Casement air conditioners: 4 best casement window air conditioners and installation steps

4 best casement window air conditioners and installation steps

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If you need to cool a space that has casement windows, this list is for you! Our vetted list of best casement window air conditioners will bring a breeze of fresh air.

Many reputable brands manufacture casement window air conditioners designed especially for hinged windows. In general, these specialized ACs stand vertically (as opposed to traditional window ACs that are horizontal in design). 

What is a casement window?

A casement window opens to the right or left via a hinge, similar to a door. They are occasionally called crank windows, because you must turn a handle that cranks the window open.

Casement window ACs usually come equipped with a window air conditioner installation kit that enables mounting. Traditional window ACs use the window sash for stability. Since casement windows don’t have a sash, they require a more involved installation process.

Following, we’ll share our top casement window air conditioner picks. After that, we’ll detail the steps for installation.

Best casement window air conditioners

Best overall

Frigidaire FFRS

  • Affordable
  • Dependable
  • Quiet

Buy on Amazon

Easiest installation

Keystone slider AC

  • Lightweight
  • Dust filter
  • Sleep mode

Buy on Amazon

Best features

Koldfront CAC

  • Energy-efficient
  • Dehumidifier
  • Remote control

Buy on Amazon

Most energy efficient

Perfectaire PASC

  • Eco mode
  • Highest SEER rating (13)
  • Remote control

Buy on Amazon

The best casement window air conditioners

Before you start shopping for a casement window air conditioner, calculate what size you need. ACs use the measurement British Thermal Units (BTUs) to signify a unit’s power. 

A good rule of thumb is to multiply the square footage of your space by 20 to determine how many BTUs your AC requires. For example, a 400-square-foot room needs an AC with at least 8,000 BTUs to cool it.

Space size Size AC required
Up to 250 square feet 5,000 BTU casement window air conditioner
Up to 400 square feet 8,000 BTU casement window air conditioner
Up to 500 square feet 10,000 BTU casement window air conditioner
Up to 600 square feet 12,000 BTU casement window air conditioner
Up to 700 square feet 14,000 BTU casement window air conditioner

Many of our top picks come with varied options for BTU. Make sure you select the correct BTU output when you place your order. 

Best overall casement window air conditioner

Frigidaire FFRS line

The Frigidaire FFRS casement window AC is not only our favorite but the most affordable of our picks. We love that it has adjustable side panels so you can make it fit your window perfectly. 

It operates quietly at 48.4 decibels – about the volume of a soft conversation in a library. And you can control it via remote. So, this window AC is perfect for literally chilling out at home!

We also like the cooling options the Frigidaire FFRS line offers. You can use its 24-hour timer and sleep mode to automatically change the temperature. These features also help conserve energy.

The washable air filter is another plus. You can maintain healthy air quality and save money on filter replacements.

This Frigidaire casement window air conditioner is available on Amazon in 6,000-, 8,000-, 25,000-, and 28,000-BTU models. It’s ideal for both small and large spaces.

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Easiest installation

Keystone slider casement window AC

Keystone’s casement window air conditioner weights about half of the other models on our list at 34 lbs. If you’ll be installing the AC yourself or have concerns about your window supporting 70-ish pounds, this model is for you.  

We like that this Keystone allows you to control the airflow direction for ultimate comfort. Additionally, it has three fan speeds plus dehumidifier and sleep settings. Its dust filter is helpful for allergy sufferers.

This model only comes in a 10,000 BTU version. So, if your room is significantly larger or smaller than 500 square feet, the Keystone casement window air conditioner won’t work for you.

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Best features

Koldfront CAC line 

The Koldfront CAC line of air conditioners comes with an impressive array of features to enhance your comfort. We appreciate the built-in dehumidifier and three fan modes for the perfect breeze. 

Though many casement ACs require you to purchase a separate window air conditioner installation kit, the Koldfront CAC has everything you need. This includes a weatherproof cover to seal any open portions of your window.

Koldfront’s CAC models are decently energy-efficient. They feature a digital temperature display and remote control. We think this is a solid AC, but many users report it runs louder than expected.

