Top 9 Smallest Window Air Conditioners in 2020

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There are many reasons to buy a small window air conditioner. Perhaps you have a small room to cool and don’t want it “freezing” in there. You might also have a small window and need a mini window air conditioner to fit it.

These are the smallest window air conditioners available in sizes from 5,000 to 12,000 BTU. The reason we included larger sizes is that many homeowners want a small window unit that can deliver 8K to 12K BTUs of cooling power.

Smallest Window Air Conditioners

When most people search for the smallest window unit, they want the small AC for a small bedroom, office or den of up to 150 square feet.

If you’re looking for a larger AC that is still compact, see the table and reviews of small 6,000 to 12,000 BTU models.

This table includes dimensions and weight for the most compact window air conditioners.

      Image                    Product

Frigidaire FFRA0511R1E

  • 12 * 16 inches, 43lbs
  • 41 pounds
  • 5,000 BTUs, 150 square feet
  • 2 cool speeds + 2 Fan Speeds
  • Knob/Mechanical Controls

Editor's Pick

Frigidaire FFRA0511U1

  • 11 7/8 * 16 1/16 inches, 43lbs
  • 44 pounds
  • 5,000 BTUs, 150 square feet
  • 2-speed fan, knob/Mechanical  controls

Frigidaire FFRE0533U1

  • 12 3/4 * 15 3/4 inches, 44lbs
  • 49 pounds
  • 5,000 BTUs, 150 square feet
  • 24H timer, remote
  • Energy Star

hOmeLabs 5,000

  • 12 * 16 inches, 36.5lbs
  • 36.5 pounds
  • 5,000 BTUs, 150 square feet
  • Knob/Mechanical controls

Frigidaire FFRA0611R1 6,000 BTU

  • 13 7/16 * 18 1/2 inches, 44lbs
  • 48 pounds
  • 6,000 BTUs, 200 square feet
  • Digital, auto retart, 2-speed

Koldfront WAC12002WCO 12,000 BTU

  • 14 9/16 * 19 inches, 80lbs
  • 70.8 pounds
  • 12,000 BTUs, 350-450 square feet
  • Energy Star, remote, timer

Koldfront WAC10002WCO 10,000 BTU

  • 14 9/16 * 19 inches, 70lbs
  • 61.1 pounds
  • 10,000 BTUs, 300-400 square feet
  • Energy Star & Energy Saving

Kenmore Smart 04277107

  • 12-3/8 * 19 9/16 inches, 58lbs
  • 58 pounds
  • 10,000 BTUs, 300-400 square feet
  • Wi-fi, app, smart home
  • Energy Star

Small Window Air Conditioner Reviews

Following are reviews of the 9 models in the list including key dimensions, pros, cons and features.

Smallest Window Air Conditioners: 5,000 BTU

#1 Frigidaire FFRA0511R1E

This is a popular Frigidaire model with rotatary mechanical controls. It is light weight, narrow and not very tall, so ideal for small windows.

Mechanical rotary controls allow you to manage the cooling and fan speeds, and are much affordable than their other counterparts.

A 2-way air direction control is included. The unit starts at a low power level which cut both energy usage and your bill. It will restart automatically and operate at its previous settings when power is restored.

  • Height x Width: 12 x 16 inches
  • Window Size: Minimum 12-inch opening and 23 to 36 inches wide.
  • Pros: It is the most value choice. Plus mechanical control remove 1.1 pints moisture per hour. It's much more than its digital version. Plus it is the most value choice.
  • Cons: Basic model, doesn't has features like full remote, programmable timer, Energy Star, etc.

Bottom Line: If you want a durable and basic window ac for a small room at a relatively low price, this is a good choice.

#2 Frigidaire FFRA0511U1

This is one of the shortest window air conditioners and it is light weight too. It is a mechanically-controlled unit, so quite affordable.

The unit removes 1.6 pints of moisture per hour, and drier air feels more comfortable. It has two fan settings plus fan-only mode when you want air circulation or a little white noise for sleeping.

  • Height x Width: 11.9 x 16.2 inches
  • Window Size: Minimum 12-inch opening and 23 to 36 inches wide.
  • Pros: Smaller size fits in small windows. Affordable. Auto restart means it will turn back on and resume cooling when power is restored after an outage.
  • Cons: Knob controls rather than digital.

Bottom Line: If saving money on a durable little window air conditioner that does a great job getting rid of humidity is your goal, you’ll enjoy this one.

#3 Frigidaire FFRE0533U1

The FFRE small window air conditioner differs from the digital FFRA in that it has 3 fan speeds instead of 2 and includes an alert to notify you when the filter needs cleaning. It can also fit windows as narrow as 22 inches.

