7 Best Casement Window Air Conditioners 2021 – (Reviews & Buying Guide)

best casement window air conditioner
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Are you reluctant to install an air conditioner because you have crank or casement windows? Well, you don’t have to suffer the summer heat as we have a solution for you.

Typical window air conditioners are designed for windows that open up and down. Therefore, it becomes difficult to install an air conditioner if you have a casement or sliding window.

However, casement window air conditioners or sliding window air conditioners are vertically structured to fit into casement and sliding windows. They are an affordable and effective cooling solution that allows you to cool your room without depending on your home HVAC system entirely. The only downside is that casement ACs are expensive and less energy-efficient than traditional window air conditioners.

best casement window air conditioner

Things have changed over the last few years, however, and manufacturers are producing slider casement window air conditioners that are not only energy-efficient, but also include advanced features. For example, programmable thermostats, multiple fan speeds, digital remote controls, and dual-stage carbon filters. Some slider air conditioner models even have Wi-Fi capabilities, meaning you can easily control them using an app on your smartphone or tablet or by voice commands.

In this buying guide, we have reviewed the best casements window air conditioners on the market to help you make the right decision.

7 Best Casement Window Air Conditioners Reviews

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

1. Frigidaire FFRS0822S1 8000 BTU Heavy-Duty Slider Casement Window A/C

Frigidaire FFRS0822S1 8000 BTU Heavy-Duty Slider...
  • Beat the heat while remaining cool and happy on hot summer days
  • With 2344.57 W cooling power, enjoy a blast of cool air throughout your room
  • Effectively cools area of up to 350 Sq. ft., this air conditioner is perfect for bedrooms
  • Provides enough cooling in your room with 3 fan speeds
  • Full-function remote control allows you to precisely control the temperature and fan speed from across the room
  • Power source type: Corded Electric
  • Mounting type: Casement/Slider

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

The Frigidaire FFRS0822S1 is one of the best casement window air conditioners on the market. It is ideal for small to medium rooms of up to 350 square feet. Other than it’s cooling capabilities, it can also dehumidify up to 3 pints of water in the air per hour.

It has an EER rating of 10.9 which means it is an energy-efficient unit that will help you save electricity. With washable filters, you don’t have to worry about high maintenance costs, neither will you be worried about bacteria or mould infestation.

The Frigidaire FFRS0822S1 has several highly-customizable controls including a programmable 24-hour on/off timer, programmable thermostat, multi-speed fan, clean filter alert, adjustable side panels, and remote control. It has other energy-saving features such as the sleep mode and energy saver mode.


  • Effective BTU power for less money as many of the A/C units in this category go for more.
  • Full-mode remote control capabilities.
  • 3-fan speed for customized air conditioning.
  • Reliable energy-efficient features.
  • Slick and elegant design.


  • Lacks an array of back cover options.
  • Noisy when working at full capacity.

2. Frigidaire FFRS1022R1 10000 BTU Slider/Casement Room A/C

Frigidaire FFRS1022R1 10000 BTU 115-volt...
  • Specially designed for casement-window or sliding-window installation - installation kit included (Not suitable for standard-window installation)
  • 10,000 BTU air conditioner cools a room up to 450 sq. ft. with dehumidification up to 3.4 pints per hour (Uses standard 115V electrical outlet)
  • Multi-speed electronic controls with 24-hr. on/off timer and full-function remote control
  • Auto cool, Energy Saver mode, Sleep mode, 4-way air direction and washable mesh filter with check filter alert
  • Energy Efficiency Ratio (EER): 10.4
  • Window height- 21.5 inch minimum / 40 inch maximum. Minimum window width- 15.5 inch

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

The Frigidaire FFRS0822S1 is another air conditioner for casement windows from Frigidaire. Unlike Frigidaire FFRS0822S1, this model is suitable for slightly large rooms of up to 450 square feet.