The Koldfront CAC line is available on Amazon in 8,000- and 10,000-BTU models, ideal for spaces between 250 and 500 square feet.

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Best energy efficiency

Perfectaire PASC 

Perfectaire offers many window AC options, but this is its sole model designed specifically for casement windows. It’s only available in a 10,000 BTU version.

What we like best about this system is its Seasonal Energy Efficiency (SEER) rating of 13, higher than the other casement window air conditioners on our list. Its Eco Mode automatically turns the AC on when the temperature exceeds your set limit.

If you live in an extremely hot climate (e.g., the Arizona desert), the Perfectaire PASC may not be powerful enough to cool your space. In more temperate regions, it will get the job done. 

This is not the quietest window AC we’ve reviewed, so choose another option if you’re cooling your bedroom.

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Another AC option for casement windows

If having to lift and install a casement window air conditioner seems like too much work for you, there’s another option: purchase a portable air conditioner and a venting kit for vertical windows (this one’s our favorite). 

Most portable ACs come pre-assembled and easily roll into place right out of the box. Window venting kits are simple to install and customize for your window size. This solution obscures less of your window and is more aesthetically pleasing from the outside of your home.

If this sounds like a better match for you, check out our full guide to the best portable air conditioners. 

How to install a casement window air conditioner

Note that except for the Keystone AC we reviewed above, most casement window air conditioners weigh about 70 lbs. You’ll probably need to enlist the help of a friend to lift your AC into your window. 

If your unit doesn’t come with a window air conditioner installation kit, make sure you purchase one separately. These typically include a mounting bracket and window seals.

Review the instructions before you get started. Gather all the necessary tools beforehand, which may include a screwdriver, measuring tape, and a ladder.

Step 1: Install a support

Seventy pounds is a lot of weight for your window sill to carry. A bracketed mount will help distribute the load.

Follow the instructions for your support bracket. It will screw into the side of your home. You may have to set up a ladder outdoors if you can’t reach from inside the window.

If your crank mechanism or hinge is in the way, take it apart and remove it. Put it somewhere safe to reinstall it once the weather cools down, and you want to take the AC out.

Step 2 : Position the AC

Once the support is ready, lift the air conditioner into place, resting it on the bracketed mount. Make sure the AC is flush with the window frame.

Close the window on the other side of the AC as far as you can. If you have a sliding window, position the window sash in the slot for it on the side of the AC.

Step 3: Seal the window

Follow the directions on your window AC installation kit to cover the gaps left in your window. The panels used to do this usually match the color of the AC unit.

Alternatively, visit a hardware store and have a piece of plexiglass cut to size. This will fit above the casement window air conditioner, so you keep some visibility from the top of your window.

Though installing a casement window air conditioner is generally a DIY job, you can pay an HVAC expert to help set you up. The job should be fairly inexpensive compared to the cost of installing a central AC. 

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The bottom line on casement window air conditioners

Casement window air conditioners can help you cool rooms with narrow windows, whether they crank open or slide. Using our chart above, choose one with the right BTU for your square footage. 

There are some effective and affordable casement window air conditioning units on Amazon. Our favorites have good energy efficiency and run quietly.

Casement window AC installation is something you can do yourself if you choose a smaller device. For units that way around 70 pounds, we recommend you ask a friend to help you lift the unit into your window. 

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What are Casement Window Air Conditioners?

Casement windows are a nice touch for any home, especially in kitchens and bathrooms. However, for rooms lacking traditional windows, it can be a challenge to cool them with a regular window air conditioner.

The answer: Casement window AC units.

What are Casement Windows?

Casement windows are windows that are hinged on the side, and which open outwards through a crank handle. Compared to most other windows, a casement window can be opened all the way. This makes them a popular option for rooms that require higher ventilation, such as kitchens and bathrooms.

Casement windows also offer other advantages, including:

Higher airflow

By opening outwards vertically, casement windows naturally create a flap that catches more air and directs airflow into the room. You can even control the amount of breeze by adjusting the window angle.

