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What are those strange noises my furnace is making?

Posted on: January 16, 2014
If you have an older furnace you’ve likely experienced a range of noises over the years, especially as the furnace nears the end of it’s lifespan. However, most newer gas furnaces are designed to operate very quietly. Here are some of the sounds you may hear from your furnace and what they could indicate:

Screeching Noises
If you hear a screeching noise coming from your furnace, it could be a problem with the motor, such as a worn bearing.

Pinging and Popping
Pinging or popping sounds often happen when the air ducts expand and contract and are usually nothing to worry about.

Vibrating or Whining Noises
This can indicate a problem with the furnace, such as a loose motor mount. The unit should be inspected by a heating technician.

Crackling Sounds
When the furnace shuts down the hot metal parts will often make a crackling sound as they cool down.

Booming sounds
Loud booming sounds may come from air ducts as they expand and contract during very cold weather, especially if your a basement is unheated. It can also indicate the furnace has dirty burners that should be serviced by a heating technician.

If any of these sounds are accompanied by a blower that is turning on and off more frequently or is blowing cool air, it may be time to call a heating technician to inspect the unit.

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