20 Best Small Quiet Air Conditioner [2024]

Are you looking for the best small quiet air conditioner? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling small quiet air conditioner.

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# Preview Product
1 RecPro RV Air Conditioner 15K Ducted | Quiet AC with Heat Pump for Heating or Cooling | RV AC Unit |... RecPro RV Air Conditioner 15K Ducted | Quiet AC with Heat Pump for Heating or Cooling | RV AC Unit...
2 Soleus Air Exclusive 6,000 BTU Energy Star First Ever Over The Window Sill Air Conditioner... Soleus Air Exclusive 6,000 BTU Energy Star First Ever Over The Window Sill Air Conditioner...
3 LG LP1419IVSM Smart Dual Inverter Portable Air Conditioner with 10000 BTU Cooling Capacity, 500 sq.... LG LP1419IVSM Smart Dual Inverter Portable Air Conditioner with 10000 BTU Cooling Capacity, 500...
4 Midea 8,000 BTU U-Shaped Smart Inverter Window Air Conditioner–Cools up to 350 Sq. Ft., Ultra... Midea 8,000 BTU U-Shaped Smart Inverter Window Air Conditioner–Cools up to 350 Sq. Ft., Ultra...
5 Emerson Quiet Kool 5,000 BTU 115V Window Air Conditioner with Mechanical Rotary Controls | Cools... Emerson Quiet Kool 5,000 BTU 115V Window Air Conditioner with Mechanical Rotary Controls | Cools...
6 Shinco 10,000 BTU Portable Air Conditioners with Built-in Dehumidifier Function, Fan Mode, Quiet AC... Shinco 10,000 BTU Portable Air Conditioners with Built-in Dehumidifier Function, Fan Mode, Quiet...
7 Emerson Quiet Kool Electronic Window Air Conditioner, 5,000 Btu 115V, with LED Display and Remote... Emerson Quiet Kool Electronic Window Air Conditioner, 5,000 Btu 115V, with LED Display and Remote...
8 BLACK+DECKER Air Conditioner, 14,000 BTU Air Conditioner Portable for Room and Heater up to 700 Sq.... BLACK+DECKER Air Conditioner, 14,000 BTU Air Conditioner Portable for Room and Heater up to 700...
9 Koldfront WTC12001W 12,000 BTU 208/230V Through the Wall Heat/Cool Air Conditioner Koldfront WTC12001W 12,000 BTU 208/230V Through the Wall Heat/Cool Air Conditioner
10 Whynter ARC-14S 14,000 BTU (9,500 BTU SACC) Dual Hose Portable Air Conditioner, Dehumidifier, Fan... Whynter ARC-14S 14,000 BTU (9,500 BTU SACC) Dual Hose Portable Air Conditioner, Dehumidifier, Fan...
11 Midea Duo 12,000 BTU (10,000 BTU SACC) HE Inverter Ultra Quiet Portable Air Conditioner, Cools up to... Midea Duo 12,000 BTU (10,000 BTU SACC) HE Inverter Ultra Quiet Portable Air Conditioner, Cools up...
12 GE Electronic Air Conditioner for Window | 6,000 BTU | Ultra-Quiet, Serentiy Series | Easy Install... GE Electronic Air Conditioner for Window | 6,000 BTU | Ultra-Quiet, Serentiy Series | Easy...
13 Windmill Air Conditioner: Smart Home AC - Easy to Install - Quiet - Energy Efficient - Side... Windmill Air Conditioner: Smart Home AC - Easy to Install - Quiet - Energy Efficient - Side...
14 De'Longhi PACAN120EW 3-in-1 Portable Air Conditioner, Dehumidifier & Fan + Arctic Cool Quiet Mode,... De'Longhi PACAN120EW 3-in-1 Portable Air Conditioner, Dehumidifier & Fan + Arctic Cool Quiet...
15 Frigidaire FFRA051WAE Window-Mounted Room Air Conditioner, 5,000 BTU with Temperature Control and... Frigidaire FFRA051WAE Window-Mounted Room Air Conditioner, 5,000 BTU with Temperature Control and...
16 DELLA 9000 BTU Mini Split Air Conditioner & Heater Ductless Inverter System, 20 SEER, 8 HSPF Energy... DELLA 9000 BTU Mini Split Air Conditioner & Heater Ductless Inverter System, 20 SEER, 8 HSPF...
17 RecPro RV Air Conditioner Low Profile 9.5K Non-Ducted | Quiet AC | Cooling Only | RV AC Unit |... RecPro RV Air Conditioner Low Profile 9.5K Non-Ducted | Quiet AC | Cooling Only | RV AC Unit |...
18 Emerson Quiet Kool EARC15RE1 15,000 BTU 115V Window Air Conditioner with Remote Control, White Emerson Quiet Kool EARC15RE1 15,000 BTU 115V Window Air Conditioner with Remote Control, White
