Updated at: 03-10-2022 - By: Sienna Lewis

Noisy air conditioners are a common gripe among homeowners, but the good news is that you can (and should) be comfortable without them.

One of the greatest contemporary comforts is air conditioning. After all, we wouldn’t be able to live as comfortably without them. But while we appreciate our heating and air conditioning systems for their ability to keep us cool in the summer and warm in the winter, we also want them to be as quiet as possible.

You may be asking what you can do about the noise your HVAC system is making. If yes, then check out our fast guide to getting a quiet heating and air conditioning system.

Here, you’ll learn how to fix a noisy AC, as well as how to find quieting options.

Tip #1. New Construction

With the guidance of pros, plan your HVAC layout if you’re building a new house. Your HVAC system should be placed in a quiet area of your house to reduce noise pollution. It’s also important to ensure that your air ducts aren’t too narrow, as this might lead to noise difficulties because of the high velocity of the air. A specialist can help you establish where and how big your ducts should be.

Why Is My Air Conditioner So Loud? | KAC Express

Tip #2. Blower Motor

A brushless D/C variable speed motor in an HVAC system will be far quieter than an A/C blower motor. In most cases, the brushless D/C variable speed motor is quieter than the AC constant speed motor when they are both running at the same RPM. Brushless DC variable speed motors have a series of permanent magnets that do not need to be charged like those in the A/C blower motors. This means that the brushless D/C variable speed motor may start and speed up as it goes, which makes it quieter overall.

Tip #3. Let Energy Air Help Fix Your Noisy HVAC System

Central Florida residents can count on Energy Air to meet their HVAC needs. For a consultation and to begin enjoying tranquility in your home, contact our knowledgeable team now.

First thing to consider is where is the noise coming from.

Is it coming from the compressor or the fan? Outside or inside the house? At startup, is it obnoxious or is it always obnoxious? What about the condenser coil’s accompanying fan?

Why Is My Air Conditioner So Loud?

There should be only a small buzzing sound when the air conditioner turns on and off when it’s working properly. Even though the outside unit will be loud when running, unusual or strident noises shouldn’t come from it.

To fix an AC that is too loud, you must first determine where the noise is coming from. With the indoors in mind, let’s get started:

Indoor Components

If the ductwork or vents are making a lot of noise, there may be anything impeding the air movement. The ductwork of your heating and cooling system can become clogged with dander, dust, and even small creatures. Airflow may be restricted as a result, and you may notice that your system is noisier than normal.

Having your air conditioner serviced by an HVAC specialist is highly recommended in this situation. In this way, they will be able to establish if anything is blocking airflow and raising the noise level within the ductwork.

Outdoor Components

It is possible that your air conditioning system’s outside components are the source of the obnoxious noise.

Squealing Noise: This sound can be heard when the system is under too much pressure. If you hear this noise coming from your air conditioner, shut it down immediately and have a professional come out to inspect it.

Refrigerant leaks can generate a hissing noise, which is likely to result in a decrease in cooling efficiency. Inspection of the refrigerant should be done as soon as possible because it can be harmful to humans.

An electrical problem with the condenser fan motor, relay switch, wiring, or another component is likely to be the cause of the buzzing noise. Turn off your air conditioning and call a professional if you have an electrical problem.

Why is my Air Conditioner so Loud? | DeZiel Heating & AC

Types of HVAC Noises

When operating efficiently, your air conditioner should be relatively silent, with the exception of a minor humming sound that happens when the system turns on or shuts down. Older air conditioning units may hum or vibrate a little louder than newer models, but some noise doesn’t necessarily indicate that your HVAC system is falling apart.

Your air conditioner should be almost completely silent when it is functioning at its peak efficiency, with the exception of a buzzing sound that occurs when the system is turned on or off. It is possible that older air conditioners have a louder hum or vibration than modern models, but this does not necessarily mean that your HVAC system is failing.

