10 Quietest Window AC Units in 2021 (Quieter Than a Library)

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Since a window AC is in the room it is cooling, you want the quietest window air conditioner you can find. It will make sleeping, carrying on a conversation or listening to media much easier.

The tables below include 10 quiet window air conditioners.

The 10 quietest window air conditioners are:

      Image                    Product

haier quiet window ac

Haier Serenity ESAQ406T

  • 6,000 BTU, 250 square feet
  • 18.1 X 21.2 X 12.4 Inches
  • 55.6 pounds
  • Noise Level: 44 dB
lg quiet ac with heat

LG 115V With Heat Function

  • 7,500 BTU, 320 square feet
  • 18.4 x 20.9 x 13.9 inches
  • 69 pounds
  • Noise Level: 50 dB
Friedrich Chill Premier

Friedrich Chill Premier 8,000 BTU

  • 8,000 BTU, Up to 350 square feet
  • 61lbs
  • 23.75 x 19.75 x 14.63 inches
  • Noise Level: 47 dB on low

Frigidaire FFRE1033S1

  • 10,000 BTU, 400-450 square feet
  • 19 x 21.5 x 14.5 inches
  • 50.3 pounds
  • Noise Level: 52 dB on low
Midea U Inverter Window Air Conditioner

Midea U Inverter Window Air Conditioner

  • 8,000 BTU, 250-350 square feet
  • 21.97 x 19.17 x 13.46 inches
  • 67lbs
  • Noise Level: 42 dB


  • 12,000 BTU, 450-550 square feet
  • 23.6 x 22.2 x 15 inches
  • 81 pounds
  • Noise Level: 53 dB
Koldfront WAC18001W

Koldfront WAC18001W 18,500

  • 18,500 BTU, 800-1,000 square feet
  • 25.38 x 23.63 x 17.88 inches
  • 117lbs
  • Noise Level: 54 dB
Frigidaire FFRE1833U2

Frigidaire FFRE1833U2 18,000 BTU

  • 700-1,000 square feet
  • 27.4 x 23.6 x 17.7 inches
  • 129lbs
  • Noise Level: 59 dB


  • 22,000 BTU, 1,100-1,300 sq. ft.
  • 26.2 x 25.9 x 17.7 inches
  • 110.5 pounds
  • Noise Level: 52 dB

Frigidaire FFRH2522R2

  • 25,000 BTU, 1,100-1,300 sq. ft.
  • 26.5 x 26.5 x 18.6 inches
  • 136 pounds
  • Noise Level: 52 dB - 63.2 dB

Now, let’s take a look at the details of each quiet window AC, so you can choose the best fit for your cooling requirements.

Quiet Window Air Conditioner Reviews

The first part shows window units from 5,000 to 10,000 BTUs.

The second part includes quiet window air conditioners from 12,000 to 25,000 BTUs, models that will cool larger spaces such as a large suite, entire apartment and small home.

Noise Levels:

42 - 59 dB

Cooling Capacity:

5,000 - 25,000 BTU

EER Rating:

12.2 - 15

Room Size:

250 - 1300 sq. ft.

Quietest 5,000 to 10,000 BTU Window Air Conditioners

Each of these units has a sound range that is lower than average for its size. Sound reduction is produced through quieter compressors or the use of extra insulation.

#1 Haier Serenity ESAQ406T 6,000 BTU

Built to use as little energy as possible, this Energy Star certified unit might be the quietest window air conditioner available. Running on low fan speed, it’s just 43 decibels.

The Haier Serenity window air conditioner has plenty of comfort features too including 4 modes: Cool, energy saving, dehumidify for those damp/cool days and fan-only went you want to freshen the air without cooling.

haier quiet window ac
  • Pros: Feature-rich design, minimal energy use and it is not loud!
  • Cons: A small percentage of these window ACs don’t cool properly out of the box due to a faulty compressor. If you get one of the few bad ACs, you can return it to Amazon for a full refund, but the process is a hassle.