19 BLACK+DECKER 8,000 BTU Portable Air Conditioner with Remote Control, White BLACK+DECKER 8,000 BTU Portable Air Conditioner with Remote Control, White
20 DELLA 6000 BTU 115V/60Hz Energy Saving Window Air Conditioner, Whisper Quiet AC Unit with Remote,... DELLA 6000 BTU 115V/60Hz Energy Saving Window Air Conditioner, Whisper Quiet AC Unit with Remote,...
Bestseller No. 1
RecPro RV Air Conditioner 15K Ducted | Quiet AC with Heat Pump for Heating or Cooling | RV AC Unit |...
  • Remote control with cooling, dehumidifying, dry, sleep, timing, and other functions (stored inside AC unit display for protection during shipping)
  • Temperature control for rooms up to 835 square feet
  • Best installed on a flat roof - less than 5 degrees inclination
  • Does not work with other brand wall thermostats
Bestseller No. 2
Soleus Air Exclusive 6,000 BTU Energy Star First Ever Over The Window Sill Air Conditioner...
  • DESIGN: Exclusive Soleus Air design combines the benefits of a portable ac, window ac and mini-split ac into a simple format
  • SIMPLE INSTALLATION: Simply slide the saddle air conditioner over the window sill for a safe installation without any tools required or risks of the...
  • WIFI & MYTEMP REMOTE: Activate the MyTemp sensor on the remote control and relax anywhere in the room while the air conditioner cools to your exact...
  • ENJOY THE VIEW: Keep the view outside and full use of your window even after installation without having to remove the air conditioner
  • SIMPLE OPERATION: Electronic controls and LCD remote control keep all of the industry-leading features at your fingertips. Washable and reusable...
SaleBestseller No. 3
LG LP1419IVSM Smart Dual Inverter Portable Air Conditioner with 10000 BTU Cooling Capacity, 500 sq....
  • 10,000 BTU (U.S. DOE)/ 14,000 BTU (ASHRAE)
  • Estimated Cooling Area 500 Sq. Ft
  • Efficient, Energy Saving Inverter Technology
  • Optimal Low Noise Performance
Bestseller No. 4
Midea 8,000 BTU U-Shaped Smart Inverter Window Air Conditioner–Cools up to 350 Sq. Ft., Ultra...
  • ULTRA QUIET - The Midea U Smart Inverter AC unit is 9 times quieter than traditional units. The U-shape design uses your window to blocks noise...
  • MORE THAN 35% ENERGY SAVINGS - With the advanced DC Inverter technology, Midea U achieves over 35% energy savings compared to other traditional units,...
  • FLEXIBLE WINDOW OPENING - Midea U-shaped design allows your window to open, bringing fresh air into your home anytime and allowing you to maintain...
  • SMART CONTROL - The Midea U Smart Inverter Air Conditioner is Wi-Fi enabled and can be controlled from anywhere through the cloud using the MideaAir...
  • ROBUST INSTALLATION - Install the included quick-snap bracket, set the unit on the bracket, and secure the sidearms. After that, you are all done and...
Bestseller No. 5
Emerson Quiet Kool 5,000 BTU 115V Window Air Conditioner with Mechanical Rotary Controls | Cools...
  • 5,000 BTU air conditioner for window-mounted installation cools a room from 100 to 150 sq. ft.
  • 1-2-5 years warranty (1 year labor, 2 years parts and 5 years compressor)
  • Mechanical rotary controls with 2 cooling speeds, 2 fan speeds and variable temperature dial
  • Excess moisture removal up to 1.3 pints per hour for a more comfortable environment
  • Quiet operation keeps you cool and comfortable without keeping you awake (on low dBA = 50). Emerson Quiet Kool window air conditioner was designed...
Bestseller No. 6
Shinco 10,000 BTU Portable Air Conditioners with Built-in Dehumidifier Function, Fan Mode, Quiet AC...
  • 【EASY-COOL】- Compact 10,000 BTU Portable Air Conditioner Unit, Delivers Fast, Cooling for Spaces Up to 300 Sq.Ft in home, bedrooms, dorms,...
