Quietest Window Air Conditioners 2021: Best Quiet Window AC

quietest air conditioner

Having a window air conditioner is more a need than a luxury, especially in hot and humid climates. But one of the problems with window air conditioners is that they are noisy.

Finding a Quiet Window AC with good performance can be a daunting task. This is so because Windows AC manufacturers do not usually list the noise level rating of their device. Do not worry, I’ll help you get acquainted with some of the best quiet window ACs available in the market. And also, I’ll provide a guide to help you choose a great quiet window AC specifically for you. So read on!

In a hurry? The quietest window air conditioners in 2021 are the Midea U Inverter Window Air Conditioner and Haier Serenity Series. Or if you’re looking for a cheaper alternative, go for HomeLabs 5000 BTU Window-Mounted AC.

Quiet Windows air conditioners

On a hot summer day, everything seems too hot to handle. And after making your way through the heat radiating roads you enter your house half baked.

After closing the door, the first thing you do is switch the AC on and let the cool air fill the room with bliss.

But once you get comfortable in that bliss, you start to get annoyed again. Not because of the temperature but because of noise. Many people complain of having to switch the AC off to listen to someone.

Who wants to wake up in the middle of the night just because the AC has started to give out some burps? Sometimes even the lowest fan setting in the AC is noisy enough to ruin sleep.

But the following three air conditioners are engineered so well that they provide you with the cool you need and have a quiet presence in your room. No air conditioner operates at zero sound as of now. But below are some of the quietest window ACs which have good cooling performance too.

If you need a silent wall aircon as well then check out the quietest wall air conditioners 2021. We also have an article about quietest 10000 BTU air conditioners in 2021 

Reviews of the Quietest Air Conditioners 2021

Haier Serenity Series 6,000 Btu 115V Window Air Conditioner with Ultra Quiet Sound Package

Quietest Air Conditioner

When it comes to providing ample cooling while keeping noises to the bare minimum, it is difficult to find a better AC unit that this one.

It is most suitable for a 250-300 Sq.Ft. Room and it packs all the needed automation features along with a remote control.

If having an ultra quiet AC is your primary concern, these units are for you.


  • Ultra Quiet
  • Automated Features



  • Not The Fastest Cooling

Click here to see the current price

HomeLabs 5000 BTU Window-Mounted Air Conditioner 

Cheapest Quiet Window AC

This is one of the best options for you if you have a tight space and a tighter pocket. 

The unit is very basic and has only knob controls for fan speed and cooling intensity. You also don’t get a timer or a temperature setting. 

But what you do get is quick and powerful cooling even during peak summer. 

It is suitable for rooms up to 150 Sq.ft. and fits into windows larger than 23″W x 13″H. 

The installation is hassle-free and HomeLabs is known for good customer support in case you face any troubles. 

Although it’s not as quiet as the Haier Serenity air con, the noise level is low enough to get a peaceful sleep without any disturbance. 


  • Power cooling
  • Simple controls
  • Easy installation


  • No remote

Click here to see the current price

SPT 12000 BTU Window Air Conditioner WA-1211S

This is one of the most value for money AC units available in the market. It delivers excellent cooling performance and has tons of features.

It operates surprisingly quiet for its capacity  and is suitable for air conditioning a 600-800 Sq.ft room.

You can choose from a number of interesting operating modes.

Like the Dry mode that makes the AC work as a dehumidifier and the Energy Saver Mode which controls the temperature and fan setting in such a way that it uses minimum power.

With a remote control with intuitive controls, it is also pretty easy to use its plethora of features.

It barely has any disadvantages to it except that it is a bit on the heavier side which may make installation a little challenging.


  • Powerful cooling
  • Quiet operation
  • Feature rich



  • Installation is a bit tedious


Click here to see the current price


Frigidaire FFRA0511R1 5, 000 BTU 115V Window-Mounted Mini-Compact AC with Mechanical Controls

If you are on a tight budget and your room size is within 300 Sq Ft, this Frigidaire compact Air Conditioner is the right one for you.

