Is My Furnace Haunted? (4 Sounds Your System Makes and What They Mean)

furnace noises

Furnaces make a wide range of noises while operating, but it’s important to pay attention to the different sounds!

These noises don’t always mean that something is wrong, but they can often signal that your system is due for repairs. And in more severe cases, they can alert you to faults that could lead to fatal accidents in the future.

Here are four sounds your furnace might be making, and what they mean.


If you hear popping noises when your furnace is turned on, then it may simply be your ductwork adjusting to temperature changes.

Ducts are often made of materials such as galvanized steel or metals. And these tend to expand as the temperature gets higher, and contract as it gets lower, which of course it will be doing as fall turns into winter here in Central New Jersey! Usually, this sound is nothing to worry about and can be ignored.

Scratching and crawling

Scratching and crawling sounds may be a sign that rodents and squirrels have found their way into your ductwork. And if that’s the case, they may start living and breeding up there which could trigger a whole other set of problems.

Getting rid of unwanted critters in your system may be a bit tricky as you’ll need to bait them out of the ducts and then catch them with a trap. And afterward, you should look into vermin-proofing your system by sealing possible entry points and investing in mesh for the vents.


Constant clicking noises may mean that the thermostat inside your system is faulty. And while this isn’t exactly an urgent issue, you should take advantage of the fact that it’s easy to fix and call a professional as soon as you can.

Seeing as the thermostat controls how hot or cold your home can get, it’s something you should consider fixing quickly, before it turns into a bigger problem.


Loud banging noises often indicate that a larger part of your furnace has been loosened and is probably being tossed around inside. This can quickly become an issue in more than one way.

The loose part may be an important one, and if so, it’s only a matter of time before your home’s heating system starts to act up. And asides from that, a large piece of your unit getting smacked around will contribute to wear and tear on the system and even damage other parts in the process.

If you have any questions about your furnace, and the spooky noises it’s making in your Central New Jersey home, we’re always happy to come out to take a look! Give the experts at C&C a call anytime at 732-860-2660, or contact us online.

Scroll to Top