern. However, repeated popping sounds in other duct work locations may require further investigation.

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When Professional Attention Is Needed

Some sounds are more urgent than others and even potentially hazardous for you and your family. Hissing sounds could be caused by a refrigerant leak or a loss of air in the system. Frequent clicking from a furnace or air conditioner may point to ignition or electrical issues that should not be ignored.

A booming sound during furnace start-up can sometimes occur when delayed ignition allows gas to build up before lighting. High pitched screaming from an outdoor compressor may also indicate dangerous refrigerant pressure levels.