Better aesthetics and More light

Since casement windows lack frames in the middle of the glass, they look better and provide an obstructed view of the outside. This also lets in more light, similar to picture windows. Unlike picture windows however, casement windows have the advantage of being opened.

More energy-efficient

Compared to sash windows, casement windows have stronger seals. Because they lock at several points in the frame, they are more airtight, minimizing any air gaps or heat leakage.

More accessible

Some areas are difficult to reach, such as the space above kitchen sinks or high up in shower stalls. Casement windows are a convenient option in such spaces thanks to its crank handle.


What are Casement Window Air Conditioners?


As the name suggests, a casement window air conditioner is specifically designed to fit casement windows. 

Traditional window air conditioners have  a rectangular shape with more width than height. While some offer accordion seals to fit sash windows, they are still an ill fit for casement windows since it will leave a large gap vertically. 

Casement window ACs are narrower in shape. They are made to fit windows that swing out vertically, and are at least 20 inches in height. They may also come with precut window inserts to fit most casement window designs. 


Casement Window AC vs Other Window Air Conditioners

It can be easy to confuse casement ACs with other types of window AC units. Here are the differences:



Casement window AC

Narrow body: taller than wider to fit casement windows

Window air conditioner

Box type body: wider than taller 

Sliding window AC / slider AC

Window ACs made for sliding windows using a window installation kit to fill the gap


Casement AC vs Portable AC

Some homeowners opt to use portable air conditioners instead of casement window ACs.

The difference between the two is that portable ACs typically sit on the floor. They may either be vented (which requires an exhaust hose going out to the window), or ventless, which are less efficient but don’t require any windows to vent the exhaust.

The advantage of portable ACs is that they allow the casement window to remain unobstructed. They are also expensive and cheaper to install. However, portable ACs take up floor space, particularly vented models that require a hose and need to be placed closer to the window.


How to Choose a Casement Window AC


1. Determine the window dimensions

All casement ACs are less than 15” wide. However, you need to take into account the crank window installation kit, which can add an extra inch to the total width.

Manufacturers typically provide a minimum window width in the specs sheet. The industry standard is 15 ½” minimum window width. Make sure the AC’s specified minimum window width and maximum window height falls within your casement window dimensions.


2. BTU sizing

The cooling capacity of all AC units are measured in BTU (British Thermal Unit). While standard window ACs can go up to 15,000 BTUs, casement window ACs have a typical upper capacity of 8,000 to 10,000 BTUs owing to their narrower design. 

Use our BTU calculator to determine the required capacity for your particular room.


3. EER

EER stands for Energy-Efficiency Ratio, which is a measure of energy efficiency derived by dividing the BTU with the wattage. The higher the EER, the more energy-efficient the unit is..


Recommended Casement Window ACs for 2022


Frigidaire FFRS0822SE 8000 BTU Slider/Casement Window Air Conditioner

The FFRS0822SE is built specifically for slider and casement windows. It has an 8,000 BTU cooling capacity and 10.8 EER, capable of servicing spaces up to 350 sq. ft. depending on ceiling height.

The FFRS0822SE features electronic digital controls for ease of use as well as a full function remote control. Additional features include a 3 speed fan, sleep mode and auto restart in the event of a power failure.

A window installation kit is included for the best fit for your window.

Price: $599.00
DISCONTINUEDFrigidaire FFRS0822SE 8000 BTU Slider/Casement Window Air Conditioner

If you have slider or casement windows, you may have thought that installing an air conditioner unit was not possible. Frigidaire has built the FFRS0822SE speci…

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Frigidaire FFRS1022RE 10,000 BTU Slider/Casement Window Air Conditioner

This casement window AC is capable of 10,000 BTUs and has a 10.4 EER. It is a great solution for rooms that are up to 450 sq. ft. depending on ceiling height.

Like its smaller cousin, it also comes with digital controls, a remote control unit, filter change indicator, 24 hour on/off timer, and 4-way air control.

A window installation kit is included. This unit plugs into a standard household outlet and includes a 6′ power cord.

