Smallest Window Air Conditioner on the Market [2021 Small AC units Buying Guide & Review]

Do you live in areas where you have hot and humid days? Would you like to keep the rooms you live in cool all day and night? Could it be that your central system is not cooling some of the rooms?  Or you do not even want to turn on the central system? Then you need the Smallest Window Air Conditioner on the market to get those small spaces comfortably cool.

In this small window air conditioner units guide;

Compact  AC unit for  window comparison guide

The tiny window AC on the market buying guide

Best & smallest window air conditioner on the market review

1.Frigidaire FFRE0533S1 5,000 BTU 115V

2.    hOme 5000 BTU

3.   Frigidaire FFRA0511R1 5, 000 BTU 115V

4.   LG LW6017R 6,000 BTU 115V

5.   Frigidaire FFRE0833S1 8,000 BTU 115V

Tips and precautions when operating your mini window AC unit

Final thoughts on the best & mini compact window air conditioner on the market

Compact window air conditioner on the market comparison guide

Click for pricingCooling Capacity (BTUs)Room size (Square feet)AC size  
hOme 5000 BTU 500015016W,15.4D,12H
Frigidaire FFRA0511R1 500015016W,15.25D,12H
LG LW6017R 600026017 5/16W, 14 3/8D, 11 1/8H
Frigidaire FFRE0533S1 500015015.25"W, 13"D,12H
Frigidaire FFRE0833S1800035018.5 W, 17.5D, 13.4" H

 Small window unit air conditioner buying guide

So, what should you consider when choosing the best & smallest window air conditioner?

1. The air conditioning unit BTU

The BTU (British Thermal Units) is a basic measure of thermal energy and determines the capacity of your small window air conditioner unit. The more the BTU, the bigger the AC unit size and weight.

2. Your room size vs the AC unit BTU

Calculate the room size in square feet. Multiply the length and width to get the square footage. To determine the BTUs needed to optimally cool your room.

The following table is a guide  on the room size vs the  BTUs. Also consider the other factors listed below the table to objectively determine the BTU requirement.

Area To Be Cooled (Sq. Ft.) Capacity Needed (BTUs Per Hour)
100 to 150 sq. ft. 5,000 BTUs
150 to 250 sq. ft. 6,000 BTUs
250 to 300 sq. ft. 7,000 BTUs
300 to 350 sq. ft. 8,000 BTUs
350 to 400 sq. ft. 9,000 BTUs
400 to 450 sq. ft. 10,000 BTUs
450 to 550 sq. ft. 12,000 BTUs
550 to 700 sq. ft. 14,000 BTUs
700 to 1,000 sq. ft. 18,000 BTUs
1,000 to 1,200 sq. ft. 21,000 BTUs
1,200 to 1,400 sq. ft. 23,000 BTUs

Apart from the room square footage, adjust the BTU capacity  of your mini AC  window unit as under;

  • Increase the BTU if the ceiling height is more than the normal 8 feet
  • Are you more than 2 people in the room? For every additional person, increase by 600 BTUs.
  • If the air  conditioner for  small  window  opening is being installed in the kitchen, increase  the BTU capacity by 4000
  • If your room enjoys more sunlight, increase the BTU by 10%

3. The environment the AC will operate in

Some of the factors to take into consideration include the amount of sunlight and thus heat your room  receives. This will be determined by the number of windows and the direction they face.

North facing windows are in shade whereas western facing windows receive most sunlight.

Whether your room exterior has a shade or not also determines the amount of heat received. Keeping the exterior of the room you are cooling shaded will help the mini window air conditioner  unit to keep you cool.

However,  make sure that airflow around the exterior of the unit is not restricted by trees, shrubs or other obstructions.

4. Your electrical power specifications

Know your specifications and ensure that your choice small window AC unit plug is compatible with your outlet. Also confirm that the circuit can handle the additional power requirement to prevent circuit breaks.

5. The Energy Efficiency

Be on the look-out for energy star rating and /or energy efficiency ratio of your  smallest window air conditioner on the market. The higher the EER, the more efficient the Window AC unit. The Air Con units with an energy star rating may use 10% less energy.

6. Filter

Ensure that the small window AC unit filter can easily be accessed, removed, cleaned and reassembled.

7. Window location

You are likely to get a better performance if your window is centrally located on the wall.

8. Noise

Some are relatively quiet, others are loud especially when set on high. Depending on whether you are a light sleeper, the noise may be a lullaby or a distraction.  A noisy small window opening AC unit may also be a distraction in an office.