Bottom line: If you want to cut cooling costs in a small room plus have a peaceful night’s sleep, this unit is worth the risk.

#2 LG 7,500 115V with Supplemental Heat

LG introduced a powerful new window AC with the added bonus of supplemental heat for chilly spring and fall days.

It has 2 cooling speeds, fan speeds and heat settings. The LG 7,500 BTU window unit uses a standard 115V outlet. Convenience feature: a 24-hour timer.

lg quiet ac with heat
  • Pros: Consumers give it reviews for reliability and the ability to cool the space. Heat too!
  • Cons: While the heat is nice, don’t expect it to warm up your space a whole lot. This unit is a little heavy too.

Bottom line: If you love the convenience of wi-fi control and are willing to pay a few bucks more for it, this is a good fit.

#3 Friedrich Chill Premier 8,000 BTU

This Friedrich Chill 8K window air conditioner is an updated unit that offers you better features and convenience, things homeowners are looking for in their appliances. This is a WiFi-enabled AC you can control from anywhere using the FriedrichGo app and a smart device – and efficient way to save energy costs and make sure your room or zone is comfortable when you arrive by boosting the AC an hour earlier.

If you’re looking for a premium window air conditioner and are willing to pay a little more, then Friedrich is one to consider. Full-function remote and timer included.

This unit is a classic slide-out with a chassis you can permanently leave in the window or wall. 

Friedrich Chill Premier
  • Pros: Energy Star certified for efficiency. Excellent quality, WiFi for mobile control, and it can be synced to your smart home system like Google Home. Works with Alexa too. Friedrich claims it is 25% quieter than some comparable ACs. Cools around 200-250 square feet depending on insulation and room conditions. 8-way airflow ensures every part of the room gets cooled evenly.
  • Cons: It is a little pricier than others on the list.

Bottom line: If you enjoy premium brands – Wolf, Miele, SubZero and similar, you’ll appreciate what this Friedrich Chill window/wall AC delivers.

#4 Frigidaire FFRE1033S1 10,000 BTU

Frigidaire is one of the top window AC brands in ratings for quality and reliability. This quiet window unit shows why.

It is one of the few window air conditioners with an air purifying ionizer that electrostatically traps small particles.

The Frigidaire FFRE is Energy Star rated and ideal for bedroom suites, large family rooms and average-sized living rooms.

  • Pros: Low-decibel cooling, energy efficient, air purifier, Cool/Econ/Fan-only modes.
  • Cons: Some users report that Econ mode doesn’t cool as well as Cool mode, but that is to be expected, especially in humid weather. We recommend Econ mode for days when the air humidity is not high.  

Bottom line: When you want a rock-solid yet competitively priced window AC that won’t disturb your P&Q, consider this unit.

#5 Midea U Inverter Window Air Conditioner

Are you tired of your window air conditioner being unsteady in the window? Afraid it’s going to fall out? This Midea U-shaped window air conditioner offers the most secure fit of any AC you can buy.

Midea is a newer brand known for quality performance and Energy Star efficiency. There’s more. This is a smart window AC with mobile app and Alexa control for convenience and energy cost savings. 

Midea U Inverter Window Air Conditioner
  • Pros: Secure fit. Energy Star certified. Save 35% on energy use and cost compared with non-Energy Star models. The U-shaped design, with more window between you and the noisy part of the AC means less sound penetration into your room. Use Alexa, Google Assistant or the WiFi app for optimal convenience.
  • Cons: It often requires two people to install the AC into the window – but that is not uncommon for any window air conditioner.

Bottom line: If you need basic, dependable cooling and want to save money on a quiet window AC, this is a great choice.

Quietest 12,000 to 25,000 BTU Window Air Conditioners

#6 LG LW1216ER 12,000 BTU

This LG window air conditioner exhibits quiet, efficient cooling with lots of features. It does a great job of removing humidity too, and cool, dry air is the most comfortable.

The features include digital controls with remote, 3 fan speeds including Auto mode and 24-hour programmable timer.