This unit keeps the noise low and performs like magic.

It cools the room so quickly that you may complain of feeling too cold too soon but never otherwise.

This is ideal for small sized guest rooms in which you don’t want to invest much but provide a comfortable stay at the same time.

The only downside is that the unit has neither automated features nor a remote control.

But based on many user experiences, this unit is solidly built and is very reliable for the long run.


  • Cooling Performance
  • Low Noise
  • Very Reliable


  • Absence of automated features

Click here to see the current price

Although the above mentioned units are rated as best based on their performance, there is still a variety of AC units that may be suitable specifically to your cooling requirement.

This calls for a guide to help you finalize what kind of AC unit you actually need and then to identify the best option.

So let’s get to it.

Buyer’s Guide to Quiet Windows AC Units

The main factors that I consider when planning for a purchase are,

  • Cooling Capacity
  • Noise Level
  • Automation
  • Reliability
  • Ease of use

Read also: ultra quiet portable air conditioner and best quiet ductless split system AC 2021

Cooling Capacity

The capacity of the Windows AC unit is basically a measure of how easily does it cool a room.

But mind you, a higher capacity unit is not always the better option.

British Thermal Units (BTU) is the measure used to rate the capacity of Windows Air Conditioners. For home use, the capacity usually ranges from 5000 BTU to 12000 BTU.

You need to choose the capacity (BTU) of your AC based primarily on the size of your room.

  • If the BTU is higher than required, the room will be cooled unevenly and you won’t find it comfortable.
  • If the BTU is lower than required, the AC unit will struggle so much to achieve and maintain the temperature that it will make a lot of noise and also get damaged.

The table below can help you choose the correct capacity (BTU) for you room size.

Room SIze (Sq. Ft)


















Apart from room size there are also other factors that may require from you a little bit more cooling capacity.

The secondary factors affecting AC unit capacity (BTU) are:

  • Lack of shading from sunlight
  • Number of people and active appliances like refrigerator, dishwasher, hairdryer etc. that act as heat sources.
  • Frequent opening and closing of the door


In order to compensate for the above factors, add a 10% to the BTU for each factor and 600 BTU for each active heating source.

You can now fix the required capacity of your Window Air Conditioning Unit and thereby narrow down your choices.

Noise Level

This being the main reason that you are reading this article, you know how even a good cooling AC unit can ruin your ambience by being noisy.

There are some manufacturers who include the actual noise level of the AC unit in their description.

This is given in Decibels (dBA) and it is usually the amount of noise that the AC produces at its lowest fan setting.

To get an idea of how much decibels is how much noise, check out the table below.





Threshold of human hearing




Quiet Room


Whisper, Light Snoring


Moderate Snoring




Busy Street, Alarm Clock


Hairdryer, Noise Restaurant


Loud Radio


Bass Drum


Subway Train


Industrial Noise


Jet Plane Take off


Gun shot, Rock Concert

Keep in mind that measuring sound level in Decibels is not the same as measuring length or weight.

The Decibel scale is a logarithmic scale. In simple terms, 60dBA is not twice as loud as 30dBA. And 70dBA can be ten times as loud as 60dBA.

So, when one AC units lists 50dBA as its lowest noise level and another AC has 55dBA, don’t think that the second one is just slightly louder than the first one.

It could be way louder than you think.

So it’s better to go for the lowest dBA rated AC available in your shortlisted choices.

Factors such as these can also cause your noise level to increase soon after installing the AC unit:

  • Improper Mounting
  • Faulty parts
  • Dusty environment
  • Over loading due to Lower capacity(BTU)

There are two things to consider when we talk about improper mounting.

One, the AC unit should be mounted in such a way that there is no rattling noise during use.

Two, The mounting should be done in such a way that no gaps are there through which outside noise can enter your room.