This unit is easy to install and features a multi-speed fan and 4-way air direction control that allows you to customize your cooling needs as well as direct the cold air when you need it the most. The washable mesh filter with slide-out access prevents bacteria, room odors and other airborne particles that might affect your indoor air quality.

You definitely can’t go wrong with this unit as it’s highly dependable and easy to maintain. For smooth operation, use the full-function remote control to adjust the temperature and fan speed from across the room. The thermostat will maintain the preset temperature so that your room remains comfortable at all times. Plus, the programmable timer helps you cool your room when you want without having to worry about running up your utility bills.


  • Full remote control enabled functions – making it convenient and highly user-friendly.
  • Washable mesh filter to lower maintenance cost.
  • 24-hour on/off timer for effective planning of home air conditioning cycles.
  • Auto-cool mode for energy saving purposes.
  • Dehumidifies over 3.4 pints per hour.
  • Modern and tech-oriented design.


  • Not suitable for double hung-window designs.
  • Relatively expensive.

3. Koldfront CAC8000W 8000 BTU 115V Casement A/C with Dehumidifier

Koldfront CAC8000W 8000 BTU 115V Casement Air...
  • 8000 BTU vertical window air conditioner engineered for spaces ranging in size from 300 to 350 square feet
  • Designed to fit casement (left to right sliding) windows ONLY, and will not fit windows that slide up and down. Fits windows 15-1/2" to 16-1/4" wide with a minimum height of 21-1/4" when using the window panel retainer and a maximum height of 39-7/16" (minimum window height of 20-5/16" without the window panel retainer)
  • Digital Display; Dehumidifier; Sleep Mode; 3 fan speeds; Remote control with 16ft range; LCDI 5-15P plug type
  • Energy Efficiency Ratio (EER): 11.0 / Energy saver mode
  • Includes all installation hardware and weather seals

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

This compact air conditioner is designed to fit casement left to right sliding windows only. If you have windows that slide up and down, then you want to consider other options in the list – some of them can be installed in both casement and sliding windows. The window measurement should be 15-12 to 16-14 wide with a minimum height of 20-516.

With 8000 BTU cooling capacity, this unit is powerful enough to serve spaces ranging in size from 300 to 350 square feet. Besides, it can remove unwanted moisture from your indoor environment.

The Koldfront CAC8000W offers a variety of modes and fan speeds with electronic Ready-Select controls. You can just set the thermostat to your ideal comfort level, select your desired operating mode and fan speed and let the CAC8000W provide cool comfort to your home.

With an Energy Efficiency Rating (EER) of 11.0, this energy star rated unit consumes less electricity to cool your home, helping you save on your yearly cooling costs. Its high EER rating proves it’s an efficient and economical choice.


  • Energy star rated which means it uses less electricity
  • Relatively cheap compared to other models.
  • Fully function controls
  • Can remove excess moisture from the room
  • Remote control for easy operation


  • Can only fit casement left to right sliding windows
  • Doesn’t cool room well


4. Kenmore 77063 6,000 BTU Casement Window Air Conditioner

The Kenmore 77063 6,000 BTU can be installed in either slider or casement windows. That makes it one of the versatile casement ACs on the list. It’s designed for small rooms of up to 250 square feet, and that makes it an ideal unit for a one-room office or studio apartment.

Besides having a 4-way 3-speed fan that can blow air towards any direction, this unit also has a programmable thermostat which allows you to set your desired temperature. In case you want to keep track of when to change the filters, there is an air filter reminder that will alert you when you need to do that.

Other remarkable features you’ll love about this unit are the robust remote control with a built-in thermostat and sleep and energy saver modes. The remote will allow you to adjust the temperature, fan speed and other change between modes from anywhere within the room. The energy saver and sleep mode will enable you to maintain your ideal room temperature all the time without worrying about your electricity bills.

Overall, Kenmore 77063 is an efficient and terrific unit for small spaces. However, it has a little higher decibel rating than other units on this list, so expect it to be a bit loud.