  • Pros: Energy Saver mode for warm days and nights when not a lot of cooling is needed. Feature-rich design, slide-out filter is easy to maintain.
  • Cons: This unit is quite heavy, so it will be helpful to have an extra person to help install it. Some prefer to have it professionally installed by a handyman.

Bottom line: If you need dependably cool and dry air in a fairly large area, this quiet LG window unit will do the job.

#7 Koldfront WAC18001W 18,500

We’ve been impressed with this big, powerful window air conditioner that cools 700-1,000 square feet, depending on how hot the room usually gets.  

Heat – This unit has a heating element that delivers 16,000 BTUs of heat. It’s not a true heat pump window air conditioner.

Keep in mind it requires a 230-volt outlet, just like all units this size. Koldfront has become a leader in quality and performance, and the high ratings this unit receives bears that out. 

Koldfront WAC18001W


Large-capacity cooling. Heat – mostly for supplemental heating, but it will keep the room toasty warm by itself as long as it isn’t freezing cold outside. The efficiency is decent.

Features include 3 fan speeds and 4-way airflow. 24-hour timer. Remote. Dehumidifier Mode removes humidity without cooling the air (for cool, clammy days).

This is part of a huge lineup of quality Koldfront ACs, all with good ratings. If you need other sizes, choose the link, scroll down and pick your ACs.


Requires a 230-volt outlet, like you use for a dryer or electric range, and you might have to have that installed. And it is heavy, but again, so are all units this size.

Bottom line: When you need to cool a large area such as a bonus/living room, home theater, owners/masters suite or small apartment, this Koldfront 18,500 BTU with supplemental heat should serve you well.

#8 Frigidaire FFRE1833U2 18,000 BTU

Frigidaire is one of the most trusted names in the appliance industry and has the ratings/reviews to back up the reputation.

This is a high-capacity 18,000 BTU AC that requires a 230-volt outlet, as all units this size require.

Frigidaire FFRE1833U2
  • Pros: Large capacity to cool up to 1,000 square feet in a single zone or small home/apartment. It has all the features you’d like – remote with a temperature sensor in it, so the AC doesn’t stop cooling until the air at the remote is properly cool. Keep the remote nearby to assure your space is cool, dry and comfortable.
  • Cons: Like all window air conditioners, it works better in an open floor plan where air can circulate, rather than where small rooms make up the space. It’s heavy and requires a 230V outlet – standard for units this size.

Bottom line: Supplemental heat makes this unit a good choice for large spaces inadequately heated and cooled by a central HVAC system and for part-time places like the cabin or guest apartment.

#9 LG LW2217IVSM 22,000 BTU

The inverter-driven compressors place this unit among the quietest window air conditioners with operating level as low as 44 decibels.

These compressors also deliver the most efficient, comfortable and precise temperature control.

This is an Energy Star window air conditioner that is affordable.

  • Pros: 40% more efficient than other large window units. Outstanding climate control and a full range of convenience features like a remote control, 24-hour timer and wi-fi connection.
  • Cons: Very little to dislike about this unit. It is quite heavy, so having it professionally installed might be worth the cost.

Bottom line: This unit offers the best value in this list – outstanding efficiency at a reasonable price.

#10 Frigidaire FFRH2522R2 25,000 BTU

This window air conditioner proves that big doesn’t have to mean loud. Quality design and a heavy layer of sound insulation reduce operating noise.

The unit also has a 16,000 BTU supplemental heat source that can keep the space warm as long as outside temperatures are 45F and above.

  • Pros: 8 pints per hour dehumidification makes indoor air much more comfortable. Energy saving mode and low-power start reduce energy use. Quiet operation for such a large window unit.
  • Cons: You’ll need help installing this large, heavy AC. Extra support might be required.

Bottom line: This unit costs a fraction of what a 24,000 (2-ton) BTU central AC costs. And the supplemental heat is nice for climates where winters are mild but sometimes chilly.

Quietest Window Air Conditioners Buying Guide

This buying guide offers tips for finding a quiet window air conditioner with the features and performance you want.

