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Best Air Conditioners for Casement Windows | Beat the Heat

The use of air conditioners for sliding/casement windows is increasing of late. Among the many models I checked out, the FRIGIDAIRE FFRS1022R1 is my top pick. However, the PERFECT AIRE 3PASC10000 and FRIGIDAIRE FFRE063WAE are also great options.

Best Air Conditioners for Casement Windows

Looking for a window AC for your sliding or casement window? With so many options available, it can be overwhelming to decide where to begin.

But choosing the wrong casement window AC unit can lead to inefficient cooling, wasted energy, and unnecessary expense. Luckily, we've done the research for you and compiled a list of the best portable air conditioners. Keep reading to find the perfect AC unit to keep your home cool and comfortable.

Best Air Conditioners for Casement Windows

Here is the list of the 7 best air conditioners for casement windows that you can use to cool the atmosphere of your room quickly and efficiently.

1. FRIGIDAIRE FFRS1022R1: Perfect Cooling Solution for Small Spaces

The Frigidaire FFRS1022R1 is the perfect solution for those who have casement windows in their homes. With 10,000 BTUs of cooling power, it can quickly cool a room of up to 450 square feet. Plus, it comes with a dehumidifying function that removes up to 3.4 pints of moisture from the air per hour.

Installation is a breeze, as this window AC unit is designed specifically for casement or slider windows. The included installation kit has everything you need to get it up and running in no time.

And once it's installed, the electronic controls and full-function remote make it easy to set your desired temperature and fan speed. The unit also features auto cool, energy saver mode, quiet mode, 4-way air direction control, and a washable mesh filter with a check filter alert.

Overall, the Frigidaire FFRS1022R1 is an excellent choice for anyone needing reliable and efficient cooling. It may not have Energy Star certification, but its powerful performance and easy installation more than make up for it.

SEER: 10.4 | Cooling Power: 10,000 BTU | Energy Star: No | Floor Area: 450 sq. ft. | Special Feature: Remote control

2. PERFECT AIRE: Best for Cooling Rooms Sized Up to 450 sq. ft.

Looking for a casement air conditioner that can efficiently cool your space without making noise? The PerfectAire 10,000 BTU Slider Air Conditioner might be the perfect fit for you!

Best for rooms sized up to 450 square feet, this sliding window AC comes with a full range air direction control that ensures that the air reaches and cools every corner of the room. 

It is loaded with features that make it a convenient option for any user. The slide-out filter access makes it easy to clean and maintain. With just a simple slide, users can easily remove and clean the filter, ensuring that it operates at optimal performance. 

Moreover, this casement window AC unit comes with electronic controls. This feature enables users to adjust the temperature, fan speed, and mode from anywhere in the room, providing an added level of convenience and ease of use. While it might be a bit pricey, the energy-saving features and easy-to-use controls make it a worthwhile investment.

SEER: 13 | Cooling Power: 10,000 BTU | Energy Star: No | Floor Area: 450 sq. ft. | Special Feature: Remote control

3. FRIGIDAIRE FFRE063WAE: Best Multi-speed Fan & Programmable Timer

The Frigidaire Window-Mounted Room Casement Air Conditioner is an excellent option for anyone looking to cool down a small to medium-sized room. Its 6,000 BTUs of cooling power can quickly and effectively cool down the space. This casement window AC unit also boasts a multi-speed fan with three fan speeds, providing additional cooling flexibility.

It maintains the preset room temperature, ensuring that you are always comfortable. Additionally, this casement window AC unit has a Sleep Mode that gradually increases the temperature by a few degrees over the course of the evening, providing maximum comfort while also saving energy.

This sliding window AC is designed with an adjustable space-wise design that has optional side panels, which extend to best fit your window. It even has an easy-to-clean washable filter that captures dust from the air and ensures the dehumidifier operates efficiently.

What's more, this sliding window AC is ENERGY STAR Certified, which means that it consumes less energy than typical air conditioners, reducing energy usage and lowering utility bills. Additionally, the unit comes with a remote control, enabling you to adjust the temperature and fan speed from a distance.

