What Are The Dimensions of a Window Air Conditioner?

You never know how valuable an HVAC unit is until it is summer and you have excess heat in the room.

Air conditioning units are the best systems for cooling hot air in a room and feature some elegant engineering to operate. They come in different sizes and types and can fit any room. The window air conditioner system is one of the most heavily used because of its efficiency and cooling capacity.

They are easy to install, and you can see them hanging out windows throughout the neighborhood. However, today we will not discuss the cooling output and energy consumption. Instead, we will go through the dimensions to help you pick the best AC size.

By understanding the accurate dimensions of an air conditioning unit, you will find the perfect fit for your home. So, without further ado, let us dive right into the details.

Standard Window Air Conditioner Sizes

Window air conditioners come in different sizes, so it is possible to pick one based on the size of the room and window. The sizes could be small, medium, or big, but the British thermal unit (BTU) matters. The BTU rates the amount of heat the A/C can remove from a room. Therefore, an air conditioner can be small-sized but still have a higher BUT.

The standard window air conditioner is rectangular, and the dimensions are characterized by width/length, depth, and height. The standard measurements for window air conditioners are as follows;

  • Width/length: 20 inches
  • Depth: 18 inches
  • Height: 14 inches

Why do You Need to Know The Size of a Window Air Conditioner?

If you care about health and well-being, the amount of power you will use on air conditioning does not matter. However, for the system to effectively maintain room temperatures at desired levels, it is crucial to consider the dimensions.

The dimensions of a window air conditioner are critical for a small room because bigger ACs in small looks spoil the look by their bulkiness. In addition, without considering the appropriate dimensions, the installation could have difficulties. The system would be too big or too small to fit the window space.

Influence of Size on the Air Conditioner’s Work

Each window air conditioner model has its specific technical and operational characteristics. When selecting a device, the dimensions of the indoor and outdoor units of the system must be considered.

The entire performance depends on how much the conditioner protrudes outwards and inwards. The bigger the air conditioner, the bigger these parameters will be.

The dimensions also determine the parts already installed. For example, a bigger window air conditioner will have a bigger condenser, evaporator, and compressor. This translates to a bigger air mass that can be outputted immediately.

Window air conditioners that are compact have low power. However, bigger air conditioners have more power even with smaller fans.

How to Size a Window Air Conditioner Unit

Sizing a window air conditioner unit involves measuring the Length, Width, and Height in inches. However, some brands might give the measurements as millimeters (MM) or centimeters (CM).

Dimensions of 1 Ton Window Air Conditioners

A 1-ton window AC is 12,000 BTU and is the most popular unit size. These units are not suitable for narrow window frames considering their sizes.

On average, a 1-ton window air conditioner is 36 inches long, 23 inches wide, and 14 inches high. (36 x 23 x 14). For standard installation of 1-ton window ACs, the window should be at least 24-inches wide, 36 inches long, and 16 inches high.

Examples of 1 Ton Window AC:

AC UnitAC Width (inches)AC Length (inches)AC Height (inches)
LG LW1216ER2223.515
Voltas 23 Lyi/123 LZF           2223.615
MIDEA MAW12R1BWT           233614
Carrier CAW12ET3N8F0           25.930.516.9
Amana AMAP121BW           19.821.514.7
BLACK+DECKER BD12WT6        1921.514.6
Emerson Quiet Kool           15.215.912.5

Dimensions of a 1.5-Ton Window Air Conditioner

A 1.5-ton or 18,000 BTU window air conditioner is another popular choice for home installations. These units require wider windows considering the limitations of installation kids. On average, they are 27 inches wide, 42 inches long, and 19 inches high.

Examples of 1.5-Ton Window Air Conditioners:

AC UnitWidth (inches)Length (inches)Height (inches)
LG LW1817IVSM           24.5726.2217.72
LG LW1821HRSM           25.5030.5016.84
Voltas 183 DZA/ 183 DZA   25.927.716.9
Hitachi RAW518KUDZ1           25.929.716.9
Blue Star 5W18GBT           25.929.716.9
KEYSTONE KSTHW18A           23.625.417.9

Dimensions of a 2-Ton Window Air Conditioner

2-Ton window air conditioners are the biggest, considering they have between 24,000 and 25,000 BTU. These huge ACs are only used in rooms over 1,500 square feet. On average, the dimensions are (26.5 x 26.5 x 18.6) inches. They also need bigger windows, between 28 and 44 inches long.

Examples of 2-Ton Window Air Conditioners:

AC UnitWidth (inches)Length (inches)Height (inches)
LG JW-Q24WUZA25.926.217.7
Hitachi Summer QC RAV222HUD 2 Ton25.931.616.9
Hitachi RAW222KVD 2 Ton25.930.117.5
Carrier Estrella Neo CAW24EN3R39F026.53118.6
Blue Star 2W24GA 2 Ton 2 Star25.926.517.7
O General AXGT24FHTC 2 Ton2630.118.6

Biggest Window Air Conditioners Available

The biggest window air conditioners have cooling capacities of over 15,000 BUT up to 25,000 BUT.