Quiet is Relative

As you shop for the quietest window air conditioners, remember one important reality: The larger it is, the louder it will be, all else being equal. So, you simply cannot expect the quietest 18,000 BTU window AC to be as quiet as a “normal” sounding 6,000 BTU unit. I’m sure you know that, but we like to remind readers of this page that quiet is relative when it comes to dogs, well some little ones can be pretty loud, but for sure window ACs. 

Do you want the quietest window AC in its class? Once you get into larger window air conditioners, the quietest window AC in each size will have one or two inverter compressors. They run more evenly, without highs and lows, so the mean operating noise level is lower than for those with standard on/off or hi/low compressor function. This is explained in detail in the section below titled Quiet Air Conditioners: Key Factors. 

See some of the LG and Friedrich models in the list such as the Midea U and the LG LW2217IVSM have inverter compressors.

Pros and Cons of a Quiet Window AC

There are advantages and a few disadvantages to consider before making your purchase.

Pros: The chief benefit is obvious – less noise means that the AC won’t keep you awake at night, make it hard to hold a conversation or generally be a sound nuisance in your home.

Cons: These are potential problems, but they can be avoided by shopping carefully and following the tips in this guide.

  • Too small: Many window air conditioners are marketed as “quiet” because they are small – 5,000 or 6,000 BTUs. If you buy an AC that’s too small for the space, the unit won’t keep your air cool and dry.
  • Not powerful enough: Sometimes even larger ACs in the 10,000 to 16,000 BTU range are called “quiet,” but it’s because they simply don’t put out enough cooling power or the fan isn’t strong enough to move cool air to the furthest areas of the room. Avoid them by reading reviews from other users, especially the negative reviews. The window air conditioners in our Quietest Window AC list are all adequately powered for their size.

Quiet Window Air Conditioners: Key Factors

As you consider your options, research these features.

Compressor: The compressor is the pump in the AC that circulates refrigerant. It’s what you hear “kick in” when the unit starts to cool. The compressor is also the loudest part of the AC.

The quietest compressors are inverter type compressors. Rather than just turning on at 100% capacity, they’re like dimmer switches. They run at higher or lower capacity, choosing the lowest (and quietest) capacity needed to get the cooling job done.

The LG LW2217IVSM in the list above has an inverter-driven compressor. That’s why it’s one of the quietest window air conditioners even though it has a large 22,000 BTU capacity.

If that’s too big for your needs, you might be interested to know that LG makes the 17IVSM Series in two other models.

14,000 BTU LW1517IVSM: check its link here.

18,000 BTU LW1817IVSM: check its link here.

See the Midea U Converter-driven Window AC here.

Both are rated very high and are very quiet. While a little pricey, the LG 17IVSM Series might be the best all-around window air conditioners available.

Insulation: There is a “sound blanket” of insulation inside the unit that muffles noise.

The AC should also come with a strip of insulation that goes between it and the window. The insulation stops air leaks, of course, but it also prevents vibration noise.

Placing weather stripping beneath and at the sides of the unit might also reduce noise a little bit. It’s hard to make a loud compressor quiet whatever you do, so it makes sense to choose a quiet AC to start with.

Multiple Speeds: Most units have fans with 3 or 4 speeds. Obviously, the lower the speed, the less noise it makes.

Now, here’s the important tip: Choose a window AC with enough capacity to adequately cool your room/space when running on one of the lower fan speeds.

For example, let’s say you have a 250 square foot room to cool. That would require a 6,000 or 7,000 BTU AC.

  • If it’s a bedroom and the bed is near the window, then a 6,000 BTU unit will keep you cool at night on a low fan speed.
  • If the bedroom is across the room, then a 7,000 or 8,000 BTU unit would be a better choice, since it would have the power to reach you on a low fan speed.

Why Correct Size is Important

Let’s talk more about window air conditioner size and why it is important. Sizes range from 5,000 to 24,000 BTUs for most models, though a few are more than 30,000 BTUs.