9. Warranty

How long is the warranty of the mini compact window air conditioner unit? The longer the warranty, the better.

10. Additional features

Be on the look-out for these features that improve efficiency or make it more convenient to operate your Best & smallest window air conditioner on the market.

  • What is the dehumidification capability per hour?
  • Timers that allow you to set the time the small window AC unit can be operation e.g. just before you get home to when you are asleep
  • Easy to use controls that may be mechanical or electronic. Electronic controls allow more flexibility.
  • Does the small window air conditioning  unit have a remote control that allows you to control settings from anywhere in the room?
  • A sleep mode where the AC unit increases the temperature gradually as the room occupant is sleeping. This subsequently reducing pressure on the compressor and the noise in the room.
  • Be on the look-out for a filter alert that signals the need for cleaning.
  • Does the small air  conditioning  for window have an electronic ionizer assist the AC to more efficiently remove impurities from the air?
  • What are the venting options? Is it to recirculate room air, pull in air from outside or exhaust room air outside?
  • Observe the length of the power cord. The longer, the better.

The small window AC units on the market reviews

1. Frigidaire FFRE0533S1 5,000 BTU 115V: Smallest AC unit  for  window on the market with Full Function Remote Control

Best & smallest window air conditioner on the market...Frigidaire FFRE0533S1

Small  window air conditioner unit size

This mini window AC  unit has  a 12″cabinet Height, cabinet Depth (w/ front) 15-1/4″ and cabinet Depth: 13″

Window size

The Window measurement should be  width 23″ – 36″ and height 13″.

Room size

The 5000BTU unit keeps your up to150 square feet room cool and nice.


This light small window AC unit is easy to install with and comes with expandable side panels. It comes with the window mounting kit.

Cooling performance

This unit quickly and efficiently cools your room quickly. You can control the fan from three settings. Make use of the digital controls to set the desired coolness. You can direct airflow to desired target.


The  tiny window air conditioner unit dehumidifies up to 1.1 pints per hour


Frigidaire FFRE0533S1  has safety certifications from UL/CUL (SA11087), ENERGY STAR and is UL Listed.

Energy Efficiency

The smallest  size window AC unit has a 2016 energy star and a 12.2 energy efficiency Ratio (EER).

The Low power start-up and operation will  conserves energy as well as save money.

The Timer allows you to set up when you want the conditioner off and on. You may time the mini AC unit to switch on just before bedtime and off when asleep.


You get a 1 year full warranty/5 Year Sealed System.

With the Timer, you can set the desired cooling duration.

The Remote control is a great plus for convenience


  • The  tiny unit window air conditioner  is easy to install
  • Relatively quiet
  • Small and light to easily store as it takes little space
  • Multidirectional vent direction


  • Though relatively quiet, some light sleepers find the noise distracting their sleep.

pointing finger 1 Best Air Conditioners

Want to know if this mini compact window AC fits within your budget?

>>Click here to Check user reviews and price on Amazon <<<


2. hOme 5000 BTU: Mini AC unit for Window with  lifetime technical support

Best & smallest window air conditioner on the market...hOme 5000BTU


Mini AC unit size

This small window air conditioner unit measures 16” width, 12” height and 15.4”depth.

Window size

This best window air conditioner on the market ideally fits in windows whose width is between 23” – 36” and 13” minimum height.

 Room size

Up to 150 square feet


This 5000 BTU window AC unit is light and easy to install. It requires a 110V/120V, 460 watts and 3 prong power outlet. You get a user guide to help you install this small window air conditioning unit.

For easy installation, the package contains a support bracket, filter, window seal foam and side panel leaf covers.

Cooling performance

This air conditioner cools your space in 10 MINUTES or less. To control the temperatures as desired, AC unit comes with 7 speeds, adjustable fan settings and two-way (side to side) airflow. The digital controls are easy to use.

This smallest  size  window  AC unit comes with a filter that can be warm water and dish soap washed. However, make sure the filter is completely dry before re-installation. Alternatively, vacuum clean the filter. It is recommended that you clean the filter every 2 weeks.

Energy efficiency

hOme 5000 BTU Window Mounted Air Conditioner has 11.1 EER energy efficiency.


You get a 30 day no questions asked money back guarantee.

And a 2 year warranty plus six months extra when you register the mini AC unit.

You also get lifetime technical support.