  • Offers quick and relatively quiet room cooling effects.
  • Dehumidifies 1.3 pints of atmospheric moisture per hour.
  • Energy-Star rated – meaning that you get to enjoy cool and fresh air without inflating your energy bills.
  • Remote control enabled functions for efficiency and flexible usability.
  • Washable filters – translating into low maintenance cost.
  • Has automated filter inspection options.


  • Not commendable for bedroom windows if you wish to run the unit at full capacity owing to noise.
  • Lacks antibacterial filters for effective eradication of pathogens.

5. Global Industrial Casement Window Air Conditioner 10,000 BTU

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

If you’re concerned with saving some cash on your electricity bills, get the Global Industrial Casement window AC. While it has a small design, it can serve rooms up to 450 square feet.

Like many other contemporary air conditioners, the Global Industrial Casement window AC has 4-way air direction which allows you to choose where to cool. Plus, the fan mode will enable you to maintain a cool indoor environment without relying solely on the air conditioner.

There is an auto-restart mode that will automatically restart the unit and resume the preset operating conditions in the event the power shuts down. Also, the sleep mode will maintain the set temperature settings without the unit consuming a lot of energy.

Take advantage of the remote to give instructions to your unit without leaving your sofa or bed. The LED display allows you to see the adjustments you’ve made as well as the modes you’ve selected. The timer will let you set the unit to run for as long as you want it to within 24 hours period.


  • High BTU ratings at a lower unit price.
  • Eco-friendly air conditioning properties.
  • Economical power consumption given its relatively high EER ratings.
  • Comes with a convenient installation kit and manual for a DIY A/C installation project.
  • 5-year warranty certification to guarantee quality.
  • Efficient sleep mode features.
  • Require no regular filter replacement.


  • Requires a minimum setting of 62 F for the unit’s temperature and compression-related features to work efficiently.
  • Relatively noisy.

6. PerfectAire 3PASC10000 10,000 BTU Window Air Conditioner

PerfectAire 10,000 BTU Slider Air Conditioner...
  • Adjustable temperature settings that range 62°F - 86°F (17°C - 30°C); cools areas between 400-450 sq. ft.
  • Expandable window mounting kit accommodates horizontal sliding or crank-out casement windows with a 15½”/16¼” (min./max.) window width and a 21¼”/39½” (min./max.) window height
  • 3-speeds in both cool and fan modes
  • Full function remote control with Follow Me portable thermostat technology for total room coverage
  • Front-mounted, tilt-out air filter access for easing cleaning

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

The PerfectAire 3PASC10000 is designed to provide the perfect cooling performance for rooms up to 450 square feet. This 10,000 BTU casement slider window A/C fits in different window types, be it casement, crank or horizontal sliding windows, so you don’t have to worry about costly custom designs.

Apart from being an air conditioner, this unit is also a fan and a dehumidifier. You can use the fan mode to circulate fresh air during those days when it isn’t warm enough for cooling. The dry mode will remove excess moisture from the air. There is an auto mode which turns on the unit in case the temperatures are below or higher than your desired room temperature.

The PerfectAire 3PASC10000 uses Eco-friendly refrigerant. It’s also easy to operate as it has electronic controls with user-friendly, soft-touch buttons and digital LED (light-emitting diode) display. An adjustable temperature setting that range from 62°F – 86°F (17°C – 30°C) is included so you can customize your cooling needs.


  • 7-step temperature settings for wide-ranging weather conditions.
  • Cools small and medium-sized rooms in less than 30 minutes.
  • Reusable filters since they can simply be vacuum-cleaned or washed.
  • Very affordable.
  • Compact and reliable design that fits an array of window designs.


  • Requires a power-step-down adapter for use in an area connected with power grids above 120V.
  • Gets noisy when in operation for long hours

7. Arctic King EWL08CRN1BJ9 Slide Casement Window Air Conditioner

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

The Arctic King EWL08CRN1BJ9 is an energy-efficient slider casement window air conditioner. It’s also cheaper compared to other models we have reviewed on this list.