Undersized window air conditioners: They won’t cool the room, and you’ll have to run them at the highest fan speed to try to get air to the entire room. The result will be a warm, noisy room, and that’s a bad combination.

Oversized window units: It’s tempting to get a window air conditioner that is bigger than necessary to make sure it adequately cools the room.

However, if it is too large, it will cool the room too fast. Why is that a problem? Because it won’t remove much humidity in the process. You’ll have a cool, clammy room, another bad combination.

Did you know that you feel just as comfortable at a higher temperature when the air is dry?

76 degrees and 25% humidity feels as comfortable as 72 degrees and 60% humidity.

At it costs less to cool a room to 76 degrees than it does to cool it to 72.

Stick to the window air conditioner size chart below.

Area To Be Cooled (square feet)

Capacity Needed (BTUs per hour)

100 up to 150

150 up to 250

250 up to 300


300 up to 350

350 up to 400


400 up to 450

450 up to 550

550 up to 700

700 up to 1,000


1,000 up to 1,200


1,200 up to 1,400


1,400 up to 1,500


1,500 up to 2,000


2,000 up to 2,500


  • If the room is on the sunny side of the house and not shaded, or if cooling a kitchen and you have the oven on a lot, then go up one level.
  • If the room often has more than one or two people in it, you should go up a level for that too.

There’s a step-by-step sizing guide in our comprehensive Window Air Conditioner Buying Guide.

Shopping for the Quietest Window AC: What to Consider

See our Buying Guide for full details on how to choose a window unit with the right size, efficiency and features you want.

We discussed room size above.

Here are more important considerations.


Window air conditioners range from standard efficiency to more efficient units that are Energy Star certified.

In any window AC series (and in split system ACs and ductless systems too), the smallest model is the most efficient, and they get less efficient as they get bigger. Here’s an example.

Haier QHC Series window air conditioner CEER ratings:

  • 8,000 BTUs: 12.0
  • 10,000 BTUs: 12.0
  • 12,000 BTUs: 12.0
  • 15,000 BTUs: 11.8
  • 18,000 BTUs: 11
  • 24,000 BTUs: 10.3

CEER rating is the combined energy efficiency rating, the new rating system that measures the unit’s efficiency when running plus when plugged in but not running.

Q: How efficient should a window AC be?

A: It depends on three factors:

1. If you want the greenest AC available, pick the one with the highest CEER rating.

2. ACs that are a main source of cooling should be very efficient. If you plan to use the window AC for supplemental cooling, so it won’t run as much, then a lower efficiency is OK.

3. The hotter your climate is, the more efficient the unit should be.

Popular Features and Their Benefits

Here is a brief summary of your feature options. There are more details in our Window AC Buying Guide.

Of course, the better the features, the higher the average cost of the unit will be.

Digital controls vs. knobs. ACs with digital controls cost more but offer more precise cooling and other features only possible with computer-controlled functionality.

Timer and programmable start: These features allow you to plan when the AC turns on and off and for how long it runs. This allows you to control energy use and program the unit to cool your room or space before you arrive home.

Wi-fi: Window units with wi-fi connectivity allow you to control them remotely with an app. It’s the surest way to reduce energy use and still have a comfortable room/zone/apartment/home.

Sleep mode, econ mode, energy saver mode: These are all names for similar features that reduce AC output and energy use when you’re asleep or away for a short while.

Fans speeds and fan-only mode: Window units have 2-4 fan speeds. Some have fan-only mode. Fan speeds give you climate control options. Fan only mode creates a breeze when you want the air to move but don’t need cooling.

Auto restart after outage: With this feature, the unit will turn on and return to your settings when power is restored. This is a great feature if you experience frequent power outages during spring and summer storms.

Remote: Being able to adjust the AC temperature or other settings from across the room or from another room is very convenient.

Fresh air option: According to the EPA, indoor air pollution is a major concern when homes are tightly built and windows aren’t opened regularly. This option exchanges fresh outside air for polluted indoor air.  It can be used during cool times of the day to improve indoor air quality.

