How to Quiet a Noisy Furnace Blower [Rattling & Rumbling Noise]

How to Quiet a Noisy Furnace Blower [Rattling & Rumbling Noise]

During winter most people look for ways to keep their homes warm and cozy. While some have inbuilt fireplaces, others have to depend on space heaters or a furnace to achieve the same purpose.

Though a furnace can distribute heat throughout the home, it comes with a high level of noise. That is why people who use furnaces prefer storing them in basements.

You can boost comfort in your home during the cold season by looking for ways to reduce noise from a loud furnace blower.

Furnace blowers produce buzzing, rumbling & banging and whistling sounds due to different reasons. Identifying the reason behind it can help you find a quick solution to the problem.

Though you can fix some of the issues on your own, others need professional fixing. If the problem is severe, you may have to replace an old furnace with a new one.

The following techniques can help you with furnace blower noise reduction.

1. Add Return Air ducts

Sometimes the furnace blower can produce a whistle tone from a distance. If you open the air filter door and notice the noise reducing, this indicates that the blower has insufficient return air.

It may be generating a vacuum on the intake part instead of pushing the air through the system accordingly. A high-pressure difference between the intake and output side is what leads to the noise.

If you are sure that this is the problem, you can reduce the noise level by including additional return air ducts. You may need a professional who can help you replace the air ducts. A permeable filter can also boost the air flow in the furnace.

2. Consider building sound insulation

If you are wondering how to quiet a noisy furnace blower, you should try adding sound insulation to the system. You can install a melamine foam next to the blower intake. Try securing the foam using steel wire so that the furnace blower does not suck it in.

3. Replace loose parts

Loose fins on the furnace blower can also cause an annoying noise as the blower runs. If you notice a rattling noise, you should confirm if the fins are loose.

Consider replacing them if you don't have the money for a new blower fan. The quickest solution to this, however, would be replacing the system since changing loose fins.

You can also use some duct tape on any other loose part. Sometimes, a squeaking noise can be as a result of a loose belt inside the furnace blower. If the belt is loose, it needs replacement.

If you have been using the furnace for a while, it may be time to purchase a new belt to avoid such noises. This is my favorite (click here to view it on Amazon).

4. Fasten the motor using bolts

If you are still experiencing the same noise problem, you should look at the condition of the blower motor. Fasten it to the furnace using bolts and install rubber mounts which can help in noise reduction.

The current rubber mount may be missing or worn out. Confirm that no fastener is broken. A faulty fastener can make the furnace blower loud.

In such instances, an HVAC professional can help solve the problem. If the motor bearing is down, you can lubricate it using some type of oil. Placing a furnace in a room that has the floor made of concrete can cause vibrating sounds, which can be quite loud.

You can reduce this noise by placing some rubber pads below the furnace to prevent this. You should also look at the blower to confirm that there is no foreign object inside it since it can also be the cause of the noise.

Conclusion

A furnace blower can make different kinds of noises depending on what causes the malfunction. Understanding what type of furnace you have and identifying the problem can help you reduce noise from a loud furnace.

The problem could be the lack of proper circulation of air, loose parts or faulty duct work. Though these issues are common in old furnace blowers, they can also occur in new ones.

Inspect your furnace blower and determine the severity of the problem. Some of the issues can easily be fixed while others need more attention.

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