This unit is the perfect cooling solution for homeowners looking to cool rooms that measure approximately 350 square feet. The powerful 8,000 BTU cooling capacity takes about 20 minutes to cool down the entire space effectively.

You can shift between the cooling mode and the fan mode for more personalized comfort. The sleep mode also adjusts the temperature for overnight comfort, so you don’t have to wake up in the middle of the night to turn off the unit when your ideal temperature is reached.

All these functions are accessible using the remote control. Additional features include a timer and 3-speed fan settings. Even better, the company offers one year warranty for damage parts and labor.


  • Reliable cooling power for small and medium-sized rooms.
  • Easy installation features – you need no help from an expert or anyone else to install this unit.
  • 3-cooling speeds with a set of fans that can simultaneously work in opposite directions.
  • A Budget-friendly unit from a reputable A/C manufacturer.


  • Less effective in large rooms.
  • Lacks remote control features

Casement Window Air Conditioner Buying Guide

Best Casement Window Air Conditioners in operation

Top Factors to Consider in Best Casement Window Air Conditioner

Before you go ahead and buy your next best casement window air conditioner, we advise that you take into account some of these key features as well as useful added extras.

1. Cooling Power/Area Coverage

It’s easy to determine an air conditioning unit’s cooling capabilities by looking at the bright yellow sticker on its chassis. The sticker displays the British Thermal Units (BTU). The higher the BTU rating, the larger the size of a room the unit can cool.

You may need a casement window air conditioner with higher BTU if the room you need to cool receives a lot of direct sunlight throughout the day. Other factors may come into play if you need a unit with higher BTU. For instance, if you use the A/C in multiple rooms subjected to heat-related activities such as the kitchen.

The BTU factor may also be considered if you already have another A/C system installed in place. If your living room space opens up to the bedroom or the kitchen, where you may already have a window casement air conditioner installed, then you may go for a unit with lower BTU ratings.

However, this can be a tricky situation if you’re not sure whether your home’s architectural design will allow the two or more air conditioners that complement each other. Subsequently, other than opting for multiple window casement air conditioners with higher BTU ratings, go for a centralized cooling system – a single top-of-range BTU machine that can cool off the entire house regardless of its architectural outlay.

2. Size

Casement air conditioning units come in various sizes and fit different window designs and sizes as well. For this reason, you must consider the maximum air conditioner size that your casement window will allow.

This is vital because a 26” square window can’t accommodate a 24” unit. If the window is rectangular, then you will need to have the right corresponding length and width measurements, unless you intend to restructure or customize the window size at an extra cost.

You can also use double hung air conditioner for small window opening only if you don’t intend to modify your casement window.

3. Weight

When it comes to weight, remember that fixed window air conditioners, especially those with higher BTU ratings are heavy. Windows that sit on wooden walls can, for example, carry light-weight A/Cs. Even so, you have to make sure the wall is structurally fit to handle the vibration effects produced by these units when they are operating.

Structurally strong buildings with strong pillars can, on the other hand, carry heavy conditioners without a problem – making it wise to know when to buy two smaller BTU units or a single heavy unit based on your home’s structural attributes.

4. Location

Location is another factor you need to seriously mull over before purchasing and installing these types of ACs. For instance, you can’t lift an 8000 BTU unit for installation on a window that is several stories high. Should this be necessary, you should factor in the cost of hiring cranes and a team of experts. If not, split the cost of the mega unit between two or three, so you can purchase a cheap portable air conditioner unit under $200 for every room in your home.

5. Filtration Challenges

The lifeblood of an effective air conditioner lies in the quality of its filtration system. Don’t go for an A/C unit because it’s elegant in design and affordable in price without considering its filter replacement needs. Ask the dealer whether the replacement filters are readily available and affordable.

You may also want to know about their ability to trap dust, pathogens, and pollutants since the quality of A/C filters also differ in this aspect. An array of modern air conditioners use washable filters – a maintenance cost reduction factor that you may want to consider as well.