SEER: 12.2 | Cooling Power: 6,000 BTU | Energy Star: Yes | Floor Area: 250 sq. ft. | Special Feature: Dehumidifier

4. GE: Best for No-Hassle Installation 

Introducing the GE Casement Window Air Conditioner 5000 BTU, a powerful cooling unit designed to cool smaller rooms up to 150 sq ft efficiently.

Equipped with a mechanical thermostat, this casement window AC unit provides two cooling modes and two fan speeds to offer flexible and optimal room temperature. The controls with ten temperature settings make it easy to adjust cooling to your comfort level. Plus, with the low-noise operation, you can keep the cool air flowing with minimal disruption, making it ideal for nighttime use in bedrooms.

Regular cleaning of the filter every 30 days helps ensure that your unit runs smoothly and efficiently. The fixed chassis design and included EZ Mount installation kit make it easy to install this unit in a double-hung window.

One thing to keep in mind is that this is a mechanical unit, meaning that it doesn't come with digital controls. However, this also means it's incredibly easy to use and set up.

SEER: 2.6 | Cooling Power: 5,000 BTU | Energy Star: No | Floor Area: 150 sq. ft. | Special Feature: Easy installation

5. LG: Best for Quiet Operation in Medium-Sized Rooms

LG Mounted 8,000 BTU Casement Window Air Conditioner is an excellent choice for those who want to cool their medium-sized rooms without spending a fortune on electricity bills. With its 8,000 BTU cooling power and a SEER rating of 13, this window AC is energy-efficient and can cool rooms up to 350 square feet. 

Its easy-to-use controls and full-function remote make it a convenient option, and its energy-saving capabilities make it an excellent long-term investment. With its low-noise performance, you can enjoy a calm and peaceful environment without any unnecessary noise.

One of the most notable features of this casement window AC unit is its energy-saving capabilities. This casement window air conditioner is Energy Star certified, which means it has met the high standards of the Energy Star program using energy-efficient technologies that translate into electricity savings.

SEER: 13 | Cooling Power: 8,000 BTU | Energy Star: Yes | Floor Area: 350 sq. ft. | Special Feature: Remote control and energy-saving capabilities

6. KEYSTONE: Affordable with Flexible Energy Star Options

If you're looking for an affordable and efficient air conditioning unit to cool a small room, the Keystone 6,000 BTU Window-Mounted Air Conditioner is an excellent choice. This energy Star-rated air conditioner has a SEER of 12.2, which can help you save money on power bills.

This air conditioning unit has electronic controls with an LED display and a temperature-sensing remote control that lets you conveniently set and maintain the room temperature from anywhere in the room. It also features a thermostat that signals the AC to cool the space based on where you are, ensuring an even temperature throughout the room.

With the ability to cool a room up to 250 square feet and a dehumidification rate of up to 1.5 pints per hour, this casement air conditioner is perfect for small rooms like apartments, bedrooms, and living rooms. It also has money-saving features like energy saver mode, sleep mode, and a programmable 24-hour timer.

SEER: 12.2 | Cooling Power: 6,000 BTU | Energy Star: Yes/No (both variants available) | Floor Area: 250 sq. ft. | Special Feature: Dehumidifier

7. MIDEA: Best for Wide Reach Cooling

The Midea 12,000 BTU EasyCool Window Air Conditioner is a great option for cooling and dehumidifying spaces up to 550 sq. ft. It has three modes - cooling, fan, and dehumidifier, to keep your house or office comfortable. 

With its Energy Star certification, you can save money on energy bills throughout the year. This window air conditioner has a 12 SEER rating, making it energy-efficient and eco-friendly.

The intuitive LED display and remote control make it easy to set time, temperature, and mode from across the room. You can program your temperature preferences for up to 24 hours with the built-in EasyTimer feature, making it even more energy-efficient. What’s more, the washable filter protects your family and living space from dust and pet hairs.

Overall, the Midea 12,000 BTU EasyCool Window Air Conditioner is a great option for those looking for an energy-efficient and customizable cooling solution. It is effortless to use due to its simple installation process and easy maintenance.