  • Great power from a small AC
  • Well-built sturdy unit
  • Small unobtrusive size
  • The reusable filter is easily cleaned
  • 2 year warranty and lifetime technical support


  • Vent direction not multi directional

pointing finger 1 Best Air Conditioners

Want to know if this window air conditioner fits within your budget?

>Click here to Check user reviews and price on Amazon<<<


3. Frigidaire FFRA0511R1 5, 000 BTU 115V: mini  compact Window Air Conditioner on the market with Mechanical Controls

best & smallest window air conditioner on the market...Frigidaire FFRA0511R1

Smallest air  conditioning unit size

This compact window AC unit measures 16 inches width,15-1/4 inches deep and 12 inches height.

Window size

You can fit this mini window air conditioning unit on a Window Height: 13″ and width 23″ – 36″

Room size

Up to 150 square feet


It is easy to install the unit. The package comes with a window mounting kit to install this 5,000 BTU mini-compact AC unit. The air conditioner uses the standard 115 V power outlet.

You also get pleated quick side panels that you can extend to fit your window size. The extra-long cord (6′ (6-1/2′) makes it unnecessary to use an extension cord.


Make use of the easy to use mechanical rotary controls to adjust the 2 cooling speeds and the 2 fan speeds. The air direction is   2-way.   With The Effortless™ Temperature Control, you set the temperature desired in the room.

When you switch off the AC unit, the built in Effortless™ Restart will ensure the best window air conditioner unit resumes operation at its previous settings the next time you switch it on.

You also get the room dehumidified up to 1.1 pints per hour.

Energy efficiency

Frigidaire FFRA0511R1 is a low power start-up AC with an Energy Efficiency Ratio (EER) of 11.1.

Added benefits

You get to enjoy a healthier and cleaner air as the window aircon unit has a built in, slide out  Effortless™ Clean Filter that filters air borne particles, odors and bacteria.

The warranty is 1 year / 5 year sealed system.

Quiet operation and effortless restart.


This small window air con unit has a UL/CUL (SA11087) Safety Certification .


  • Light, easy to install and remove the small window air conditioner unit for storage
  • Mechanical controls easy to use
  • As some users put it, “it packs a punch for such a little thing”
  • The Effortless™ Temperature Control keeps room at coolness /warmth levels


  • While it’s relatively quiet, some people still find the noise irritating. All the same, you will  get used to the rhythm.
  • No remote control

pointing finger 1 Best Air Conditioners

Want to know if this tiny window air conditioner fits within your budget?

>Click here to read user reviews and check price on Amazon<<<


4. LG LW6017R 6,000 BTU 115V: Smallest Air Conditioning unit on the market with a filter change indicator

 Best & smallest window air conditioner on the market...LG LW6017R 6,000 BTU

Room size

Up to 260 square feet

compact air conditioner unit size

The window AC unit measure Width-17 5/16″, Depth-14 3/8″ and Height-11 1/8″.


It is easy to install. Extend the side panels to fit into your window size


This 6,000 BTU air conditioning unit cools your 260 sq. ft. room and dehumidifies up to 1.8 pints per hour.  For added advantage, the cold air is blown upwards and quickly circulated by the ceiling fan. You can set your desired temperatures via the 3 cooling speeds and 3 fan speeds. You also set the auto cool setting for cooling flexibility.

On cool mode, the window air con unit switches to fan when desired temperature is reached. The energy saving mode shuts off both cool air and fan when the desired temperature is reached and auto restarts when the temperature rises.

Should the unit be turned off, the small AC unit has an Auto restart built in.

With this unit, you get a 2 –way direction flow.

Energy efficiency

This small AC unit is an energy saver thus saving you money. The Energy Efficiency Ratio is CEER 11.3.

Additional features

You get a 24-hour on and off timer for your convenience as well as helping you save on energy.

The remote is a plus when you choose this smallest in window air conditioner unit.

There is a 1 year limited warranty on parts and labor.

A reusable filter located on the front is an added advantage and the unit has a filter change indicator..


  • Efficient cooling performance
  • Easy to use
  • Quality
  • Can easily run off generator
  • Relatively quiet


  • Digital display location is not easily visible depending on how high the small window AC unit is installed

pointing finger 1 Best Air Conditioners

Want to know if this smallest window unit air conditioner fits within your budget?