6. Methods of Operation

As you shop around for a new window air conditioner for large room, take the best deal possible, and this includes the unit’s operation modules. An A/C with simple mechanical controls is a clear indication that it’s an old model. While it’s not necessarily a bad idea to choose old models, it’s always wise to select modern units that are convenient, durable and reliable. These types of air conditioners have digital readouts, user-friendly interfaces, and remote control sensors that make them easy to use.

7. Energy Efficiency Ratings

Abbreviated as EER, energy efficiency rating is a factor that you shouldn’t miss out in your list of considerations as you obtain a new A/C. The higher the EER number, which is also printed or engraved on the yellow BTU sticker, the lower the amount of electric power you will use to cool your house, and this translates into lower overhead bills.

8. Air Speed

Having a single speed A/C is not a good idea because the weather keeps on changing. An A/C with at least 3 to 4 different airflow speed patterns enables you to adjust the airflow depending on the temperature in the room. You can also slow down the air conditioning process if you want to set the unit on a relatively quiet mode or if you wish to save energy.

9. Programmable Timer and Operation Cycles

A/C units have gone high-tech with the emergence of technologies such as artificial intelligence (AI) and the Internet of Things (IoT). IoT grants you the ability to air condition your home or office from anywhere in the world. It allows you to program the system on various modes without using its manual controls. For example, the unit can be programmed to switch itself on/off in line with your air conditioning needs.

10. Warranty Considerations

Slider casement window air conditioners are affordable – and you even be lucky to get window air conditioners under $100. However, you need to make sure you get an extended warranty for your unit. Warranties that cover repairs, maintenance, and consequential damages are the best. Warranty is also an excellent way to prove that a company indeed stands behind their product.

Casement Window Air Conditioner Installation

casement window air conditioner installationIf you live in a hot area with high humidity levels, you may find it challenging to make your home the cool haven you want it to be. You’re probably already aware that what you need to make your home comfortable during summer is a slider or a window casement air conditioner. And the model you choose depends on whether your window opens upwards and closes downwards or otherwise.

After purchasing a casement window AC, the next step is to install it. You can DIY  or hire a contractor. Either way, make sure you have the right measurements for your window and the unit.

The installation instructions we have provided are for Frigidaire Casement/Slider Room units with BTUs that range between 8000 and 12000. However, this is a standard procedure that you can use to install the majority of A/C units or brands. You only need to take note of the horizontal measurement as it would affect your window frames. That said, before we get to the installation steps, let’s look at some of the frequently asked questions regarding A/C installation procedures.

Casement Window AC Installation FAQ

Q – How complicated is it to install an A/C unit?

A: The installation procedures may appear complicated when reading through the instructions in the user manual. However, the process is simple once you understand how the unit‘s parameters work.

Q- Is the unit installed from the outside or the inside?

A: It’s possible to install an A/C unit single-handedly from the inside. However, there is a screw that you need to fix on the outside. The outside screw provision is approximately a foot below the window level, and it’s advisable to fix it from the outside. Why? Because hanging from the window to install your AC is demanding and dangerous.

Q- What holds the unit in place?

A: On the outer side, the air conditioning unit is supported by a platform assembly which is a form of a metal brace that can be installed from the inside. The front section is held in place by a wood-based support system which you can make on your own in line with your house décor aspirations. With these fittings in place, the unit naturally clears off the space left at the bottom level of the window, but you still need to seal off a couple of gaps.

Q – How can I fill in the gap left between the unit and the upper window frame?

A: In most cases, the unit will come with a plastic board for this purpose. If it doesn’t, then you can buy the plastic sheeting from a home improvement store near you. The sheeting is very cheap.

Q – How can I lift the heavy units?

A: It’s advisable to find someone to help you lift it. Particularly, this is probably the only part of the installation process where you might call for help, especially if you’re looking at an 8000 BTU or a bigger unit. These are wide units and an attempt to lift them on your own may result in self-injury. Here are a couple of tips should you decide to lift and fit the unit on your own.

