Portable AC Making Noise

In this blog, I will share the different kinds of noise that a portable ac makes, the causes of the noise and their possible solutions where possible to resolve the issue of the noise and make it cool and calm. So, that you can enjoy a peaceful sleep and time.

I will be going through all the details so, lets’ get started!

Is the noise from your portable air conditioner bothering or worrying you? While some noise from a portable air conditioner is to be expected during regular operation, significant noises must be analysed and remedied as soon as possible.

If your portable air conditioner is creating a loud noise, it could be a sign of a more serious problem, such as loose parts, a broken compressor, or a refrigerant leak. The loud noise could potentially be caused by the air conditioner standing on a hard surface, a high dB rating, poor installation, or a HIGH fan setting.

You’ll learn about the seven reasons why your portable air conditioner makes a loud noise in this post. We’ll also show you how to make your air conditioner quieter, or at the very least lessen the amount of noise it makes.

  • AC Fan Might Be Set on High
  • High Decibel Rating
  • Loose Parts Inside AC
  • Bad Compressor
  • AC Placed on Hard or Uneven Surface
  • AC Installation Problem
  • Frozen AC
  • Go for A Quietest Portable AC

AC Fan Maybe Set on High

One of the many functions of portable air conditioners is a fan. The primary purpose of the fan is to circulate the cooled air from the compressor throughout the space.

The fan speed of a portable air conditioner, which may be set to HIGH, MEDIUM, or LOW, determines how quickly the cool air is circulated in the room.

There is also an AUTO fan mode on reverse cycle portable air conditioners. The temperature of the room determines the fan speed in this mode.

How to Fix AC Fan Set on High

If your portable air conditioner is making a lot of noise because of the HIGH fan setting, you may have to pick between a faster cool air distribution and a slower air distribution with less noise.

When you are not in the room, you can set the fan to HIGH and when you are in the room, adjust it to LOW.

High Decibel Rating

Room air conditioners should not exceed a sound output level of 60 decibels (dB) indoors, according to the US Department of Energy (A).

This is the same amount of noise as everyday discussions and is not harmful to your hearing. Even though it can be bothersome, noise levels up to 80dB are still safe. However, after hours of exposure, noise levels exceeding 80dB become harmful to your hearing.

This means that you should be concerned not only about your air conditioner working properly, but also about preventing hearing impairment.

Fortunately, most portable air conditioners have a normal noise level of 40 to 60 decibels. Any noise level above that will make your portable air conditioner sound too loud.

Regardless of the dB rating, if your portable air conditioner seems to be making a greater noise than it did before, you should investigate the source and take action.

How to Fix A Noisy High Decibel Rating?

“Choices have repercussions,” as much as we despise the phrase. So, if you bought a portable air conditioner with a noise level above 60dBA, it might be too late.

In this instance, starting with a low-decibel portable air conditioner is the ideal option. That could require consulting an expert on the best low-decibel air conditioners before making a purchase.

You can, however, lessen the noise by placing a carpet or soft material under the portable air conditioner to absorb the vibrations.

Make sure you don’t insulate your air conditioner by covering it with blankets, as this could cause the machine to overheat and break down.

Loose Parts Inside AC 

One of the most typical causes of a loud noise from your portable air conditioner is a loose part, especially if your machine is older.

Moving parts are present in portable air conditioners. These parts wear out, become loose, break, or even detach completely over time.

This is especially true of the caster wheels, although your portable AC’s fan blower and outside casing may also be impacted.

Parts that are loose, broken, or missing can cause the portable air conditioner to vibrate more, resulting in loud noises.

How to Fix Loose Parts Inside AC?

If your portable air conditioner has any loose or broken parts, you’ll need to have them replaced or repaired to lessen the noise it makes when it’s turned on.

The caster wheels on your portable air conditioner, for example, work on the pivot principle, and once the wheel’s centre is offset from the pivot point, it can quickly become noisy.

We recommend contacting a professional technician to inspect and fix any broken or loose parts in your portable air conditioner. Doing it yourself will almost always result in more harm to the unit.

Bad Compressor

During regular operation, a portable air conditioner will produce a slight intermittent vibration. However, loud rattling noise from your portable air conditioner could indicate a faulty compressor.

Worn-out isolation feet are one of the issues that can cause your compressor to rattle. The compressor is supported at the base by these rubber feet.

When the isolator feet crack or disintegrate, the compressor loses balance and starts making noises when your portable air conditioner is turned on.

A noisy compressor could also mean that the cooling mechanism in the compressor isn’t working properly, that the electrical voltage isn’t high enough, or that the electrical connections are incorrect.

How to Fix Bad Portable AC Compressor

Your portable air conditioner’s compressor is its beating heart. There will be no cold air blowing from the device if it is faulty.

Compressors are a fragile component of your cooling system, and you should avoid further damage at all costs. As a result, we propose that you fill out the form at the bottom of this page to be linked with a reputable air conditioning specialist.

AC Placed on Hard or Uneven Surface

When a vibrating portable air conditioner is placed on a hard or uneven surface, it will not only travel slowly but also make more noise.

