• residential Service

      commercial service

Why is My AC Running Loud?

air conditioner making loud buzzing noise

Is your air conditioner driving you crazy? It’s essential on a hot day, but your AC running loud is an annoying inconvenience. So what is going on exactly?

Loud noises coming from your home air conditioner are not normal. A certain amount of noise is to be expected, but if you notice your AC unit making more noise than usual, it’s time to do some troubleshooting.

AC Running Loud: Top 5 Reasons Why

Though there are many causes for the loud noises you’re hearing, it’s most likely due to one of the following reasons:

#1 – Loose Parts

With so many moving components, vibrations can lead to loose parts over time. It could be as simple as a few loose screws, but if certain parts aren’t connected correctly, your air conditioner won’t run as efficiently.

If you’re handy, you can check for loose parts yourself. However, AC units are complicated machines. It may be difficult to identify the source of the noise, so it’s best to have an expert take a look.

#2 – Frozen AC Unit

Yes, it’s possible for your AC unit to be too cold. There are a few ways your air conditioner can freeze up, one being that you’ve had it running too long. Frozen parts can’t move correctly and cause that loud buzzing noise you’re hearing.

Turn off the unit and allow it to defrost before turning it back on. However, if this is a recurring issue, there may be a leak in the compressor. In this case, you’ll need to have your AC unit serviced and repaired.

ac running loud

#3 – Faulty AC Condenser Fan Motor

One reason you hear your air conditioner making loud buzzing noises is due to the condenser fan motor. This is the main fan in the outside unit that blows cool air on the unit’s condenser coils.

Turn on the unit and check if the outside fan is turning. If the indoor blower is on but the fan isn’t turning, then the condenser fan motor is the source of the loud noise and needs to be replaced.

#4 – Malfunctioning Compressor

The compressor is extremely important to the cooling function of your air conditioner. It moves refrigerant through the system to help create cold air. An AC compressor running loud could indicate a big problem.

There are many reasons why a compressor isn’t working right. Sometimes it’s as simple as a power issue. Unfortunately, it’s usually due to part failure. A professional needs to diagnose the cause and repair or replace it.

#5 – Defective Contactor Relay Switch

Sometimes the cause of your AC running loud is as simple as a broken contactor relay switch. This part is controlled by the thermostat to turn the high voltage on or off to the compressor.

Since it’s controlled electronically, a malfunction causes an electrical buzzing noise. Luckily, if the contactor relay switch is the culprit, it’s a relatively inexpensive part to replace.

If you can’t handle your AC running loud any longer, give Dependable Heating & Air a call to schedule your air conditioner repair appointment.

Troubleshoot Error Codes

carrier furnace error codes
Heating

What Do Carrier Furnace Yellow Light Codes Mean? Your Ultimate Guide to Error Codes

When the light on your Carrier furnace is yellow and flashing, it’s like your furnace ...
Goodman Air Conditioner Codes
Air Conditioner

Goodman Air Conditioner Codes: Troubleshooting Common Goodman AC Failures

Your Goodman AC may flash codes if it detects a failure. Understanding the Goodman Air ...
Maintenance

How to fix the American Standard HVAC 3 Flash Error Code

Wondering how to troubleshoot the American Standard HVAC 3 Flash Error Code? We cover the 3, 2, & 22 flash error codes.
Save On HVAC Maintenance​
Ready to save on annual maintenance & utility bills? Enroll in our Annual HVAC Maintenance Plan today!
SAVE $40

Hot (& Cold) Topics

smart thermostat pros and cons
Air Conditioner

Smart Thermostat Pros and Cons: Navigating the Modern Home Climate Control

As we embrace the era of smart home technology, the debate around the smart thermostat ...
house not heating evenly
Heating

Is Your House Not Heating Evenly? Try These Tips for Heat in Every Room

Is it feeling like the Arctic in your bedroom, but a tropical paradise in the ...
air conditioner smells
Air Conditioner

6 Reasons Why Your Air Conditioner Smells and How to Stop the Odor

Facing odd smells when you turn on your AC? Discover the causes and learn preventative tips to keep your home smelling fresh all summer long! ...
how to improve home air quality
Air Conditioner

How to Improve Home Air Quality and Breathe Easy

Is your home feeling stuffy or triggering allergies? Dive into these preventative tips to ensure you're breathing the cleanest air possible. A healthier, fresher home ...
How to Prevent Mold in HVAC Systems
Air Conditioner

The Ultimate Guide on How to Prevent Mold in HVAC Systems

Today, we’re diving into a topic that may seem small but can be very important ...

Stay in the know

Get repair tips, maintenance advice, and other useful content when you subscribe to our newsletter.

Local Area Info

atlanta water attractions free
Local

Best Places to Cool Off in Atlanta: Atlanta Water Attractions

It’s called “Hotlanta” for a reason. Whether you live here or you’re planning on visiting, ...
air purifier prevent covid-19
Air Conditioner

Can an Air Purifier Prevent Coronavirus?

When waging the war against coronavirus, having multiple tactics in our arsenal seems to be ...
can i get BBQ delivered
Local

5 Best BBQ Delivery Atlanta Restaurants

For a true BBQ fan, few cities offer more authentic options than Atlanta. But while ...