Ionizer: An ionizer is an air cleaner that captures pollutants through an electronic charge. Frigidaire FFRE Series is the only series from a major brand equipped with an ionizer. An ionizer is a type of electronic air cleaner (EAC). Our Air Cleaner guide includes a section on EACs and their pros and cons.

How to Make a Window AC Quiet & Keep it Quiet

These window air conditioner buying tips will help you choose the quietest window unit that meets your size requirements.

Choose the largest window unit in the suitable range for your space, and run it on a low fan speed. For example, if you have 550 square feet to cool, then either a 12,000 or 14,000 BTU unit is recommended. Choose the 14K model and keep it at a low fan speed.

Use the insulating foam provided – and add more. The foam will prevent vibration noise and will muffle noise from the compressor, which is outside, and prevent it from leaking into the house through gaps in the insulation. You can buy foam weather stripping for filling any air gap. It’s inexpensive.

Put an awning over the AC window if it gets direct sunlight. The sun shining directly on the AC will heat it up and make it run too much, even when indoor air is comfortable. Keeping sunlight off it will reduce noise and energy use.

Use LED lights in the room. Non-LED lightbulbs heat up, and if they’re near the AC, might cause it to run when its not needed, creating unnecessary noise.

Clean the filter regularly. A dirty filter won’t allow fresh air into the unit. It might produce a wheezing sound as air is sucked through any gap it can find, or the unit might overheat, causing it to run too much. Either effect is noisy.

Clean the coil and compressor yearly. This will prevent a buildup of dirt, algae and debris, all of which can make noise if they impede the blower fan.

These tips will make the unit the quietest window air conditioner it can be.

Energy Costs of a Window Air Conditioner

There are three factors in how much a window unit costs to run.

1. Size: As we noted, in any given series, the smallest unit will be more efficient than larger units. There’s not much you can do about this. You certainly don’t want an undersized window air conditioner, or it won’t adequately cool your home.

2. Efficiency: The higher the CEER rating, the more economically the unit uses energy. At the very least, choose an Energy Star model if you want to reduce operating costs. If you don’t mind digging into the details, compare the CEER ratings on models you’re considering.

3. How often you run the AC: There’s more to this story than the obvious fact that a unit that runs more will use more energy. If you spend most of the day in one or two rooms – the kitchen and a living room or home office, for example, it might be more economical to use one or two window units to cool just the space you’re using than to use central AC to cool a mostly-empty house.

Window AC Energy Guides: You’ve probably seen the yellow card on boxes and webpages called the Energy Guide.

The Energy Guide tells you how much electricity the unit uses in an average setting and at average electricity prices.

Comparing Energy Guides head to head is the most exact way of determining which unit will cost you less to run.

For example, compare two 18,000 BTU window units.

The Haier QHM18DX has a CEER rating of 11.8. It’s Energy Guide says it will cost $148 per year to run in the average home.

The LG LW1817IVSM is a 14.7 CEER unit. It’s annual operating cost is just $81.

Summary of Essentials

It’s really pretty easy to choose the quietest window air conditioner for your purposes.

  • 1
    Size it properly
  • 2
    Locate information on the operating noise level found on the manufacturer literature
  • 3
    Compare models you’re considering head to head
  • 4
    Read user reviews and look for information on noise level
  • 5
    Use the buying tips here to find a unit that is not just a quiet window air conditioner, but one with the features and energy efficiency you want

2 thoughts on “10 Quietest Window AC Units in 2021 (Quieter Than a Library)”

  1. I have a 23,000 LG unit, I have tooooo much trouble finding anyone that will come out to repair it, just had someone come out and they had no clue what they were doing I paid $408.00 for nothing done. Thoughts on me getting a 14,000 btu portable air conditioner with heat, I am done trying to get people out here to fix a big heavy unit I can not lift? This is for at least 1,000 sq ft and my only source of air and heat.

  2. My house is 1,135 sq ft. I need to know which window unit to buy is it 22,000 btu’s want whole house with one unit to be cool and energy efficient


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