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Why Is My HVAC So Loud: 6 Potentially Unusual Noises

Have you noticed clicking, rattling, or other strange sounds coming from your HVAC? If so, that may be a cause of concern. But do not panic, because the sound may be harmless.

If you are asking "why is my HVAC so loud," then you will need to diagnose your system to find the cause.

Throughout this guide, you will learn about the different types of HVAC sounds, what they are telling you, and whether they signify a larger problem. Also, you will better understand what you can do about these sounds.

6 Types of HVAC Sounds You May Hear and What They Mean

Before understanding what steps you will need to take to remedy your noisy air ducts, you will need to understand what each sound means. Moreover, you will want to understand whether they are telling you there is a problem with your HVAC. That is what this section will cover.

1. Squealing

If you hear this type of noise, there is an issue that you must address. In this scenario, your HVAC system is usually trying to tell you that your outdoor fan- and indoor blower motors are degrading. These motors usually last 10 years, but can otherwise fall apart depending on the circumstances.

Or, squeals that come from your vents may say that you have a malfunctioning blower wheel. Either way, you will want to contact an HVAC professional and have them inspect, repair, and potentially replace your damaged internal units.

2. Rattling

Outdoor debris, such as leaves or twigs, may have lodged themselves into your system, thus resulting in a rattling noise. That is the first place you will want to check. However, if that is not the issue, your system may have a problem.

This type of noise may also signify loosening parts inside of your unit’s compressor. Or, it could mean your HVAC system has electrical contractor issues. In either scenario, you will first want to inspect all your unit's screws and bolts and tighten them if necessary.

While you are tinkering with your HVAC system, consider cleaning your condenser coils and changing your air filter. Cleaning or replacing your air filters every couple of months may help ease or eliminate noises that come from your ducts.

3. Popping

When you turn on or off your HVAC system, you may hear a popping sound come from the system. Fortunately, that is just telling you that your ductwork is expanding. Therefore, there is no cause for concern.

4. Buzzing

If you hear a buzzing sound coming from your HVAC setup, you will want to contact a local HVAC specialist to inspect your system. While buzzing could signify that there may be loose screws rattling around in your unit, it can also mean that your motor is reaching its end.

5. Clanking

Like with buzzing sounds, clanking that emits from your unit can be a sign of a loose or imbalanced part hitting other units within your HVAC setup. Or, an internal component may have broken off of your unit’s compressor.

In this scenario, you will want to fix this issue as soon as possible. Rattling parts inside your system can lead to further damage the longer you allow it to rattle against other internal components.

6. Humming

Humming is not always a sign of an underlying issue with your HVAC system. However, it may be a sign of loose refrigerant piping, which could result in vibrations that will cause a humming noise.

You will want to look further into this sign and diagnose whether the sound is harmless, especially if you run a modern HVAC system. Because manufacturers designed contemporary units to run silently.

Why is My HVAC So Loud? Here's What You Can Do About It

When asking yourself "why is my HVAC so loud," you have plenty of factors to consider.

If you are running an older HVAC system and have the funds, you may want to consider upgrading to its energy-efficient counterpart. Otherwise, depending on the diagnosis of your unit, you may have to repair or replace it.

If there is not anything wrong with your HVAC, you may not want to hire a professional and simply want to reduce the noise coming from your unit. In that case, follow some of the troubleshooting steps that we mentioned above. Tighten loose nuts and screws if that is the issue.

Otherwise, search for any debris that is sitting within your vents or clogging various motorized parts of your setup.

Once you have fixed your sound, you will want to perform regular maintenance on your HVAC system. Doing so will significantly reduce the likelihood of these sounds occurring for a while

If your HVAC system has been making unusual noise for a while, you likely need a repair or replacement. Request an appointment with Broussard Services in Biloxi, Mississippi, and Nashville, Tennessee to fix your HVAC system now.

Broussard Services

Mississippi Location
14405 Cullen St
Biloxi, MS 39532

Tennessee  Location
117 Lemuel Rd.
Nashville, TN 37207
Ph: 615-988-6030


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