>Click here to Check user reviews and price on Amazon<<<


5. Frigidaire FFRE0833S1 8,000 BTU 115V: Small Window AC unit on the market with Temperature Sensing Remote Control

Best & smallest window air conditioner on the market...Frigidaire FFRE0833S1

Small window air conditioner unit size

The window AC unit measures 13-7/16″ Height, 18-1/2″ Width and 17-1/2″ depth.

Window size

This room air conditioner serves a window height (min) of 14″, and width (min/max) of 23″/36″.

Room size

Up to 350 square foot


Connected to a standard 115V electric power outlet, this 8000 BTU air conditioner is easily mounted on a window.

Cooling performance

Frigidaire FFRE0833S1 quickly cools a room up to 350 sq. ft. and dehumidifies up to 1.7 pints per hour. Furthermore, the Ready-select electronic control allows you to decide on the desired temperatures.

You also get to choose from 3 cooling speeds, 3 fan speeds, Auto Cool mode, Energy Saver mode and Sleep Mode.

Moreover, with the Effortless temperature sensing remote control, you observe, set and maintain the desired room temperature from anywhere in the room.

With the 8-way air direction, you get to control where the cool air is directed .

Energy Efficiency

2016 energy star

Energy Efficiency Ratio of 12

Set this air  conditioner for a small window opening on the energy saving mode and save on electricity bills.

Also note that this best window AC unit on the market can start on low power and thus conserves energy.

Additional features

Use the Effortless temperature sensing remote control that has separate buttons and adjust the room temperature /fan speed as desired temp.

Do you suffer from allergies? The Clean air ionizer in the small window air conditioner unit is a major plus as it eliminates pollen and other impurities from the air.

You set the time you want to have this mini AC unit on/ off using the 24-hour on/off timer.

And, you get a 1 year full warranty / 5 year sealed system.


Frigidaire FFRE0833S1 8,000 BTU has a UL/CUL (SA11087) Safety Certification, is UL listed and ENERGY STAR® Certified.


  • Efficiently cools and lowers humidity
  • Temperature sensing remote reads the actual room reading
  • 24 hour on/ off timer
  • Clean air ionizer a great plus for allergy sufferers
  • 8 way airflow flexibility


  • The high fan setting may be too noisy for some people

pointing finger 1 Best Air Conditioners

Want to know if this best  air   conditioner unit for  window fits within your budget?

Click here to Check user reviews and price on Amazon<<<


6. Keystone 5000 BTU : The small quiet window air conditioner with “Follow Me” LCD remote control.

small window air conditioner... Keystone 5000BTU

small window air conditioner… Keystone 5000BTU

Small window air conditioner unit size

This mini AC unit for small window measures 12″ Height, 16″ Width and 15.4″ depth.

Room size

Up to 150 square foot


The smallest  size  window  AC unit comes with the retracting side panels, foam insulation, and screws. With  some  assistance  from a  second  person to  lift this compact  AC,  you  will easily mount  it on  your window.  You then connect to a standard 115V electric power outlet, set the desired temperature and you  are good  to go.

 Cooling performance


The Keystone 5,000 BTU AC unit cools a room up to 150 square units with up to 1.3 pints per hour dehumidification.

You easily see, set and control the temperatures you desire using the electronic controls with LED display.   You  can also  set  to  energy  saver  mode,  or  even sleep  mode  to  for  more  efficiency  and  thus  save  money. Moreover, easy selection of the various settings is easily done with the touch of a button.

Furthermore, the mini window air conditioning unit comes with a “Follow Me” temperature sensing LCD remote control allowing you to control the temperature from across the room.

Additionally, the auto-restart saves your settings when power is restored to the unit

 Energy efficiency

The mini AC unit  has  an  energy  efficiency  ratio of  11.2

Additional features

 The Keystone 5000 window air conditioner comes with a programmable 24-hour timer. To ensure a good night’s sleep, this AC is quiet (49 dBA on low).

Moreover, you get a 1 year full warranty / 2-5 year limited warranty (sealed system)


  • quickly and efficiently cools and lowers humidity
  • Temperature sensing “follow me” remote  that  reads  the  temperature from  wherever  you are in  the  room
  • programmable timer
  • Quiet operation thus  great  for  bedrooms
  • Worth the  money


  • For some users,  it  may be loud on  high  setting

pointing finger 1 Best Air Conditioners

Want to know if this window  mounted mini  compact air   conditioner fits within your budget?

Click here to Check user reviews and price on Amazon<<<


Tips and precautions when operating your smallest air conditioning unit on the market

Immediately inspect the small window AC unit upon receipt

You better inspect for damages, defects or missing parts. This allows you to take advantage of the seller’s / manufacturer return policy.

