12 Ways on How to Quiet a Noisy Furnace Blower


During the colder months, your furnace is your constantly-running lifeline. However, it can be extremely annoying if it starts constantly making noise while running. One of the primary moving parts on a furnace, and therefore one of the things that tends to be the culprit of furnace noise, is the blower.

The furnace blower is the part of the furnace that blows hot air into your ductwork so that it can make its way throughout your home. The blower is made up of a blower motor and a blower fan, and issues with one or both of these components could be making your furnace much noisier than it has to be.

If that’s the case, use these tricks on how to quiet a noisy furnace blower so you can be warm in peace:

1. Call in the furnace repair service

All said and done, it may actually be a larger issue that is causing the noisy ducts. If you’ve already done all you’re able or willing to do, and your furnace blower is still too noisy for your liking, you should call in a professional furnace repair service to fix the issue. They will be able to more easily identify and then remedy your furnace’s noise issues.

2. Know there might be different causes

Although most furnace noises are a direct result of issues with the blower fan or blower motor, it is important that you keep an open mind. Because sounds can resonate throughout the ductwork, it can be difficult to decipher where a particular sound is coming from.

Keep your eyes – and ears – open. Know that there are different causes of a noisy furnace motor.

3. Adjust the furnace fan speed

Upon installation, your furnace’s fan should have been set to the appropriate speed for your unit, house size, and duct size.

However, this isn’t always the case, and a setting that is too high for your space can cause whooshing air sounds to come from your vents. To decrease this sound, try lowering the fan speed a notch.

4. Clean the blower fan

A loud humming sound could be the result of too much dust buildup on the blower fan. Think of it this way: that caked-on dust is essentially creating wind resistance, which makes the loud humming sound. Clean it off to bring it back to its former glory!

5. Replace the blower fan bearings

Over time, blower fan bearings can wear out. When this occurs, they can create noises that are amplified by the ductwork. A simple fix is to replace these bearings, which should eliminate the noise altogether.

6. Replace the blower fan blade

You may also run up against a damaged blower fan. It is rare, but it can happen that the fan blades become bent. If that’s the case, confirm the size of your blower fan, and buy a new one.

7. Oil the blower motor

A squealing or screeching sound may be caused by an unoiled blower motor. Add some 3-in-1 motor oil, which should quiet it down.

8. Check the belts

There are belts connected to the blower that can become worn out, frayed, loose, or misaligned. Any of these issues could be the source of your noise. Check the belts, and replace or tighten as necessary.

9. Motor mounts

Since the motor is a constantly-running, shaking, moving piece, the motor mounts may become loose over time, or if they weren’t tightened correctly.

The motor’s jiggling and shaking against other metal pieces can cause banging noises that might sound way worse than they actually are. Check that the motor mount is well tightened before searching for more serious issues.

10. Replace the motor

Sadly, banging sounds could be indicative of something much more serious: a busted motor. If your blower motor is going, there’s not much you can do but replace it.

11. Connect it better

Frequently, a furnace will start to make whistling noises as a result of a tiny gap between the blower and the ductwork. It’s an easy enough fix though – the reason the whistling has started is likely because the air filter is clogged.

To confirm, remove the air filter. If the whistling stops, then you know that all you need to do is replace it. Make sure not to leave it too long – leaving a clogged air filter will cause your blower fan to wear more quickly.

12. Insulate

Motors and machines make noise, that’s just the way it is. One way to decrease the sound is to insulate. Interestingly enough, the “magic eraser” cleaning products you can buy are actually made from a heat-resistant, insulating material called melamine foam.

Cut a sheet of thin, galvanized steel to the size of the space inside the furnace just next to the blower intake. Cover the sheet with magic erasers by gluing them on, and cover the erasers with chicken wire to protect them from being sucked into the blower. Instant insulation.


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