It is Energy Star rated. That means you’ll reduce energy use, be more environmentally friendly and save on cooling cost too.

This compact Frigidaire window AC comes with a 24-hour time and full-function remote.

  • Height x Width: 12.75 x 15.75
  • Window Size: 22-36 inches with 13 inch minimum vertical opening.
  • Pros: This is one of the narrowest window air conditioners available at less than 16 inches wide. It removes 1.4 pints of moisture per hour, a significant reduction in humidity.
  • Cons: Costs a few bucks more than its sister model, the FFRA0522U1. Still, if you need a small window AC in terms of width, this is narrower.

Bottom Line: If you enjoy a full-featured unit that is very narrow, you’ll be happy with this compact window air conditioner.

#4 HomeLabs 5,000

This small ac fits very narrow windows and is just 12” tall. It is light weight with only 36.5 pounds. The rotary controls are mechanical rather than digital, and it has 7 temperature settings and is rated high for fast cooling times.

An installation kit is included, which has a bracket. That’s a nice features for a window unit this small. Window seal foam and extendable side covers complete the kit.

The HomeLabs 5,000 is also on our list of the Quietest Window Air Conditioners, so it’s perfect for a bedroom.  It has an 11.1 EER energy efficiency ratio, which isn’t quite to Energy Star level, but close.

  • Height x Width: 12 x 16 inches
  • Window Size: Minimum 13 inches high and 23 to 36 inches wide.
  • Pros: An affordable 5,000 BTU window AC that’s very quiet too.
  • Cons: Mechanical controls reduce cost, but they don’t provide quite as precise cooling as digital controls.

Bottom Line: If you want a low-cost, high-cool unit that’s among the smallest window ACs, this one will do the job.

#5 Kapsul Air W5

This unit is not available at this writing, though it is scheduled to be released shortly. However, the Kapsul W5 has been delayed repeatedly, so we’ll believe it when we see it. The W5 is available for pre-order.

If it makes it to market, the Kapsul Air W5 will be the smallest window air conditioner available. At just 7 inches tall, it won’t obscure the view of keep out natural light as larger ACs do.

This is a smart AC. Kapsul Air has announced it will integrate with Alexa and Google Assistant via wi-fi.

  • Height x Width: 7.3 x 20 inches
  • Window Size: An 8-inch vertical opening minimum, for windows from 23-36 inches wide.
  • Pros: Small, wi-fi and smart home connectivity.
  • Cons: Costlier than most small window ACs. Still not available.

Bottom Line: When released, it will truly be a mini window air conditioner. If you’re willing to pay more for good looks and the technology, you might like the W5.

Smallest Window Air Conditioners: 6,000-12,000 BTU

If you have more than 150 square feet to cool but need a compact window AC, these next three are top choices. There are 6K, 8K, 10K and 12K BTU models.

#6 Frigidaire FFRA0611R1 6,000 BTU

This series keeps making the list because it is one of the smallest window AC lines available.

This is the 6,000 BTU model in the series. It cools 150-200 square feet. The controls are mechanical, which keeps cost down but doesn’t allow for performance features like a timer or remote control.

  • Height x Width: 13.5 x 18.5 inches
  • Window Size: Minimum vertical opening of 15 inches and windows 23-36 inches wide.
  • Pros: Affordable, very durable, compact size.
  • Cons: No remote or timer. No thermostat, just cooling settings from Low to High.

Bottom Line: If you’re looking for a mini window air conditioner that delivers reliable cooling at a competitive cost, this is a top choice.

#7 Koldfront WAC12002WCO 12,000 BTU

Frigidaire makes many of the smallest units in the 6K to 8K range, but Koldfront excels in the 10K and up range. This is one of the narrowest window air conditioners in this BTU capacity at just 19 inches. It has the same cabinet size as the 10K unit.

This is an energy-saving compact window unit – Energy Star certified with Energy Saver mode and 24-hour timer. LED lighting.

  • Height x Width: 14.6 x 19 inches.
  • Window Size: Minimum window height is 15.5 inches. The unit fits windows 23-36 inches wide.
  • Pros: Narrow, Energy Star, 24H timer, remote, 4-way airflow, 3 fan speeds.
  • Cons: All these features and Energy Star efficiency come at a little higher price.

Bottom Line: Pay a bit more and get a lot more with this Koldfront compact 12,000 BTU air conditioner.

#8 Koldfront WAC10002WCO 10,000 BTU

This compact Koldfront is the smallest 10,000 BTU window air conditioner on our list.

It is fully digital and offers precise climate control with 3 fan speeds and good dehumidification. This is a compact, Energy Star compliant window air conditioner.

