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sliding window air conditioner

10 Best Casement & Sliding Window Air Conditioners 2022: Vertical AC Units Reviewed

Looking for a good casement sliding window air conditioner? 

Take a look at our top 10 picks below.

A sliding or casement air conditioner is your best bet for vertical windows. 

Fortunately, there is no shortage of styles and options in this range. 

In this buying guide, we review and compare the 10 best casement sliding window air conditioners sold today, most of them online. We also provide a brief buying guide to help you find the right unit for your home or office.

What is a Casement/Sliding-Window AC?

A casement/sliding window AC is a self-contained air conditioning system inside a vertical cabinet.

They are designed to mount on a narrow casement or sliding windows that cannot house a regular horizontal window AC.

While casement and sliding window ACs are the two standard terms used to refer to these units, these are not the only names.

These include vertical window AC, crank window AC, slider window AC, sliding window AC, thin AC, and sometimes tilting window AC.

These terms point to the same type of air conditioner, so any product with these terms is the one you are looking for. 

What's in This Guide


Best Casement & Sliding Window Air Conditioners 

Disclamer: All links below go to Amazon.com

  1. 1
    Best Overall Casement/Sliding Window AC: Frigidaire FFRS0822S1
  2. 2
    Runner-Up: PerfectAire 3PASC10000 Window AC
  3. 3
    Best for Small Rooms: Koldfront CAC8000W
  4. 4
    Best for Medium Size Rooms: Frigidaire FFRS1022R1 
  5. 5
    Best for Large Rooms: Whynter ARC-14S 
  6. 6
    Best Vertical AC + Heater Combo: Whynter Elite ARC-122DHP 
  7. 7
    Best Budget Budget Sliding Window AC: Global Industrial 
  8. 8
    Best Features: Serenelife SLPAC10
  9. 9
    Vertical Window Air Conditioner for Small Rooms: Black + Decker BPACT08WT
  10. 10
    Best Wi-Fi-Connected AC: Rollibot ROLLICOOL 

sliding window air conditioner
  • Frigidaire FFRS0822S1

  • Best Overall
  • Dimensions
    23.5 x 14.2 x 20.2 inches

  • Weight
    66 pounds

  • Coverage Area
    350 Square feet

  • BTUs
    8,000

  • Fan Speeds
    3

casement window air conditioner
  • PerfectAire 3PASC10000 Window AC

  • Runner-up
  • Dimensions
    23.5 x 14.75 x 21 inches

  • Weight
    72 Pounds

  • Coverage Area
    400-450 Square feet

  • BTUs
    10,000

  • Fan Speeds
    3

casement window air conditioner
  • Koldfront CAC8000W Casement/Sliding Window Air Conditioner

  • Best for Small Rooms
  • Dimensions
    23.5 x 14.5 x 20.88 inches

  • Weight
    75 Pounds

  • Coverage Area
    300 to 350 square feet

  • BTUs
    8,000

  • Fan Speeds
    3

sliding window air conditioner
  • Frigidaire FFRS1022R1 Casement/Sliding Window Air Conditioner

  • Best for Medium Rooms
  • Dimensions
    23.5 x 14.5 x 20.25 inches

  • Weight
    72 pounds

  • Coverage Area
    Up to 450

  • BTUs
    10,000

  • Fan Speeds
    3

casement window air conditioner
  • Whynter ARC-14S Vertical/Sliding Window Air Conditioner

  • Best for Large Rooms
  • Dimensions
    16 x 19 x 35.5 inches

  • Weight
    80 Pounds

  • Coverage Area
    500 square feet

  • BTUs
    9,500

  • Fan Speeds
    3


casement window air conditioner
  • Whynter Elite ARC-122DHP Vertical/Sliding Window Air Conditioner

  • Best Vertical AC + Heater Combo
  • Dimensions
    16.5 x 20 x 34 inches

  • Weight
    71 Pounds

  • Coverage Area
    400 Square feet

  • BTUs
    7,900

  • Fan Speeds
    3

sliding window air conditioner
  • Global Industrial Casement Window Air Conditioner

