From Musty to Burning: Identifying Different HVAC Smells

You need a heating, ventilation, and air conditioning (HVAC) system to sustain a comfortable indoor environment. However, when these systems emit unusual smells, it can be an indication of underlying issues that need to be addressed. 

Identifying the different smells associated with HVAC systems can help homeowners and facility managers diagnose and fix issues before they become serious. Read on to learn how to spot these irregular odours.

Musty Smell

A musty or mouldy smell is a common issue with HVAC systems, especially those that have not been maintained or cleaned regularly. This smell can be caused by mould or mildew growth within the ductwork or on the evaporator coil. 

It can also signify a clogged air filter or a malfunctioning condensate drain. If left unaddressed, this smell can pose a health risk to occupants, especially those with allergies or respiratory issues.

Burning Smell

A burning smell coming from the HVAC system can be a sign of a serious concern that requires immediate attention. It can indicate an electrical issue, such as a burnt-out motor or wiring problem. 

It can also be caused by overheating components, such as the blower motor or transformer. If this smell is detected, the HVAC system should be shut off immediately, and a professional should be called to inspect and repair the issue.

Oil Smell

If the HVAC system is the source of the oil odour, your property may have a problem. The reason for this is that the oil needs to be poured into the system. 

The compressor, evaporator, and condenser should then be circulated with it to keep them operating properly. You’ll smell a stench if any of these components are leaking or damaged.

Rotten Egg Smell

A rotten egg smell coming from the HVAC system can be a sign of a gas leak. Natural gas is odourless, but an additive called mercaptan is added to give it a distinctive smell. 

If this smell is detected, the HVAC system should be turned off immediately, and the gas supply should be shut off at the main valve. A professional at Legacy Heating & Cooling should be called to inspect and repair the gas leak.

Sulphur Smell

A sulphur smell emanating from the HVAC system can be a symptom of a problem with the AC. This smell can indicate a refrigerant leak, which can pose a health risk if inhaled. 

Refrigerant leaks can also cause the HVAC system to malfunction and lead to costly repairs. If this smell is detected, a professional should be called to inspect and repair the issue.

Chemical Smell

An issue with the air filter may be indicated by a chemical odour coming from the HVAC system. This smell can be caused by volatile organic compounds (VOCs) that are released from the filter when it becomes dirty or clogged. 

It can also be a cue for a malfunctioning air purifier or humidifier. If this smell is detected, the air filter should be replaced immediately, and the HVAC system should be inspected to determine if any other components need to be repaired or replaced.

Conclusion

Identifying the different smells associated with HVAC systems is essential for maintaining a safe and comfortable indoor environment. If any unusual smells are detected, homeowners and facility managers should take immediate action to diagnose and fix the issue. 

Regular maintenance and cleaning of HVAC systems can also help prevent these issues from occurring in the first place. By staying vigilant and addressing issues promptly, homeowners and facility managers can ensure that their HVAC systems are running efficiently and safely.

Legacy Heating delivers excellent HVAC repair in Edmonton and Calgary! We specialize in HVAC systems and the replacement of furnaces as well as other HVAC products. Call today to have your HVAC system checked!