  • 【3-in-1 FUNCTIONALITY】- It has 3 modes to choose from - cooling, dehumidification and fan. The 3-speeds fan can satisfy your needs and cool your...
  • 【EASY-TO-USE】- LED display and simple selections panel,full-featured remote, 24-hr timer, plus a quiet <52dB output on Low-speed mode for...
  • 【QUICK INSTALLATION】- Your purchase includes: Portable Air Conditioner, Window Mount Kit, Manual, Remote Control. Move your air conditioner to the...
  • 【Perfect After Service】- A Window is mandatory and necessary for it to work. All Shinco Portable Air Conditioner Units are covered with 30-Days...
Bestseller No. 7
Emerson Quiet Kool Electronic Window Air Conditioner, 5,000 Btu 115V, with LED Display and Remote...
  • QUIET COOLING: This 5,000 BTU window air conditioner efficiently cools up to 150 sq. ft. At 52dB, this unit is among the quietest in the industry,...
  • SMART-FIT SIZING: With dimensions of 16” W x 12” H, this Emerson Quiet Kool window air conditioner was designed with Smart-Fit dimensions, meaning...
  • PROGRAMMABLE TIMER AND SLEEP MODE: Integrated 24-hour timer can be set via on-board controls or remote control. Intelligent sleep mode takes it one...
  • EXCLUSIVE 1-2-5 WARRANTY: Your Emerson Quiet Kool Wi-fi enabled air conditioner comes with an industry-exclusive 1-2-5 warranty that covers 1 year of...
  • SPLIT AIR EXHAUST VENTS: Two air exhaust vents (instead of one) combine with three fan speeds to give you 8-way flexibility to direct the flow of cold...
SaleBestseller No. 8
BLACK+DECKER Air Conditioner, 14,000 BTU Air Conditioner Portable for Room and Heater up to 700 Sq....
  • Portable AC: Use our personal air conditioner & heater (16.5" x 11.7" x 27.9") in rooms up to 700 sq. ft. Stay cool in summer & warm in winter with...
  • 4-in-1: Our 14000 btu portable air conditioner & 11,000 BTU heater has a dehumidifier & fan. This ac unit for bedroom (63 lbs.) comes with a remote...
  • Great Features: Set the right temperature with this ac portable air conditioner. Our portable air conditioner and heater also has a slide-out washable...
  • Easy Mobility: Thanks to casters on the bottom and side handles on both sides of the small air conditioner, this air cooler & heater and fan combo can...
  • Installation Kit: When it comes to fans that blow cold air, this indoor ac unit includes an easy-to-install window kit. A large, vented airflow outlet...
Bestseller No. 9
Koldfront WTC12001W 12,000 BTU 208/230V Through the Wall Heat/Cool Air Conditioner
  • 12000 BTU cooling: 1330W/6.6A; 10600 BTU heating: 3450W/15.5A
  • 450-550 sq. ft. coverage area; remote control included
  • 4-way air directional louvers; Three (3) fan speeds; Four (4) operation modes
  • Compatible with the Koldfront wall air conditioner sleeve (WTCSLV) sold separately
  • Dehumidification capacity: approximately 60 pints/day; Input voltage: 208/230 V/60 Hz; EER 9.5
SaleBestseller No. 10
Whynter ARC-14S 14,000 BTU (9,500 BTU SACC) Dual Hose Portable Air Conditioner, Dehumidifier, Fan...
  • AWARD-WINNING: Good Housekeeping's 2022 "BEST OVERALL PORTABLE AIR CONDITIONER Provides powerful cooling over large areas"
  • POWERFUL & QUIET: 14,000 BTU (ASHRAE) / 9,500 BTU (SACC) cooling capacity; Noise level (dBA): <56
  • ADVANCED SELF-EVAPORATION: Dual hose operation; Cools up to a 500 square foot space (ambient temperature and humidity may influence optimum...
  • MULTI-FUNCTIONAL & ENERGY SAVING: Three operational modes: Cool, Dehumidify, and Fan; Full thermostatic control (61°F – 89°F); Maximum power...
  • EASY TO SETUP & PORTABLE: Extendable exhaust hose (up to 60″) 5.9" diameter; Window kit dimension: 6.5″ W x 20″ L (minimum), 46″ (maximum);...
Bestseller No. 11
Midea Duo 12,000 BTU (10,000 BTU SACC) HE Inverter Ultra Quiet Portable Air Conditioner, Cools up to...