  • Best Budget Sliding Window AC
  • Dimensions
    23.5 x 14.63 x 20.88 inches

  • Weight
    85 Pounds

  • Coverage Area
    450 Square feet

  • BTUs
    10,000

  • Fan Speeds
    3

casement window air conditioner
  • Serenelife SLPAC10

  • Best Features
  • Dimensions
    13.39 x 32.09 x 17.45 inches

  • Weight
    65 pounds

  • Coverage Area
    400 Square Feet

  • BTUs
    10,000

  • Fan Speeds
    3

sliding window air conditioner
  • Black + Decker BPACT08WT

  • Vertical Window Air Conditioner for Small Rooms
  • Dimensions
    16.5 x 11.5 x 26 inches

  • Weight
    52.9 Pounds

  • Coverage Area
    150 square feet

  • BTUs
    4,000

  • Fan Speeds
    3

casement window air conditioner
  • Rollibot ROLLICOOL Vertical/Sliding Window AC

  • Best Wi-Fi-Connected AC
  • Dimensions
    18.9 x 14.9 x 30.5 inches

  • Weight
    70 Pounds

  • Coverage Area
    375 square feet

  • BTUs
    14,000

  • Fan Speeds
    3


1. Best Overall: Frigidaire FFRS0822S1

sliding window air conditioner

The FFRS0822S1 is one of the best casement/sliding window AC because of its powerful and efficient performance. It can produce up to 8,000 cooling BTUs per hour, making it suitable for 350 square feet rooms.

Pros

  • Simple and easy to use.
  • Comes with a feature-full remote.
  • Multiple operation modes.
  • Exhaust switch.
  • Multi-directional vents.

Cons

  • Assembly instructions are confusing.
  • Loud.

Our Review

Best Features

Room size and BTUs

The Frigidaire FFRS0822S1 is a medium-sized unit. It generates up to 8,000 cooling BTUs per hour. It is suitable for small to medium-sized rooms measuring 350 square feet. 

Exhaust Switch

Another convenient feature in this device is an exhaust slider switch. Using it, you can control the flow of fresh air into your room. 

Sleep Mode

Not many window ACs support sleep mode operation, yet this unit does. When you turn on the sleep mode, the FFRS0822S1 gradually increases the temperature by a few degrees to ensure a comfortable sleeping environment. 

Limitations and Issues 

Despite being a solid product from a reputable manufacturer, the Frigidaire FFRS0822S1 comes with lousy assembly instructions. The font is pretty small to make out, and the instructions are hard to follow. 

Specs

Dimensions: 23.5 x 14.2 x 20.2 inches

Weight: 66 Pounds

Cooling BTUs: 8,000

Coverage Area: 350 square feet 

Operation Modes: Cooling, Energy Saver, Sleep, and Fan only modes 

Control Options: Remote and touch-sensitive keys 


casement window air conditioner

The PerfectAire 3PASC10000 Window AC is another solid option for you to check out.

It has a high area coverage of 450 square feet. It can run on various modes and multiple fan speeds to ensure optimum cooling performance. 

Pros

  • High cooling output.
  • Comes with an expandable mounting kit.
  • Washable and easy to access filter.
  • Mobile thermostat technology for total room coverage.
  • Multiple fan speeds. 

Cons

  • Heavy
  • Noisy 

Our Review 

Best Features

Multiple Operating Modes 

We like this unit for its wide range of operating modes. You can choose to operate it on auto mode for automatic temperature regulation, sleep mode for when you sleep, dry for dehumidification only, and energy saver mode for keeping your energy bills in check. 

Follow Me Portable Thermostat 

A good thing about this casement window AC is the inclusion of a portable thermostat inside the remote. Once turned on, the AC senses where the remote is and cools that area more efficiently. 

BTUs and Room Size 

This is a powerful device with stable cooling output. It generates up to 10,000 BTUs per hour, making it suitable for most medium-sized rooms measuring 450 sq. ft. 

