Why Is My Furnace Making Loud Noises?
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Why Is My Furnace Making Loud Noises?

While furnaces aren’t always completely silent when they’re running, they shouldn’t be making loud noises. If they are, it’s a sign that something could be wrong and it’s in need of a repair or replacement. What are some strange noises you should be on the lookout for and what do they mean?


Consistent whistling most likely means the air filter in your furnace is clogged. If it’s clogged with dirt, dust, or other debris, the airflow will be restricted, therefore leading to a whistling sound. This can be easily solved with a deep, professional air filter cleaning or replacement.


If you hear loud banging, your ductwork is most likely flexing. This occurs when there are pressure changes between the return and supply ducts, which is also known as oil-caning. If it is oil-canning, it needs to be looked at and fixed by a professional so it can function properly again.

It’s not uncommon for air ducts to occasionally make popping noises, especially if they’re on the older side. However, if it’s louder and more continuous than an occasional pop, then there’s most likely a deeper issue that needs to be addressed.


Rattling is another furnace noise you should be on the lookout for. Luckily, it’s most likely simply a loose screw that’s rattling against another surface and just needs to be tightened. If you’re not sure where the loose screw is or how to properly tighten it, a trained HVAC pro will be able to do it for you easily.

A rattling noise could also be the result of a bigger issue: a cracked heat exchanger. It cracks when there isn’t proper airflow, so the heat builds up and isn’t released. Cracks can even lead to carbon monoxide leaks, which are extremely dangerous and need to be tended to immediately. Therefore, if you hear rattling and don’t know where it’s coming from, it’s vital to contact a service professional right away.


A furnace blower is an important component of the heating system. It’s what pushes the hot air through the ducts into the home, so it needs to be oiled up to push the air out. If it’s not oiled up enough, then it will most likely give off a screeching noise, and needs to be properly lubricated by a professional to be working efficiently.

Contact Us Today for HVAC Services

If your furnace is making strange noises or is otherwise not functioning properly, don’t delay on getting heating repairs in Apex. The longer you wait, the worse the issue can get, and we don’t want you to be stuck without heating in your home. For furnace repair near Wake Forest, give us a call!

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