Hard surfaces, such as tiles and hardwood, don’t absorb sound, but rather intensify it. As a result, softer surfaces are better for keeping a portable AC quiet.

How to Fix AC Place on Hard or Uneven Surface

To begin, make sure your portable air conditioner is sitting on level ground to minimise any noises generated by the imbalance and to keep your cooling unit from tipping over due to the vibrations’ gradual travel.

Place your portable air conditioner on a carpet or improvise a soft surface with rags, a blanket, or towels in place of a hard surface.

You may also purchase sound-absorbing floor mats to soundproof your portable AC while also protecting your floor.

Basics Foam Interlocking Exercise Gym Floor Mat Tiles

  • Easy assembly: Lightweight puzzle pieces connect quickly and effortlessly, and can be dismantled just as fast for simple storage. 
  • Protective workout flooring: Durable, non-skid textured tiles protect floors while creating a comfortable training space.
  • Versatile: The easy-to-clean, water- and noise-resistant design are ideal for garages, gyms, home exercise rooms, and children’s play areas.
Material NeededTools Required
Basics Foam Interlocking Exercise Gym Floor Mat TilesPortable Ac Tools Kit

AC Installation Problem

It’s possible that the window installation was done incorrectly if your air conditioner is creating a loud buzzing noise.

Improper installation could mean that the duct and window panels are not firmly fastened in place, resulting in a rattling sound when the air conditioner is turned on (or even when the wind blows).

How to Fix the Problem If Your AC Is Not Installed Properly?

First, double-check that the foam seals are in the right place. Check that the window panel component is properly installed in the window opening and that the window is properly closed.

Duct tape can be used to seal the joints or any gaps that may be present if you desire a tighter seal. To avoid leaving stains on your window, use the no-residue duct tape.

No Residue Duct Tape

  • The strong adhesive forms a long-lasting bind without causing a mess. 
  • Cleanly removes for up to six months after application Bundling, securing cords, and mats are all made easier with this product. 
  • Can be used for both temporary and permanent repairs
Material Needed
No Residue Duct Tape

Frozen AC

Your portable air conditioner, believe it or not, can freeze if used frequently.

This occurs when the refrigerant leaks, resulting in a buzzing sound from your portable air conditioner.

Fixing A Frozen AC

There is no way to get around this. To examine and fix your cooling system, you’ll need to contact a professional technician.

By completing the form at the bottom of the page and allowing us to link you with a skilled Technician repair service near you, you may speed up the repair process.

Go for A Quietest Portable AC

I would suggest Serene-Life SLACHT108 Portable Air Conditioner which is the quietest available in the market and may solve your problem. With multiple functions like: 

  • Handy Portable 
  • Built-in Humidifier 
  • Four Operations Mode 
Material Needed
Serene-Life SLACHT108 Portable Air Conditioner


Not all weird noises made by your air conditioner indicate that something is wrong with it! Sometimes the answer is straightforward.

For example, there may be a loose thingamabob or doohickey that you can simply fix yourself (DIY), saving you money on a repair diagnosis.

Some HVAC professional websites may provide you with free guidance. They could even be able to assist you with your problem over the phone!

When it comes to one or more of the significant issues listed above, however, make an appointment with your local specialist for an in-home inspection.

They will swiftly and properly identify the root of the problem, make a repair recommendation, and then leave the rest to you.

Frequently Asked Question (FAQs)

Why is my portable AC making noise?

If your portable air conditioner is making rattling noises, the issue is most likely with the fans (the blades are producing the vibrations that eventually lead to rattling noises). Two fans, the blower fan in the air handler and the fan in the condenser coil, are frequently misaligned. Moreover, following maybe, the cause of the noise your portable ac is making

  • AC Fan Might Be Set on High
  • High Decibel Rating
  • Loose Parts Inside AC
  • Bad Compressor
  • AC Placed on Hard or Uneven Surface
  • AC Installation Problem
  • Frozen AC

How do I stop my portable air conditioner from making noise?

Alternatively, try shifting the hose or changing the surface. Unless you hear a metallic sound, pulsating noises aren’t always a sign of something bad. This could indicate that the fan on your device has become loose. You could probably fix it yourself with a screwdriver and pliers, but it’s best to hire a pro.

Why is my portable AC making a whistling noise?

A high-pitched whistling sound usually indicates that your air conditioner isn’t getting enough airflow through the return vents and ductwork, which pull air from your home to the cooling evaporator coils. To pull enough air through the system, your air conditioner must work harder.

Why is my AC unit making a humming sound?

A buzzing sound could mean the compressor isn’t working properly or there’s an electrical issue. To have your system professionally diagnosed and repaired, contact a trustworthy HVAC contractor for skilled air conditioning repair services.

Can an air conditioner explode?

Rarely do air conditioners simply blow up. They can, however, overheat and catch fire. The pressurized gas could explode as a result of the fire.

What does an AC compressor sound like?

The AC compressor, like other accessories driven by the engine’s belts, contains multiple inner components and rotates on a sealed bearing. A worn bearing makes a high-pitched squealing or grinding noise, but a seized bearing makes a grinding noise or a notable belt squeak.