However, if the A/C is running at a high volume or making weird noises, it may need to be fixed sooner rather than later. if you hear any of the following noises coming from your air conditioner:


A popping sound is one of the most prevalent sounds heard by homeowners while their air conditioners are running. There’s no need to panic; the noise is coming from the ductwork in your home, not the air conditioner. You may notice a peculiar popping sound coming from your vents when the air is propelled through your ducts over time.


You and your family may be at risk if your outdoor HVAC unit makes a harsh, whistling noise because of excessive pressure within the system, which might cause significant damage to the equipment. If your air conditioner begins making this noise, immediately turn it off and contact an HVAC repair firm.


You should never overlook the sound of a hissing noise coming from your air conditioner. In addition to causing ineffective cooling, a refrigerant leak may pose a health hazard to children and pets who play near the outside unit.


The buzzing sounds you hear from your HVAC system are often caused by electrical problems. Avoid dealing with electrical problems on your own — it’s incredibly hazardous! Make sure to get in touch with a competent electrician or an HVAC professional as soon as possible to assess the electrical damage.


Outside HVAC rattling can be caused by a blockage, such leaves or twigs, falling into the unit or making its way into the ducting, which is why you’re hearing it. Keep an eye out for the type of rattling noises you hear, such as a faint clang here and there. Loose bolts or screws can cause noisy, metal-on-metal clashing. If that’s the case, you’ll need to find out what’s wrong and fix it.

Is is the fan motor squeaking?

Split systems have two fans. On the air handler and outside condensing unit, respectively. It is necessary to remove the outside shell in order to inspect the air conditioning unit’s interior. You’ll see a fan on top. Is there any trash or other garbage around? While inspecting the unit for dings and dent, if necessary, remove the cover. When dust and other debris build up on the fan blades, it can make a lot of noise. While a result of this, the fan may vibrate and tremble as it spins (think tennis shoes in the dryer). Having a fan with blades that are bent or unbalanced can cause them to rub against the fan’s housing. It’s going to be a lot of noise. A broken blade will necessitate a new purchase. See if you can get the fan to turn by hand-spinning it. Add WD-40 if it spins freely but produces a squeaking noise when you turn it. Using a wrench, you can tighten the fan if it appears slack. Unless the bearings need to be replaced, you’ve hit the repair lottery if it won’t spin. If they make a grinding sound, they may need to be replaced.

Do you hear rattling sounds from the outside unit?

Vibrations can be heard from the air conditioning unit while you’re working. Screws loosen with time as a result of vibration. Screws that come loose make a lot of noise. During use, the unit’s mounting screws can be loosened to allow for easy removal. In any case, when the air conditioner is blowing, you’ll hear a rattling sound. Using a screwdriver, you can address all of these issues. Make an effort to tighten the screws on the inside first.

Do you hear rattling inside the house especially when the unit first comes on?

You’ll need to go into the attic to inspect the rattling AC ducts.
How to Quiet a Noisy Air Conditioner & Should You Do It Yourself?

Hissing sounds

When refrigerant leaks, it is necessary to call in a professional to fix the problem. Occasionally, it’s only a loose duct.

I will have quiet!

It may be necessary to get a new appliance if you can’t get the current one to quiet down and it’s a major problem for you. Some models have one-twentieth the noise of older ones thanks to advancements in fan-blade form and compressor technology. There’s a chance this is for you.

Schedule Routine Maintenance

By arranging routine maintenance at the beginning of each cooling season, you may avoid noise-producing damage to your HVAC system. Your HVAC specialist will be able to discover and fix any problems that may arise during your annual tune-up.

Air Conditioning Services In Orlando

The Energy Air staff is here to help if your air conditioning system is excessively noisy. We provide a wide range of heating and cooling services and can get your house back to a comfortable temperature quickly. If you have any questions or would want to set up an appointment, please don’t hesitate to get in touch with us.