Limitations and Issues 

Other than the shipping-related damage, the only complaints are its weight and sound output. At 72 pounds, it is heavy to lift alone. The noise level at the highest speed is also a bit loud. 

Specs

Dimensions: 23.5 x 14.75 x 21 inches

Weight: 72 Pounds

Cooling BTUs: 10,000

Coverage Area: Up to 450 square feet 

Operation Modes: Auto, Sleep, Dry, and Energy Saver Modes 

Control Options: Remote and soft keys 


sliding window air conditioner

The CAC8000W Casement/Sliding Window Air Conditioner from Koldfront is also a good choice for cooling small to medium areas. 

It produces 8,000 BTUs to cool medium-sized rooms up to 350 square feet in size. 

This unit also comes complete with all the installation accessories and hardware to facilitate the mounting process. 

Pros

  • Simple and easy to use.
  • Includes all the mounting accessories.
  • Feature-rich remote control.
  • Sleep mode. 
  • Exhaust switch.

Cons

  • Heavy.
  • Expensive. 

Our Review

Best Features

Room size and BTU Output

The Koldfront CAC8000W is designed to cool down rooms measuring 350 square feet. It generates up to 8,000 BTUs of cooling energy that evenly spreads around the room to cool it effectively. 

Control Options

This AC supports dual operation modes. It has touch-sensitive buttons across the top that let you adjust its settings. But if you want to operate it from a distance, the included remote control has all the buttons to adjust its various settings. 

Complete Window Kit

Nobody likes shopping for additional accessories to mount their window AC. Fortunately, the CAC8000W comes with a complete window kit with all the hardware and accessories for easy installation. 

Limitations and Issues 

Despite being one of the smaller casement AC options, this unit has a higher upfront cost. Plus, at 75 pounds, it is also one of the heavier units on our list. 

Specs

Dimensions: 23.5 x 14.5 x 20.88 inches

Weight: 75 Pounds

Cooling BTUs: 8,000

Coverage Area: 350 square feet 

Operation Modes: Cooling, Energy Saver, Sleep, Dry, and Fan only modes 

Control Options: Remote and touch-sensitive keys 


casement window air conditioner

This unit from Frigidaire is a suitable choice for most medium-sized rooms.

It produces up to 10,000 cooling BTUs and has a dehumidification capacity removing around 3.4 pints of moisture per hour. 

Pros

  • Simple and easy to operate.
  • It is equipped with an exhaust switch.
  • Multiple operation modes.
  • Three fan speeds.
  • Full-function remote control.

Cons

  • Heavy.
  • Small display. 

Our Review 

Best Features

Room Size and BTU Output

This unit is a suitable choice for buyers looking for an AC to cool down a medium-sized room. It can cover areas up to 450 square feet with its powerful 10,000 BTU output. 

High Dehumidification Capacity

Despite being an AC, this unit boasts a high dehumidifying capacity. It can extract up to 3.4 pints of excess moisture from the air, making it dry and easier to breathe in. 

Multiple Fan Speeds 

A good thing about this unit's adjustable fan speed is its convenience. You can set it to run on low, medium, or high speeds.

There is also an auto speed mode that adjusts the fan speed automatically according to the desired temperature. 

Limitations and Issues 

The unit’s main disadvantage is its weight and hard-to-read display. You might face difficulty reading the display and the accompanying buttons, especially in low-light conditions. 

Specs

Dimensions: 23.5 x 14.5 x 20.25 inches

Weight: 72 pounds

Cooling BTUs: 10,000

Coverage Area: 450 square feet 

Operation Modes: Cooling, Energy Saver, Sleep, Dry, and Fan only modes 

Control Options: Remote and soft keys


sliding window air conditioner

The Whynter ARC-14S Vertical/Sliding Window Air Conditioner is a powerful portable AC that you can use to cool down the larger areas of your home.

Being portable in design, you can use it in various parts of your room. It can produce up to 9,500 BTUs that can cool areas up to 500 square feet. 

