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What Causes My Ductwork to Pop When My Furnace Turns On or Off?

Arianne Large - Thursday, November 03, 2016
Technician getting out of van

Your heating and air conditioning system can make all sorts of noises, but what about those pops that come from your ductwork? There’s a reason for the sounds that come from your heating system. Here’s the lowdown:

The Pops from Your Ductwork

One of the most common things you hear from your ductwork are pops. This happens when the temperature of the metal changes as the hot air blows through on its way to being circulated throughout the house. The duct walls are flexible and they bend and “pop” as the air moves over them.

Rattling in the Ducts

Rattling is less common. This often occurs when the duct components are loose and knock against each other. This can happen more frequently as the ducts age and the joints and hardware loosen. This can be assessed and addressed with a proper inspection by a certified HVAC technician. 

Vibrating in the Ducts

If your ducts seem to be vibrating or shaking, it could indicate a blockage that could be from a dirty air filter. This causes a pressure drop in the vent system that results in shaking ducts. Cleaning or changing your air filter could solve this problem.

When the Ducts Go Boom

Inadequate vents or dampers can cause booming. If this is the case, the ducts make a booming sound from an abrupt change in temperature. It sounds especially loud because it echoes throughout the ductwork. The duct trunk connection needs to be evaluated and possibly repaired to fix the problem.

Your furnace can make a lot of interesting noises, but often it’s actually coming from your ductwork. For any issues with loud or unusual sounds that come from your heating and air conditioning system, contact the experts at Helms Heating and Air Conditioning right away.