Why Is My Furnace So Loud?
3 minutes read

Why is my furnace so loud?

Published by Steven Weiland

You may be asking yourself, why is my furnace so loud? More than likely, your furnace making strange noises is a pretty good sign that something is wrong. It is probably a good idea to call an HVAC professional to come diagnose the problem and fix it before the problem get worse. First, it’s a good idea to know the types of noises your furnace might be making and what each of them could potentially mean.


Banging noises coming from your furnace could be indicative of a few different problems. One of the issues that could be going on is dirty burners. When the burners in your furnace are dirty, it may take longer for them to light, which allows more gas to build up. When the burners finally do light, there is more gas in the chamber which causes a larger ignition. This could be the banging noise that you’re hearing. This is definitely not good. Call an heating specialist to take care of this right away, as you do not want it to get worse, because the ignitions will only get larger and louder, putting your furnace and home at risk of damage.

The other option is that there may be changes in pressure in your air ducts. This causes them to expand, which may be the root of the sound. It may sound thunderous and booming, but it is not an immediate threat. It could be the result of undersized ducts or closed vents, or even a clogged filter.


If you are hearing screeching noises or frequent chirping, you may have something wrong with your blower wheel. It could also be an issue with the motor. Either way, they could be broken causing them to scrape up against the casing of the furnace. You’ll want to get this fixed as soon as possible, if only to stop the annoying noise!


Whistling and whooshing noises more often than not come from the ductwork. If there are gaps in the ducts, or the ducts are too small, it could cause this whistle. Air blowing through small spaces is what causes a whistle, so it’s likely that the problem is with something that air is being blown through (like the ducts). It could also be the work of a dry filter.


Rattling noises may come from nuts or bolts that are loose, or other parts of the furnace or ducts that may be loose. This is usually an easy fix.

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