The FRIGIDAIRE FFRE253WAE is the biggest window air conditioner for bigger rooms. It can generate up to 25,000 BTU of cooling. It can call up to 1,600 square feet. It is 26.5 inches long x 25.6 inches wide x 18.6 inches high. However, the huge size does not affect efficiency because it only needs 2430W of electricity. Typically, it is a 2-Ton window AC.

2. Koldfront WAC25001W

The Koldfront WAC25001W is another popular 25,000 BTU window air conditioner with the highest rating for window ACs in the market. Its standard dimensions are 26.5” x 26.5” x 18.63” and weighs 136.5 lbs. It runs on a higher energy output of up to 2660W. This gigantic 2-ton window air conditioner is perfect for spaces up to 1,500 square feet gigantic 2-ton window air conditioner is perfect for spaces up to 1,500 square feet.

3. LG LW2516ER

The LG LW2516ER is the biggest window air conditioner from the LG brand. It can generate up to 24,500 BTU of cooling output. It is 26 inches wide, 28.13 inches long, and 17.7 inches high (26 x 28.13 x 17.7). It weighs 136 pounds and requires 2370W of electrical output. Despite the size, it is energy efficient. It covers 1,560 sq. ft. per minute, which is great for larger spaces.


AMANA AMAP242BW is among the biggest 2-ton window air conditioner and the best. It is even rated the highest efficiency and can cover over 1,500 sq. ft. per minute, which is better for bigger rooms. Moreover, by generating 24,000 BTU of cooling, only requires 2,300W electrical output. Its dimensions are 26.42 inches x 26.85 inches x 18.74 inches.

5. Whirlpool 22,000 BTU

The Whirlpool 22,000 BTU is a 2-ton window air conditioner that can cool up to 1,400 square feet at a time. It is 26.4 inches long, 26.9 inches wide, and 18.7 inches high. It weighs 123.5 pounds, which is lightweight compared to the other materials.

6. Keystone 25,000 BTU

The Keystone is another humongous air conditioner that can deliver up to 25,000 BTU of cooling. They are easy to window-mount with dehumidification capabilities. It can cool up to 1,500 sq. ft. at a time which is great for spacious rooms. It is 26.5 inches long, 26.5 inches wide and 18.6 inches high (26.5” x 26.5” x 18.6”). It is roughly 102.3 pounds hence not o strains on your window or wall.

Smallest Window Air Conditioners Available

A window air conditioner can only be considered small if it has a cooling capacity of 5,000-10,000 BTU. They can be from 13 to 15 inches wide.


The FRIGIDAIRE 5,000 BUT is the smallest window air conditioner by manufacturer Frigidaire. It is best suited for small spaces and can cool up to 150 square feet at a time. It is 16 inches long, 15.25 inches wide, and 12 inches high (16 x 15.25 x 12). It also weighs 35.27 pounds making it more lightweight

2. FRIGIDAIRE Energy Star 6,000 BTU

This is another mini-window air conditioner from Frigidaire and is very energy efficient. It can cool up to 25- square feet at a go, boasting 6,000 BTU. It is 16 inches long, 13.19 inches wide, and 12.06 inches high (16 x 13.19 x 12.06). It weighs roughly 41.9 pounds making it the perfect mini-window air conditioner.

3. Midea U Inverter Window Air Conditioner

The Midea U window air conditioner is a great energy saver with up to 35% efficiency. This 8,000 BTU U-shaped smart inverter window air conditioner can cool up to 202.96 cubic feet per minute. It is 21.97 inches long, 19.17 inches wide, and 13.46 inches high. It weighs 55.56 pounds and is heavier than average mini-window air conditioners.

4. Haier ESAQ406T Serenity Series 6,000 BTU

The Haier 22’ Serenity Series AC unit has around 6,000 BTU of cooling power for spaces reaching 250 square feet. It is a narrow window air conditioner that offers flexible cooling. Its dimensions are 18.3 inches x 21.25 inches x 12.44 inches. It weighs 55.6 pounds and works better for most mini-window air conditioner applications.

5. Whirlpool 5,000 BTU

The Whirlpool 5,000 features a compact and durable design with 5,000 BTU that can cool a room of up to 150 square feet. This lightweight window air conditioner weighs 39.7 pounds. Its dimensions are 15.3 inches x 16 inches x 12.5 inches.

6. LG LW6017R 6,000 BTU

This is one of the smallest window air conditioner with 6,000 BTU capacity. It can cool up over 250 square feet at a time. This lightweight air conditioner is 17.31 inches x 14.38 inches x 11.13 inches. It is only 39.6 pounds and can be fitted on windows around 18 inches wide.


Manufacturers built a variety of split systems that must meet customer requirements. Window air conditioners are rectangular or square and can be great for any space.

By learning about the dimensions of a window air conditioner, you are making your purchasing process much easier. You can immediately contact a manufacturer to order an AC that perfectly fits your window.

If you have never considered the dimensions of your home A/C, you can use a tape measure to record the measurements.