SEER: 12 | Cooling Power: 12,000 BTU | Energy Star: Yes | Floor Area: 550 sq. ft. | Special Feature: Remote control

Quick Comparison of AC for Sliding/Casement Windows

Casement Window ACsSEERCooling PowerEnergy StarFloor AreaSpecial Feature
Frigidaire10.410,000 BTUNo450 sq. ft.Remote control
Perfect Aire1310,000 BTUNo450 sq. ft.Remote control
Frigidaire FFRE063WAE12.26,000 BTUYes250 sq. ft.Dehumidifier
GE Window AC2.65,000 BTUNo150 sq. ft.Easy installation
LG Mounted AC138,000 BTUYes350 sq. ft.Remote control and energy-saving capabilities
Keystone12.26,000 BTUYes/No250 sq. ft.Dehumidifier
Midea EasyCool1212,000 BTUYes550 sq. ft.Remote control

Buying Guide for the Best Air Conditioner for Casement Windows

If you have casement windows or sliding windows in your home, finding window AC units that fit can be challenging. Luckily, there are several casement air conditioners on the market that are specifically designed for these types of window units. Here are some factors to consider when choosing a portable unit for your sliding windows:

Cooling Power

Look for a casement air conditioner with enough cooling power to cool your space effectively. This tells you the amount of heat the AC can extract out of a room. It's crucial to choose the right BTU unit for your room size. For small to medium-sized rooms (150-300 sq. ft.), a lower BTU unit will be sufficient, while higher BTU units can cool larger rooms more efficiently.

A good rule of thumb is to choose an air conditioner with a cooling capacity of at least 8000 British Thermal Units (BTUs) for spaces up to 350 square feet and at least 10,000 BTUs for spaces up to 450 square feet. Airflow and humidity control are also important considerations for selecting an air conditioner, as they can impact the effectiveness of the unit.

Choosing a casement window AC unit that's too small for your room can result in poor cooling performance, as the unit will have to work harder to cool the area. This leads to higher energy bills and potentially decreased lifespan of the unit.

On the other hand, choosing a casement window air conditioner that's too large for your window frame can lead to unnecessary energy consumption and increased costs. So, it's essential to choose the right size air conditioner for your space to ensure efficient and effective cooling.

Special Features

When it comes to special features, it's essential to consider what will make your life easier and more comfortable. For example, a dehumidifier can be a useful addition to an air conditioner, especially if you live in a humid climate.

If you live in a humid climate, dehumidifying capacity is also an important consideration. This is the amount of moisture an AC can remove from the air. Higher dehumidifying capacity can improve indoor air quality and reduce the risk of mold and mildew growth. However, if you live in a drier climate, a lower dehumidifying capacity may be sufficient.

A programmable timer can be particularly helpful if you want to save energy by only running your air conditioner during certain times of the day or night. Some casement window air conditioners also come with washable or removable filters that can be easily removed and cleaned.

Consider additional features that can enhance your experience, such as remote control, programmable thermostat, air purifier, and quiet mode. These features may increase the unit's price, but they can also improve comfort and convenience. Units without additional features may be more affordable, but they lack convenience and comfort.

Ultimately, the special features you choose will depend on your personal preferences and needs. Consider how you will use your portable air conditioner and choose a model with features that will make your experience more comfortable and convenient.

Energy Efficiency

Air conditioners can use a lot of energy, so it's important to choose an energy-efficient model. The Seasonal Energy Efficiency Ratio (SEER) measures the ratio of cooling power to energy consumption. Higher SEER means lower energy consumption. Higher EER units are generally more energy-efficient but may come with a higher price tag. Lower EER units may be more affordable, but they may consume more energy.

The best casement window air conditioners are Energy Star certified and are designed to use up to 10% less energy than a standard window air conditioner. Efficient energy use is an important factor to consider when selecting an air conditioner brand for your sliding or casement window, as it can help to reduce energy bills and conserve resources.

In addition to energy certification, there are other ways to improve your AC's energy efficiency. For example, keeping the filter clean and replacing it regularly can help your AC run more efficiently. You can also use a programmable thermostat to set your AC to turn on and off at specific times, which can help you save energy when you're not home.

Noise Level

The noise level of a casement window air conditioner can be a significant factor, especially if you're planning to use it in your bedroom or office. Look for air conditioners with noise levels of 60 dB or lower. To put that into perspective, a typical conversation is around 60 dB, while a vacuum cleaner is around 70 dB.

