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If you’ve ever wondered why your furnace is so loud, you’re not alone. Furnaces can be quite noisy, and it’s often one of the first things homeowners notice when they move into a new home. 

There are a few different reasons why furnaces can be loud, and understanding the cause of the noise can help you determine whether or not it’s something you need to be concerned about.

In this blog, we’ll discuss six potential causes of a loud furnace and what you can do to fix them.

1. The Unit Is Old

Over time, parts can begin to wear out and make noise as they operate. If your furnace is getting up there in age, it does not necessarily cause alarm, but it’s something to keep in mind. If the noise is accompanied by other problems, such as a decline in performance, then it’s time to start thinking about replacing the furnace.

2. Dirty or Clogged Air Filters 

When air filters become clogged with dirt and dust, they restrict air flow. This can cause the furnace to work harder to circulate air, which can make it noisy. To fix this, simply replace your air filters with clean ones. Depending on the type of furnace you have, you may need to do this every few months

3. Loose Parts 

Over time, parts can become loose and vibrate when the furnace is running. This can create a rattling noise. To fix this, you’ll need to inspect your furnace and tighten any loose parts. This is something you may be able to do yourself, but you may need to call a professional if you’re not comfortable working with your furnace. 

4. Worn-Out Parts 

As furnaces age, parts can wear out and break. This can cause all sorts of problems, including a loud furnace. If you think your furnace is loud because of worn-out parts, it’s best to call a professional. They can inspect your furnace and replace any worn-out parts. 

5. Faulty Blower Motor

The blower motor is responsible for circulating air through the furnace and into your home. If the motor is going bad, it can make a lot of noise. If you think this might be the problem, it’s best to call a professional to take a look.

6. Some Furnaces Are Simply Louder than Others

Some models are designed to be more efficient, and this often comes at the expense of noise. If you’re concerned about the noise level of your furnace, it’s a good idea to talk to your heating and cooling contractor about your options. They can help you choose a model that will be more efficient and less noisy.


If you’re noticing that your furnace is making more noise than usual, it’s important to take action. By understanding the cause of the noise, you can determine whether or not it’s something that you need to be concerned about. 

If the noise is due to a dirty furnace, you can have it cleaned by a professional. If the noise is due to an old furnace, you may need to start thinking about replacing the unit. And if the noise is simply due to the model of furnace you have, you can talk to your contractor about choosing a quieter model.

When it comes to furnace maintenance in Oshawa, no one does it better than Fortis Heating & Air Conditioning. We can convert your existing HVAC system to a more efficient one so that you and everyone in your home can remain cozy. Contact us now to get a quote!

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