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Speedy Air Conditioning Service Blog

Weird Furnace Noises and What They Indicate

Furnaces make all kinds of noises during operation, and if you’ve had your furnace for any length of time you know what those noises usually sound like. If your furnace starts making unusual noises during operation, though, you should never ignore them. Weird noises are a prime indicator of problems in the system. If you just let them continue, you could be allowing a serious problem to get worse. Let’s take a look at different unusual furnace noises, and what they mean.


Your furnace uses an air handler to circulate air throughout the house while it’s operating. The air handler motor is placed under a lot of stress while it’s running, and is equipped with lubricated bearings to help alleviate the friction. These bearings wear down over time, however, causing the friction on the motor to increase and producing a grinding sound. If the bearings aren’t repaired in time, the motor will burn out and need to be replaced.


If your furnace sounds like a cannon when it first fires up, it’s probably because the burner assembly hasn’t been cleaned in a while. As the burners combust natural gas, carbon particles settle on the assembly. Eventually, the buildup becomes so bad that one or more of the jets in the assembly start firing later than they are supposed to. When they finally do ignite, they burn through all of the excess gas at once and generate a loud booming sound. If you hear this sound coming from your furnace, you should have a professional look at the burner assembly. If the assembly continues to go without being cleaned, it can eventually become so dirty that it won’t ignite at all.

If you need furnace repairs of any kind, call Speedy Air Conditioning Service. We offer furnace repair services throughout Port St. Lucie, FL.

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