  • Position the unit strategically to have the back and the front facing their corresponding sides while it’s still on the floor.
  • Pull up a table or a stool close to the window to act as you landing base.
  • Hold the unit using both hands with your left hand placed on the upper left back while your right hand supports the lower right corner.
  • With a steady grip, lift the unit and place it on the table or the stool before you take on a second lift to put it on the window.

Installation Procedure: Step by Step Guide

NOTE: These instructions are given based on the assumption that you will be installing the unit to the right side of the chosen window.

Step 1: Install the Platform and the Support Base

Start the installation process by providing a strong support base. This is essentially a piece of horizontal wood that’s fixed in line with the bottom window seal. The idea is to enhance the window’s structural support, seal the gap that will be left between the unit and the original bottom window seal and provide a base for the installation of the metal brace provided by the manufacturer. You can’t ignore this step because the original base window is not usually strong enough to handle the unit’s weight.

  • Offer Base Support

The base is traditionally supported both vertically and horizontally. To do this, cut a wood board that’s slightly longer than the unit’s width. Ideally, the wood should be approximately 17” long; it could be somewhat longer but not too long if you care about the aesthetics of your work. The next step is to measure the height to cut another wood board that’s equivalent to the length of your window’s bottom track. The plan is to create a window A/C support system that’s independent of the original window’s structural outfit.

  • Assemble the Platform

Adjoin the platform assembly to the support base at the front edge. Ensure that the long edge protrudes outwards. Rivet the platform assembly to the support base by firmly driving in a screw through the platform assembly’s center hole.

Step 2: Determining the Center Hole

Another important aspect of the installation process since the unit’s efficiency, once installed, depend on it. To get it right, measure the windows outer most edge – commonly referred to as the leading edge or the window jamb. In other words, find the left-most edge of the window’s frame to the left – this is the side that the window’s edge will butt against the air conditioner once it’s installed. You can do this using a calibrated measuring tool, but a drywall T-square will give you a more accurate idea of the center point. Assuming that it’s a standard window, the center mark will fall at 8 11/16”. This is the point where you drill in the assembly screw highlighted in the previous step.

Step 3: Fix the Adjustment Platform

Use the manufacturer’s manual to put the platform assembly together. This means that you will have to go outside and screw up the siding to strengthen the base. Secure your support base using high-grade plywood as you do this.

Step 4: Position the Purifier on the Window

Lift the unit carefully and gently push it through the window space until it lands on the platform assembly. Take great caution to avoid dropping the unit. Once in position, pull the window sash to close against the unit’s left side. Ensure that the sash falls behind the metal bracket since it’s the metal bracket that pushes against the sash to hold the A/C in place.

Step 5: Achieve a Backward Tilt

It’s vital to make sure that the air conditioner has a slight backward tilt because all casement and slider air conditioners extract moisture from the air that they suck in. The tilt enables the unit to dispense the water to avoid rust and natural degenerative issues that may be brought about by the accumulation of water within the system. Most manufacturers recommend a one-quarter of an inch through the unit’s weight can increase the tilt to a quarter of an inch during installation.

Step 6: Seal the Window Unit

Seal the gap left at the top of the window with an acrylic sheeting. Remember to measure the panel frame’s height before you remove it. You can then pull off the frame and seal the gap or else you will leave a gap that exposes your house to the outside environment.

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As you might realize, casement window air conditioners are the perfect cooling solution for homeowners with a casement window. While these units are slightly expensive than “ordinary” air conditioners, they are more of a long term solution to most homes. However, there are also other portable and window air conditioners that you can install in crank windows.

If you have decided that casement window air conditioner is all you want for your home, make sure install it correctly for maximum cooling performance. If you’re facing difficulties, don’t be afraid to consult a local HVAC specialist.

We hope that this casement window air conditioner review has shed some light, and you can make an informed decision when you go shopping.