  • Height x Width: 14.6 x 21.4 inches.
  • Window Size: Minimum height is 15.5 inches. It fits windows 23-36 inches wide.
  • Pros: Full featured, quiet and not very big. Very energy efficient with energy-saving Sleep Mode and Energy Saver mode.
  • Cons: A bit heavy at 70lbs, but not overweight for the 10K BTU output.

Bottom Line: If you’re committed to reducing your energy use, this is the top model in its class. You’ll cut energy costs and reduce carbon emissions with this compact Koldfront 10,000 BTU window AC.

#9 Kenmore Smart 04277107 10,000 BTU

This series keeps making the list because it is one of the smallest window AC lines available.

This is the 10,000 BTU model in the series. It cools 300-400 square feet. The controls are mechanical, which keeps cost down but doesn’t allow for performance features like a timer or remote control.

  • Height x Width: 15 inches x 23.6 inches
  • Window Size: 27-39 inches with minimum height of 16 inches.
  • Pros: Compact, smart and Energy Star rated. It offers the most popular convenience features – Remote, wi-fi, app and smart devices.
  • Cons: There’s a slight upcharge for the advanced technology.

Bottom Line: If you’re willing to pay a higher price for a smart, hardworking window unit, this Kenmore compact window air conditioner is worth considering. If you like it and need more window units, this series features five models from 8K to 18K BTUs for cooling up to 1,000 square feet. Now 10K, 12K, 18K are available on Amazon.

Proper Window Sizing is Essential

Some consumers choose the smallest window air conditioner they can find only to be disappointed in its performance.

It’s important that the AC be properly sized for the space.

Problems with an Undersized Window AC

It’s not a mystery. If the unit is too small for the room, you will have three problems.

1. It won’t have the cooling power to remove enough heat. You’ll be uncomfortably warm.

2. Window ACs remove humidity too. If the unit is too small, the room will remain muggy.

3. The AC will run way more than it should trying to keep up, and this will be loud and lead to early mechanical failure.

That all adds up to wasted money.

If small windows are a problem, but the room is large, there’s a solution.

Ductless mini split air conditioners are designed for rooms not served by central air conditioning and where a window AC won’t do the job.

See our complete Guide to Central Air Conditioning vs. Ductless AC/Mini Split AC.

Back to window air conditioners, the chart below was developed by the Energy Star agency.

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


It’s a good basic guide. However, when rooms are cooler or hotter due to the house layout and other factors, size should be adjusted.

Energy Star advises adjusting for room features:

  • For heavily shaded parts of your home, reduce AC capacity by 10%
  • For sunny parts of your home, increase AC capacity by 10%
  • Add 600 BTUs for each additional person that typically occupies the room
  • Add 4,000 BTUs of capacity if AC will cool a kitchen

Let’s say you have a 12x18 bedroom, so 216 square feet.

That falls between a 6,000 and an 8,000 BTU model, since very few 7,000 BTU models are made.

If one person uses the bedroom and it is on the north side or in a shaded part of the house, then a 6K unit would be sufficient.

If two people sleep there, the room is upstairs and gets a lot of sun, then you would 1) add 600 BTU and 2) add 10% or about 700 BTU. The total would be 7,000 + 600 + 700 = 8,300 BTUs. The 8K BTU model would be the right choice.

Choosing the Best Small Window Air Conditioner

The best AC is the one that fits your needs like a glove.

We discussed sizing a window AC already.

Here are a few more buying tips. Decide using these points:

How much the window air conditioner gets used: If you occasionally need to turn it on, then a unit that isn’t very efficient can save you money on equipment. See the tables above for units that do not meet Energy Star efficiency such as the HomeLabs 5,000 and the Frigidaire FFRA0611R1.

If you need to use the AC often, then it makes sense to pay a bit more for an Energy Star model from the list that is the right size for your space.

As you can see, there are Energy Star models at 5K, 8K, 10K and 12K BTUs. That covers rooms from about 150 to 450 square feet.

How important features are to you: If you turn the AC on when you want it and turn it off when you leave, then a simple mechanically controlled window unit will be fine. They’re low-tech and affordable. The disadvantage will be having to wait for the space to cool off.

When you think you’d use a 24-hour timer to program when the unit runs and would like a remote, then consider paying for one of the digital window units on the smallest window AC list. When used properly, you can cut energy use and cost and still enjoy cool air when you arrive home or enter the room.

PS: Portable ac units and Evaporative cooler are more and more popular for cooling small rooms in mild climate. You can also check our Best Evaporative Cooler Reviews and Small Portable ACs for more info.

If you don’t find the information here that you’re looking for, then it will likely be available in our other in-depth Window AC Reviews:

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