  • INNOVATIVE DUO HOSE DESIGN - Midea's industry-first hose-in-hose design enables the unit to intake and exhaust air outdoors. The hose-in-hose portable...
  • INVERTER TECHNOLOGY - Engineered with the variable-speed inverter technology, Midea Duo Inverter portable air conditioner cools more with considerably...
  • MORE THAN 2X FASTER AND STRONGER COOLING - Empowerd by the Duo hose design and an optimized air duct system, Midea Duo can lock and maximize cooling...
  • 42dB ULTRA-QUIET OPERATION - The sound level of Midea Duo is as low as 42dB when cooling. That is almost as quiet as a library.
  • SMART WI-FI, WORKS WITH ALEXA/GOOGLE ASSISTANT - Wi-Fi module enables you to control from anywhere with the Midea Air smartphone app or by voice...
Bestseller No. 12
GE Electronic Air Conditioner for Window | 6,000 BTU | Ultra-Quiet, Serentiy Series | Easy Install...
  • COOLS SMALL ROOMS - Delivers 6,000 BTU cooling capacity for small rooms up to 250 sq ft
  • ULTRA QUIET - This AC provides ultra quiet operation at only 43 dBs for minimum noise
  • MAXIMUM COMFORT COOL Energy efficient cooling with three cooling and three fan speeds provide flexible and optimal home comfort
  • SLEEP MODE - This feature gradually increases temperatures overnight so you can sleep comfortably
  • EASY INSTALLATION- This AC has a fixed chassis and installs easily in a double hung window with included EZ Mount installation kit
SaleBestseller No. 13
Windmill Air Conditioner: Smart Home AC - Easy to Install - Quiet - Energy Efficient - Side...
  • NO PRE-ASSEMBLY WITH THE EASIEST ROOM AIR CONDITIONER INSTALLATION KIT POSSIBLE: We pre-assembled the install kit for you, so it’s ready to go out...
  • NO PRE-ASSEMBLY WITH THE EASIEST ROOM AIR CONDITIONER INSTALLATION KIT POSSIBLE: We pre-assembled the install kit for you, so it’s ready to go out...
  • A QUIET AC TO REALLY MAKE YOUR HOME MORE COMFORTABLE: With curved edges, clean lines, and an auto-dimming LED display, Windmill is the smart window...
  • ENJOY MORE EFFICIENT COOLING THAT’S GOOD FOR THE PLANET: The top vents blow air up and out into the room at the perfect angle for better airflow –...
  • CONTROL YOUR AC ANYWHERE, ANYTIME: The Windmill AC is WiFi- and app-enabled for iPhone and Android. Turn it on 10 minutes before you get home on a...
Bestseller No. 14
De'Longhi PACAN120EW 3-in-1 Portable Air Conditioner, Dehumidifier & Fan + Arctic Cool Quiet Mode,...
  • POWERFUL YET QUIET: Cool rooms up to 450 square feet in total area with 50% less noise
  • SAVE ENERGY, COOL THE ROOM YOU’RE IN: By cooling only the room you’re in, you can raise your household thermostat and lower your energy bills
  • NO LEAKS: No-drip technology automatically recycles condensation within the unit, helping to prevent any type of leaks
  • NO TOOLS REQUIRED: Unit sets up in minutes. Caster wheels and handles allow you to move it easily from room to room
  • USER-FRIENDLY: Features electronic controls with easy-to-read lighted display, adjustable thermostat, 3 fan speeds, mode selection, 12-hour on/off...
Bestseller No. 15
Frigidaire FFRA051WAE Window-Mounted Room Air Conditioner, 5,000 BTU with Temperature Control and...
  • Effortless Temperature Control: Our air conditioners maintain the preset room temperature, so you will remain comfortable at all times.Controller...
  • Easy-to-Clean Washable Filter: Capture dust from the air and keep your dehumidifier working efficiently with our easy-to-clean washable filter
  • SpaceWise Adjustable Design Optional Side Panels: With the Adjustable Side Panels, the side panels will extend to best fit your window
  • Power Cord: Comes with an extra long three-prong cord — makes extension cords unnecessary
  • Effortless Restart: Automatically resumes operating at its previous settings when power is restored to your unit