Pros

  • Portable and easy to move around.
  • Simple and easy to control.
  • Dual hose design.
  • Does not require permanent installation.
  • Available in two color options. 

Cons

  • Intake and exhaust hoses are too close together.
  • Noisy.

Our Review

Best Features

Portability 

One of the best features of this device is its portability. It does not support permanent installation, so you can use it wherever you please. It is equipped with caster wheels for easy mobility.

Dehumidification

Another noteworthy feature of this Whynter device is its high dehumidifying capacity. The unit can remove as much as 71 pints of moisture per day. 

Dual Hose Operation 

Unlike other portable ACs available on the market, Whynter uses a dual hose design to conduct its operation. The intake hose brings in the outside air while the exhaust hose expels the evaporated moisture outside. 

Limitations and Issues 

The only issue with this unit is that the intake and exhaust hoses are so close together that some of the hot air exhausted outside can find its way back indoors. 

Specs

Dimensions: 16 x 19 x 35.5 inches

Weight: 80 Pounds

Cooling BTUs: 9,500

Coverage Area: 500 square feet 

Operation Modes: Air Conditioner, Dehumidifier, and Fan modes 

Control Options: Remote and Digital Controls 


sliding window air conditioner

The Whynter Elite ARC-122DHP Vertical/Sliding Window Air Conditioner is a solid option for anyone looking to purchase a dual operation unit. This AC not only cools but also provides supplemental heating when required. 

Pros

  • Heat and cool modes.
  • Eco-friendly, CFC-free refrigerant.
  • Portable design.
  • Grooves and wheels ease transportation.
  • Comes with a storage bag.

Cons

  • The window kit could be better.
  • The drain plug is very low. 

Our Review 

Best Features

Dual Function

Not only does this AC cool your room during colder months, but you can also heat your room with it. The dual-function guarantees year-round usage with its heating and cooling capacity. 

Portable Design

It also stands out because of its portable design. You can quickly move the unit from room to room and use the versatile window kit to set it up anywhere you please. 

Limitations and Issues 

The two issues vastly associated with this unit are the window kit and the drain plug placement. The window kit does not cover the window entirely. Plus, there is no insulation to seal gaps.

Some users also report that the drain plug of the unit is located so low that it is challenging to drain it quickly. 

Specs

Dimensions: 16.5 x 20 x 34 inches

Weight: 71 Pounds

Cooling BTUs: 7,900

Coverage Area: 400 square feet 

Operation Modes: Cooling, Heating, Dry, and Fan only modes 

Control Options: Remote and touch-sensitive keys 


sliding window air conditioner

The Global Industrial Casement Window Air Conditioner is a budget-friendly option. It is a medium-sized device capable of producing 10,000 cooling BTUs for 450 sq. ft. rooms. 

Pros

  • Suitable for small to medium-sized rooms.
  • Affordable.
  • User-friendly interface.
  • Remote control included.
  • Washable filter. 

Cons

  • Setting the timer is difficult.
  • Dubious warranty. 

Our Review

Best Features

Easy Access Filter 

The air filter on this unit is super straightforward to clean and maintain. Just slip it out from beneath the control panel. Wash, dry, and reinsert to let it go back to collecting the debris efficiently.

Coverage Area and BTUs

This unit is a suitable contender for cooling most medium-sized rooms with its modest output. It produces about 10,000 BTUs per hour evenly throughout the room. You can use it to cool rooms up to 450 square feet in size. 

Limitations and Issues 

This AC has fantastic customer feedback backing it up. The only problem most buyers have is with its timer function, which they say is difficult to program. 

Specs

Dimensions: 23.5 x 14.63 x 20.88 inches

Weight: 85 Pounds

Cooling BTUs: 10,000

Coverage Area: 450 square feet 

Operation Modes: Cooling, Energy Saver, Sleep, and Fan only modes 

Control Options: Remote and touch-sensitive keys 


8. Most Innovative Features: Serenelife SLPAC10

casement window air conditioner

The Serenelife SLPAC10 is a reliable air cooling unit for those interested in benefiting from innovative features. This lightweight and quiet model produces 10,000 BTUs for a 400 sq. ft. room.

