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Why Does My Furnace Make a Loud Noise When It Turns Off?

Posted On: September 30, 2013

Is your furnace making a loud noise when it turns off? Loud banging or thumping sounds after heating systems turn off is a common occurrence and it is usually nothing serious.

There are several things that can cause your furnace to make a loud banging or thumping sound when it turns off, but generally, the sound is caused by the sheet metal in your ductwork being bowed outward while the system is in operation and then contracting once air is no longer being forced through.

This usually happens because your air filters are dirty or your registers (vents) are closed. When your air filters are dirty or your registers closed, air cannot flow through your ducts as quickly as it should, causing it to back up. This excess air causes the thin metal in your ductwork to bow outward and make a banging sound when it returns to normal.

While this issue is not serious, it does signify that you are either not utilizing your heating system as well as you could be due to closed vents or that you need new air filters.

If you have recently replaced your furnace filters and your registers are open, but you are still experiencing a loud noise when your furnace turns off, you may have a more serious problem that needs to be investigated by a heating repair technician.

Furnace Repair in Scranton, PA & Wilkes-Barre, PA

If you are in the Scranton, PA or Wilkes-Barre, PA area and are having problems with your furnace making a loud noise when it turns off, contact the furnace repair experts at T.E. Spall & Son today.

Contact us today to schedule furnace repair in Scranton, PA with the leading heating and cooling company in the northeastern Pennsylvania area.

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