Bestseller No. 16
DELLA 9000 BTU Mini Split Air Conditioner & Heater Ductless Inverter System, 20 SEER, 8 HSPF Energy...
  • [ENERGY EFFICIENT COOLING] This 9,000 BTU/h, 20 SEER, 115V, 8 HSPF, AHRI Certified pre-charged air conditioner and heater unit features a ductless...
  • [AUTOMATIC SYSTEM] This air conditioner is designed with several smart settings that make it easy to use: auto defrost, self-diagnosis/cleaning, I...
  • [SMART SENSOR] The unit will sense room temperature at the remote control, instead of at the indoor unit during cooling mode. It then adjusts airflow...
  • [QUIET OPERATION] This air conditioner is ultra silent at only 30-41 dBa. The unit provides equal airflow in every part of your room and can adjust to...
  • [AMPLE COVERAGE] This unit provides cooling and heating for up to 750 square feet and is able to work in environments as low as -4 degrees Fahrenheit....
Bestseller No. 17
RecPro RV Air Conditioner Low Profile 9.5K Non-Ducted | Quiet AC | Cooling Only | RV AC Unit |...
  • The remote that is included with the model allows you to control the temperature and settings of the unit from the comfort of your couch.
  • Unlike other models that are made of cheap plastic that has been molded to shape around the unit, these are made from high-quality, tough plastic...
  • The small size allows you to take full advantage of the air conditioner while not sacrificing as much in the way of roof space or interior ceiling...
  • The maximum power input of this unit is 1590 Watts and the maximum current is 14.6 Amps, leading to an energy efficiency rating of 5.97 watts per BTU.
Bestseller No. 18
Emerson Quiet Kool EARC15RE1 15,000 BTU 115V Window Air Conditioner with Remote Control, White
  • Dimensions: 25.4" D x 23.6" W x 17.9" H | Window opening maximum width (in.): 41 | Window opening minimum height (in.): 19 | Window opening minimum...
  • 15,000 BTU 115V window air conditioner with remote control
  • Energy Star  approved unit uses less energy and saving money on utility bills
  • Quiet operation keeps you cool and comfortable without keeping you awake
  • Remote Control offers you the flexibility to control the temperature and fan speed from anywhere in the room
SaleBestseller No. 19
BLACK+DECKER 8,000 BTU Portable Air Conditioner with Remote Control, White
  • QUIET & POWERFUL - Our 4,000 BTU (8,000 BTU ASHRAE) compact air conditioner (16.5 x 11.5 x 26 in,) will keep you cool and comfortable all summer. An...
  • PERFECT FOR SMALL ROOMS - This floor-standing portable AC unit provides steady, fast, effective cooling for rooms up to 150 sq. ft. It’s the ideal...
  • SIMPLE & QUICK TO INSTALL – Just wheel this portable air conditioner into any room with a double hung or sliding window. Attach the included hose...
  • EASY TO USE & CLEAN – The simple remote control & top-mounted LED display with 24-hour timer allow you to precisely control the air temperature. To...
  • 3-in-1 FUNCTIONALITY - Combines 3 energy efficient functions for all of your cooling & ventilation needs with cool, fan, & dehumidifying modes all in...
Bestseller No. 20
DELLA 6000 BTU 115V/60Hz Energy Saving Window Air Conditioner, Whisper Quiet AC Unit with Remote,...
  • THIS ITEM IS NOT FOR SALE IN CALIFORNIA
  • [COOL YOUR SPACE] This 6000 BTU 115V/60Hz window air conditioner is powerful enough to quickly cool rooms up to 250 square feet.
  • [CONVENIENCE DESIGN] This window AC unit includes a remote control and a user-friendly LED control panel. Two ways to adjust temperature more...
  • [QUIET OPERATION] A decible limit enables low volume operation equivalent to a quiet conversation.
  • [COMPACT SIZE] Measuring only 15.98"W x 15.2"D x 12.52"H, it's easy to add this unit to any space.