This is very critical because, not only noise, but hot air can also enter your room from outside and cause the AC unit to work harder.

Also, keep your room clean and free of dust since, the health of your AC unit is severely affected when dust starts to accumulate over its inner parts.

And as discussed earlier, one of most underestimated cause of noise is having an AC which has a lower capacity than needed for your room.


By Automation, I mean the features present in most modern AC units like Auto ON/ OFF Timer, Power Saver Mode, Auto Fan Speed Control etc.

You may wonder what does this have anything to do with choosing a “Quiet” Window AC unit. I’ll tell you why.

We all know that an AC (during operation) is most silent when it is running in the lowest fan setting.

So for example, if you have an Auto ON/ OFF Timer and Auto Fan Control, you can set the unit to start cooling the room for sometime before reach home.

Therefore, when you enter the room, the AC has already finished all the hard work and is now just running at the lowest setting possible to maintain the temperature.

You can also set the AC to switch over to a particular temperature or just switch off at a particular time.

Features like these can not only be useful in reducing the noise you experience but can also lower its running costs.

Some manufacturers have special operation modes named like “Power Saver Mode”, “Silent Mode”, “Eco-Mode” etc. 


A window AC is a mechanical device with a lot of moving parts and heat exchanging parts.

Therefore it is important that the material used to make these parts are of good quality and are designed well to ensure that the AC runs long without any issues.

But if the parts of the AC are poorly made, although the AC may be quiet and perform well at first, soon after you’ll hear the AC making all sorts of noise while struggling to cool the room.

Investing in an AC only on the basis of numbers in the product description is not a good idea.

If the product is very new, I suggest that you don’t take the risk if the AC is sold by an unknown or relatively new manufacturer.

Instead go for an AC manufacturer whose products are known to be reliable and also  has a commendable after-sales service.

Ease of Use

This is also something that is not directly related to the AC’s noise level.

One of the primary reason that people look for a quiet Air Conditioner is to have peaceful sleep in the night.

When that is the case, you don’t want to wake up in the middle of the night and have to put the lights on, walk to the AC and try to adjust the setting with some confusing knobs or worse-buttons.

The back-lit remote control may solve such a problem.

It is to be noted that if you have a good featured air conditioner you may not need to wake up in the middle if the night at all.

Even little things like the adjustment of vent direction or setting a timer can be really annoying if the AC interface is not user friendly.

So the bottom line is, in order to have a really undisturbed sleep or usage, you need to be able to use the AC unit with ease.


Other things to consider

So these are five important factors that you need to consider when planning to buy a Silent Windows Air Conditioner.

Apart from these, aesthetic factors such as, color options texture and design can be left to your own taste.

What is Energy Efficient Ratio?

The Energy Efficiency Ratio is a rating given to indicate.

Also, Energy Efficiency ratio is mandated by the US Government to be displayed in the description on all Windows ACs.

A good Window AC can have an Energy Efficiency ratio ranging from 10 to 12.

Is White Noise produced from ACs good for sleep?

Yes and No. White noise is known to provide a soothing atmosphere for sleeping but not all people experience the same effect. Some may still find it annoying.

Besides, white noise needs to be heard at a low noise level to be of use in sleeping.

And certainly you wont get a proper low volume white noise from a Window AC.

Is a Voltage Stabilizer required for using the AC?

Yes, in most cases, you will need a voltage stabilizer to protect your AC from getting harmed due to fluctuations.

There are some AC models which have voltage stabilization built in, in which case you won’t need to get a separate one.


To conclude, having a quiet windows AC depends half on the manufacturer and half on us who choose and install it.

Following the above guide will help you be wise in choosing the right one for you.

If you want the quietest window air conditioner in 2021, go for the best rated Midea U Inverter Window Air Conditioner or Haier Serenity Series AC Unit. However, if you’re looking for a cheaper alternative, get the HomeLabs 5000 BTU Window-Mounted AC.

Happy Chilling!