Make the right choice of window

The direction of cold air flow will depend on window location. However, ensure that the cold air is directed to the center of the room for uniform conditioning.


  1. To prevent cutting your fingers on the back vent, get a good pair of leather gloves to wear when unpacking and moving the air conditioning unit.
  2. Make sure that the source of power is adequate for chosen small window AC unit
  3. Follow manufacturer’s instructions to make sure that the unit is correctly installed secured
  4. Where the window size is bigger than the manufacturer’s recommendation, some users have used construction Styrofoam / thick insulating foam board to fill in the gaps.
  5. Do not share the power outlet usage
  6. Save the carton for storage during winter
  7. Should you notice window vibration, the smallest AC unit is not properly installed
  8. If you notice water dripping in the room, the window Air Con unit needs to be tilted slightly to the outside to redirect water drain. Furthermore, if the window air conditioner is not properly tilted, stagnant water may build up in the air conditioning unit and that a perfect environment to grow mold


  1. Only operate when the window aircon unit side protective cover  is in place.
  2. Not to be operated in a wet room such as bathroom or laundry
  3. When the min AC unit is in operation, keep the window closed otherwise you may find the indoor wet
  4. To save on cost, maintain the set cooling mode and increase fan speed to get a feel of cooler air.
  5. Properly ventilate the room while the unit is in operation especially when the stove is also in use.
  6. Ensure that no obstacles are found around air inlets and outlets
  7. Some users indicate that a ceiling fan assists to distribute cold air from the small window air conditioning units to keep rooms that are a little bigger than manufacturer recommendations cool.
  8. Do not direct airflow to pets or indoor plants
  9. Take care of the power cord and do not place it near flammable substances or place heavy objects on it. In case of damage, replace with the one recommended by the manufacturer
  10. To defrost cold coil run the fan mode for a while
  11. The water draining from the small window air conditioner unit is contaminated and not fit for consumption
  12. Operate the other heat producing machines during the cool hours


Make sure you have properly grounded the small window AC unit.

Keep inspecting the external bracket to ensure that your best & smallest window air conditioner on the market is in good order to prevent the air conditioning unit from falling.


Make sure you have switched off power and circuit breaker.  Do not use water as it may leak into the window aircon unit and degrade insulation. In case water leaks in, switch off and contact your technician.

Follow manufacture instruction on filter cleaning. Cleaning of filters is necessary as trapped particles may build up causing accumulation of frost on cooling coils.

Dust the unit with an oil free cloth or one that is dampened in a water and mild detergent solution. Wring out any excess water to prevent water leaking into the window air con unit. Also avoid using harsh cleaners wax or polish.


To prevent fires, avoid using extension cables and should the small window AC unit have a heater, place it 2 feet away from combustible materials.

Cover gaps above or beside the miniature window air conditioning unit to prevent break in.

Should you concerned about the security of the small window Air Conditioner unit, screw it on the window.

Also avoid using gasoline or other flammable substance near the air conditioner


For best effect, keep the rooms well insulated. You may use insulation plastic on windows.

On those days the temperature is 90 F. or higher, minimize the amount of direct sunlight coming through the windows. Close the window treatments such as blinds or curtains.

Keep the external areas surrounding the window AC unit clear of bushes or other items that may interfere with the AC unit.


Follow removal instruction and put the mini AC unit back to the original carton or cover with plastic.

Final thoughts on the mini AC unit on the market

You may have no control of the temperature outside your room. However, from the above listed AC units, you can choose the best & smallest window air conditioner on the market to suit your needs and pocket.

Have a comfortably cool day and night!

Could you be on the look-out for the best humidifier for sinus problems, allergies or asthma? Click here

Is your window vertical, narrow, casement or sliding? Click here…

Do you need more details on the size of air conditioner you need? click here

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Are  you searching  for  a camping  tent AC? Click  here

Vicky Geem

Hi there, I'm Vicky!- an ardent reader, researcher and writer. And I love breathing in cool, clean, healthy air. No wonder the interest in information and products that cool, heat, moisturize or purify the air in our living spaces. At, I share this information with you in a way that helps you make better and wiser decisions. When I’m not reading, researching or writing, you are most likely to find me enjoying the cleaner air outdoors. Or minding what I eat as I tend to my kitchen garden, picking some and ... meet you in the kitchen! Or contact me on email  or facebook/vickygeem

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