Quieter units are generally more expensive but can provide a more comfortable living environment. On the other hand, noisier units may be more affordable but can disrupt your daily activities. Some casement window air conditioners offer a "quiet mode" or "sleep mode" that can help reduce noise levels further, making them a better option for use in bedrooms or other quiet spaces.

Keep in mind that the noise level can also depend on the size and placement of your casement air conditioner. Slider and sash window dimensions should be measured to ensure a proper fit for your air conditioner. Amazon provides a vast selection of heating, ventilation, and air conditioning products. When selecting an HVAC unit, consider the dimensions of your space in inches, as well as the necessary hoses, brackets, and hinges.

The compressor and manufacturing quality should also be evaluated for optimal performance. Proper wall measurements and information on materials, such as Poly(methyl methacrylate), can also be important.

By considering these factors, you can choose a window air conditioner that is specifically designed for your sliding windows and that meets your cooling needs and preferences.

What is a sliding or casement window air conditioner?

A sliding or casement window air conditioner is an air conditioning unit specifically designed to fit into sliding or casement windows. These air conditioners are typically tall and narrow and are designed to be installed vertically.

What are the advantages of using a sliding window air conditioner?

The advantages of using a sliding window air conditioner are ease of installation, space-saving design, and energy efficiency.

It is recommended to choose a sliding window air conditioner with a cooling capacity of at least 8000 BTU for spaces up to 350 square feet and at least 10,000 BTU for spaces up to 450 square feet.

Can I install a casement window air conditioner myself, or do I need professional installation?

Yes, a casement window air conditioner can be installed by yourself, but professional installation is recommended for safety.

How do I clean and maintain my sliding window air conditioner?

To clean and maintain your sliding window air conditioner, regularly clean the filter and unit and schedule professional maintenance annually.

Can a sliding or casement window air conditioner be used in other types of windows?

They are designed specifically for sliding windows and may not fit other types of windows.

Can a sliding or casement window air conditioner be used in a room with high ceilings?

Sliding or casement window air conditioners can be used in rooms with high ceilings but may not effectively cool the entire room.

How noisy are casement window AC units and vertical window air conditioner units, and can they be made quieter?

Sliding and casement window air conditioners can vary in noise level, but some models have a sleep or quiet mode option to reduce noise.

How energy-efficient are sliding and casement window air conditioners compared to other types of air conditioners?

Sliding and casement window air conditioners can be energy-efficient when properly sized and maintained but may not be as efficient as other types of air conditioners, such as central air conditioning, ductless mini-split systems, or a traditional window unit.


Making a choice for the best air conditioner for casement windows can be challenging, considering the variety of features and specifications to look out for. However, this guide has focused on the best air conditioners that have been shown to deliver cooling efficiency, functionality, and convenience for casement windows.

From the above 7 best air conditioners for casement windows, here are the top three expert recommendations:

Firstly, the FRIGIDAIRE FFRS1022R1, with its dehumidifying function and multiple user-friendly features, is an ideal option for those with small spaces needing a cooling solution. Though lacking in Energy Star certification, it makes up for that with its 10,000 BTU of cooling power and easy installation.

The second pick, PERFECT AIRE, offers uniform air distribution with its full-range air direction control, making it a good option for cooling rooms up to 450 sq ft. The energy-saving features and handy filter slide-out access make it a practical and user-friendly choice.

Lastly, the FRIGIDAIRE FFRE063WAE with its Energy-star certification stands out as the right choice for energy-conscious users demanding a multi-speed fan and programmable timer. The inclusion of a sleep mode for added comfort, an easy-to-clean washable filter, and remote control for convenience are additional features that stand out.

Overall, all these air conditioners bring their own advantages, and the best casement window air conditioner choice ultimately depends on your specific needs and preferences. Don't forget to consider soundproofing as well, which can enhance your home's comfort. Learn more about this aspect by checking out our article How to Soundproof Windows: 13 Easy Methods That Work.

With that said, the models outlined above have all earned a strong reputation for their performance and convenience and are worthy of consideration for anyone in the market for a new air conditioner.