Pros

  • Portable.
  • Lightweight.
  • Digital Touch Button Control Panel with display.
  • Quiet.
  • Sleek and stylish. 

Cons

  • Window kit does not fit small windows.
  • The Ventilator heats up.

Our Review 

Best Features

Lightweight and Portable 

The Serenelife SLPAC10 features a sleek and stylish design that is highly portable and lightweight.

It measures 65 pounds in weight, but the built-in wheels make it easier for you to move it around. It does not require fixed installation so that it can be used all over your home.

Multiple Operating Modes 

This device is not just an AC. It doubles up as a dehumidifier and a fan too. You can use the dehumidification function with or without cooling, removing up to 1.5 liters of moisture per hour. The fan function simply circulates the air without cooling. 

Limitations and Issues 

The most common complaint we encountered with this unit is the window kit.

Users say that even though the kit is expandable, it fits more oversized windows. You will need to cut off some casing parts to fit it in a smaller window. 

Specs

Dimensions: 13.39 x 32.09 x 17.45 inches

Weight: 65 Pounds

Cooling BTUs: 10,000

Coverage Area: 400 square feet

Operation Modes: Cooling, Energy Saver, Sleep, Dry, and Fan only modes

Control Options: Remote and Digital Touch Button Control Panel


9. Most Portable: Black + Decker BPACT08WT

sliding window air conditioner

This vertical window AC from Black and Decker is equipped with rolling caster wheels for easy transportation. You can use it to cool small-sized rooms measuring up to 150 square feet. 

Pros

  • Simple and easy to set up.
  • Lightweight and portable.
  • Adjustable fan speed.
  • Top-mounted LED display.
  • User-friendly remote. 

Cons

  • Small area coverage.
  • Can develop problems with water draining.

Our Review

Best Features

BTUs and Area Coverage 

This portable AC is best suited for smaller rooms. It produces about 4,000 cooling BTUs that can cover 150 square feet. You can use it to cool down the smaller areas of your house like the kitchen, closet, office, etc. 

Expandable Window Kit 

The Black and Decker BPACT08WT comes with an expandable window kit. It is easy to set up and can be used with wide and narrow windows. It is also possible to set it up with a sliding door. 

Limitations and Issues 

Though this Black and Decker unit is a solid performer, it can develop issues with water draining if not appropriately maintained. 

Specs

Dimensions: 16.5 x 11.5 x 26 inches

Weight: 52.9 Pounds

Cooling BTUs: 4,000

Coverage Area: 150 square feet

Operation Modes: Cooling, Dry, and Fan only modes

Control Options: Remote and Digital control panel


casement window air conditioner

Want a vertical window AC that you can integrate into your smart home system?

This Wi-Fi-enabled AC by Rollibot will let you do just that. It will provide you with the best dehumidification and cooling for a comfortable room environment.

Pros

  • Portable.
  • Wi-Fi Enabled.
  • High dehumidification capacity.
  • Supports voice commands.
  • Noiseless.

Cons

  • The window kit is difficult to set up.
  • Draining in an external container can be a problem. 

Our Review 

Best Features

Wi-Fi Connectivity 

This feature sets this Rollibot unit apart. Using this function, you can operate the unit with voice commands and mobile phone applications. Simply sync it with your home assistant and use it with your voice. 

High Dehumidification Capacity 

This unit doubles up as a powerful dehumidifier. It can remove up to 70 liters per day, providing you with fresher air that is easy to breathe in. 

Limitations and Issues

Despite being an efficient and smart unit, it comes with a clumsy window kit that makes its setup quite tricky. 

Specs

Dimensions: 18.9 x 14.9 x 30.5 inches

Weight: 70 Pounds

Cooling BTUs: 14,000

Coverage Area: 375 square feet

Operation Modes: Cooling, Dry, and Fan only modes

Control Options: LED touchscreen, Mobile phone application, and voice commands


Buying Guide: Casement & Sliding Window ACs

casement window air conditioner

Sizing A Casement and Sliding Window AC

Two factors come into play when sizing a casement and sliding window AC - room size and window size.