Price: $649.00
DISCONTINUEDFrigidaire FFRS1022RE 10,000 BTU Slider/Casement Window Air Conditioner

If you have slider or casement windows, you may have thought that installing an air conditioner unit was not possible. Frigidaire has built the FFRS1022RE …

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How to ventilate a portable air conditioner –


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    To cool a room, all portable air conditioners must be properly installed and blow out hot air as it cools. This warm air is usually expelled outside with the included window kit, but traditional windows are not always available.

    Why ventilate a portable air conditioner?

    Mobile air conditioners cool your room by removing hot air from the room. If warm air is not vented outside, it will stay in your room, negating the cold air that enters your space.

    How to install a portable air conditioner with a window kit

    Most portable air conditioners, compared to cassette air conditioners, are easy to install and ventilate with a window kit provided by the manufacturer. In just a few steps, you will be on your way to a more comfortable interior space.

    Standard window kit includes a window bracket, one or two vent hoses and vent hose adapters. Follow these steps to quickly set up your portable air conditioner:

    1. When venting the portable air conditioner, connect all hose connectors/adapters and insert the hose(s).
    2. Extend the adjustable window kit to the length of your window. If necessary, trim the window bracket to fit snugly against the window. Your specific model may come with screws to hold the window kit in place. Then close the window to secure the kit in place.
    3. Then connect the ventilation hose to the window kit. If your model is properly installed and ventilated, you can start cooling immediately. Just plug it in and program your settings.

    Sliding Window and Sliding Door Ventilation

    Standard window brackets are designed for horizontal installation at the bottom of windows, but can also be installed vertically to fit sliding windows and sliding doors. Some window bracket modifications may be required to install air conditioners on sliding windows.

    For sliding windows, make sure the bracket is long enough to fit the opening. Blocks with double window brackets usually work well for sliding windows. The double bracket includes a standard window bracket and an optional filler bracket. After installing the bracket, if there is still a hole in it, you can fill it with insulation.

    With sliding window air conditioners, the window brackets will not be long enough to fill the vertical opening, so you will need to fill the extra space with some other material.

    Casement windows

    Since casement and pivot windows open like doors, standard window sets are not suitable. Many buyers who have hinged windows simply cover the entire window opening with plexiglass and cut out a hole for the exhaust hose.

    Wall ventilation

    Some people prefer to vent hot air through a vent in the wall, directly outside or into another area such as a garage or storage room. You can use a jigsaw to cut a hole to the desired size in the wall, but make sure there is no wiring or plumbing where you want to cut the hole. The edges of the hole can be sealed with silicone sealant.


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    Window Air Conditioner Buying Guide –

    Published: October 10, 2022

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    Window air conditioners provide effective room cooling in rooms or apartments that do not have access to central ventilation and air conditioning systems. For installation, all you need is an appropriately sized window (or wall space), a warm room, and a desire to relax in a cool environment on a hot summer day. They are more energy efficient and environmentally friendly than mobile air conditioners.

    Window air conditioner models are independent cooling systems designed to cool one or two rooms. Traditionally, these units are mounted semi-permanently inside standard vertical sash or double sash windows or permanently inside a measured and prepared wall opening.

    Window air conditioner consists of three main parts: compressor, condenser coil and evaporator coil. The standard window air conditioner is also equipped with two motorized fans, expansion valve, air filter, manual or digital thermostat and control panel. To cool indoor air, they use a refrigerant, a chemical compound used in refrigeration systems to absorb heat from the environment.

    All models cool by extracting hot and humid air from the room, cooling and dehumidifying it, and returning it back to the room, expelling warm air outside. Technically speaking, a window air conditioner uses its compressor to compress the refrigerant into hot gas at high pressure. The gaseous refrigerant then passes through the condenser coil where it condenses to liquid and is directed through the expansion valve and evaporator coil to absorb heat and cool. Hot air is expelled through the back of the air conditioner – the part facing outward – while cold air is blown into your room through the air return grill located on the front of the system.

    Cooling capacity

    The cooling capacity of a room air conditioner is measured in thermal units per hour. To ensure high efficiency, choose an air conditioner with a level of air per square foot of your room or space.