Having trouble finding a great small quiet air conditioner?

This problem is well understood by us because we have gone through the entire small quiet air conditioner research process ourselves, which is why we have put together a comprehensive list of the best small quiet air conditioners available in the market today.

After hours of searching and using all the models on the market, we have found the best small quiet air conditioner for 2023. See our ranking below!

How Do You Buy The Best Small Quiet Air Conditioner?

Do you get stressed out thinking about shopping for a great small quiet air conditioner? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching small quiet air conditioner, which is why we have assembled a comprehensive list of the greatest small quiet air conditioner available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for small quiet air conditioner that you consider buying. Your questions might include the following:

  • Is it worth buying an small quiet air conditioner?
  • What benefits are there with buying an small quiet air conditioner?
  • What factors deserve consideration when shopping for an effective small quiet air conditioner?
  • Why is it crucial to invest in any small quiet air conditioner, much less the best one?
  • Which small quiet air conditioner are good in the current market?
  • Where can you find information like this about small quiet air conditioner?

We’re convinced that you likely have far more questions than just these regarding small quiet air conditioner, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for small quiet air conditioner, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible small quiet air conditioner. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an small quiet air conditioner buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available small quiet air conditioner currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of small quiet air conditioner has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an small quiet air conditioner?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your small quiet air conditioner.
  5. Customer Ratings: Number ratings grade small quiet air conditioner objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their small quiet air conditioner.
  7. Product Quality: You don’t always get what you pay for with an small quiet air conditioner, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an small quiet air conditioner is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining small quiet air conditioner information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding small quiet air conditioner is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: Which type of air conditioner is the quietest?

A: The Market survey of Industrial Air Preheater offers a comprehensive analysis of diverse features, including production capacities analysis of Industrial Air Preheater, demand, product developments, revenue generation, and Size of Industrial Air Preheater Market across the globe.

Q: How to know which central air conditioner is the quietest?

A: Inspecting the unit. Plugging in the service valve: it is located in the Freon kit: the large connector valve found amongst the kit’s other contents. Plugging in the tap valve: this is the small valve connector in the Freon kit. Adding Freon: all you have to do is to attach the Freon container to the two valves that you have just fixed. …

Q: Who makes the quietest window air conditioner?

A: The most quiet window AC unit on the market is the Midea U Inverter Silent Window Air Conditioner. So there you have it – the very best quiet air conditioners on the market in 2023 and 2023.

Q: What is the most quiet window air conditioner?

A: TOSOT Tranquillity: Quietest 8,000 BTU Window AC Unit. TaoTronics TT-AC003: Very Quiet Window Air Conditioner. Soleus Air Exclusive: Quietest 6,000 Window AC Unit. Haier Serenity: Whisper Quiet Haier Window AC Unit. Keystone KSTAW05BE: Small Quiet 5,000 BTU Window Air Conditioner. Frigidaire FFRE123WAE: Best Quiet 12,000 BTU Frigidaire Window AC Unit.