    If you use a window air conditioner that is not strong enough to cover a large room, it will run overtime trying to bring the temperature down. In contrast, a window air conditioner that is too powerful for your room will cool it, but will not remove as much moisture from the air as a properly sized unit should.

    Type of installation

    When choosing a window air conditioner, you must also consider where you install it. The most popular window models are designed for installation in double hung or vertical opening windows, but there are several options.

    When installing a window in a double sash window, you need to accurately measure the dimensions inside the window frame, paying particular attention to the width. With these dimensions in hand, find the minimum and maximum window widths listed on the air conditioner specifications. Don’t worry if the window air conditioner doesn’t fit exactly to your window frame. All window air conditioners come with installation kits that include adjustable side shades to cover any extra space left on each side of the window opening.

    If you plan to install it through a wall, first make sure that the desired device is suitable for this type of installation and that you have the appropriate mounting kit. Not all window air conditioners can be installed through the wall. Check the specifications to see if your model has this option.

    Then write down the dimensions of the finished wall opening, which should be indicated in the instruction manual. Use these dimensions when creating an opening in the wall. If necessary, consult a professional when attempting to install a window air conditioner through a wall.

    Once fully installed – whether in a window or through a wall – the window air conditioner should be installed exactly inside the opening, with the warm air outlet facing outward and the cold air return inward. Some models have a retractable chassis and strong mounting sleeves that help stabilize each unit and provide easy service access. Be sure to follow the manufacturer’s installation instructions that came with your device.

    Electrical requirements

    Window air conditioners are more powerful than other conventional household appliances. Because of this, you will need to ensure that your existing electrical system is suitable for the needs of your chosen device. Most room air conditioners operate on 115, 125 or 220 volts.

    Advanced Features

    These features are designed to give you more control over how your device works and, in some cases, increase your efficiency. Most models come with digital controls and remote controls, but some models have manual dials.

    Many window air conditioners are equipped with additional operating modes, making these models do double or even triple duty in your environment. These can be fan only settings for ventilation, independent heating modes, dehumidifier modes, and air purification modes.

    Most air conditioners are equipped with basic air filters that help remove large particles from the incoming air that could otherwise enter the system and affect its operation. These filters are getting more advanced at a higher price, and some can also remove odors and smoke as well as airborne germs. Mosquito traps are security screens that work in the same way, preventing mosquitoes and other insects from entering the air conditioner and your room from outside.

    Some air conditioners have adjustable louvers that can be operated horizontally and vertically to direct the airflow in multiple directions. This ensures better air circulation throughout the room. Programmable timers allow you to set the operating time and manage energy consumption. Remote controls provide the convenience of selecting and setting functions from a distance.

    Security & Safety

    Window air conditioners have become safer to install and operate over the years with the introduction of stronger window kits, electrical plugs and current proof power cords. Be sure to strictly follow the manufacturer’s installation instructions when installing a window air conditioner through a window or through a wall. When properly installed, the AC unit should stand firmly and securely in place without any possibility of displacement. Often you may need to use additional window brackets to support your window sufficiently. They can be purchased separately.

    Safety becomes a problem when the window air conditioner is not fixed properly or you use loose objects to support it. It is also not recommended to place objects on top of the case. These objects may include items such as bricks, wood blocks, flower pots, satellite dishes and/or bird feeders. Safer electrical cords with current protection and polarized plugs greatly reduce the risk of electric shock during operation. Extension cords are not recommended.

    Some window air conditioners are equipped with intrusion protection systems to deter intruders. These systems are made of steel retaining wire that secures the chassis to a mounting sleeve to prevent intrusion.


    To maintain efficient and long service life, clean your window air conditioner thoroughly at least once a year. Don’t wait until you find faulty work. Retractable housing window air conditioners make maintenance easier as all you have to do is slide the unit out to access it. Refer to your air conditioner owner’s manual for maintenance tips and procedures. In many cases, all you have to do is use a crevice vacuum cleaner and a soft brush to brush dust and dirt off the internal components.