If you end up selecting a unit that is even a half-inch big, it will not fit through your window. So, measure your window's dimensions carefully and choose a suitable model.

Your next concern is the room size. The bigger your room, the more powerful your AC should be. Most vertical ACs can put out between 5,000 to 12,000 BTUs. 

A 5,000 BTU unit is suitable for rooms up to 150 square feet, while a 12,000 BTU unit will efficiently cool areas as big as 550 square feet. Measure the area of your room and choose a unit with appropriate cooling coverage.

How Casement and Sliding Air Conditioners Work

A sliding or casement AC works the same way as any other air conditioning device. It consists of a thermostat, a fan, a compressor, a refrigerant, an evaporator coil, and a condenser coil.  

The thermostat determines when the room temperature is below the set limit and triggers the fan. The fan pulls in the hot, humid air from inside the room and passes it over the condenser coil. 

This cools the air down and condenses the moisture into water. The water is drained outside the unit via a drain plug.

Features That Matter

sliding window air conditioner

BTU's & Room Size

The higher the BTU output of an AC, the more area it cools. Sliding window ACs usually range from 5,000 to 12,000 BTU, covering between 150 and 550 square feet. 

The manufacturers list the BTU output and the suggested coverage area in the specification list of their product.

You should measure the size of the room you want to cool and choose a unit with comparable cooling output. 

Size of Unit vs. Size of Window

It is essential to match the size of the unit with the size of your window because a bigger unit will not fit through, and a smaller one will need lots of insulation to create an efficient barrier. 

Installation Kit

Purchasing a casement AC with a complete installation kit eases the installation process. 

If you don't want to be bothered with professional installation, be sure to invest in a model that contains one of these. 

Dual Function (Heat + Cool)

While this function is very rare in slider AC models, having one of these allows you to use the unit throughout the year to keep you cool in summers and cozy during winters. 

Noise Level

Compared to their traditional models, the modern casement ACs made these days are relatively quiet. They emit about 40 to 55 decibels of noise at various speed settings. 

However, if you are a light sleeper or have noise tolerance issues, you should look for a model with an even lower noise output. 

Fan Speeds

ACs that can operate on multiple fan speeds give you better control over their operation. You can increase or decrease their speed according to your preference. This makes them immensely flexible to operate. 

Energy-Saver Mode

Manufacturers have thoughtfully incorporated an energy-saving mode of operation in their devices. It ensures effective cooling performance with minimal energy consumption. 

You should prioritize this feature amongst others because of the savings it brings in the long run. 

Exhaust Switch

The exhaust switch is a slider found in some vertical ACs which allows air to vent from inside your home to the outside.

If you keep it open, the air inside your room will be replaced with fresh air from outside. And if kept closed, the unit will keep circulating the same indoor air.

If you like having fresh air inside, make sure the AC you purchase has an exhaust switch. 

Dehumidifier Mode

The dry or dehumidifier mode allows the AC to remove excess moisture from the air without cooling it. This feature is a staple in almost all ACs. 

Remote Control

sliding window air conditioner

Having a remote control to operate the AC gives you the freedom to adjust its settings from a distance.

If you are getting a sliding window AC for a large room, consider the models that come with a remote so that there is no need to get up every time you want to adjust the temperature slightly. 

WiFi Connectivity

An AC with Wi-Fi connectivity opens a whole new world of convenience. Such units can be integrated into your smart home network, allowing you to control them using voice commands.

Or you can also operate them remotely even when you are not inside the house via the compatible smartphone app. 

If such convenience is your priority, purchase a Wi-Fi-enabled casement window AC. 

Programmability & Timers

This function also provides convenience as you can arrange for the AC to turn on or off according to your daily routine. This ensures efficient usage of the product.


Installing A Sliding/Casement Window Air Conditioner

sliding window air conditioner

A casement window AC is supported on the outside by a platform assembly that you install on the house siding.

At the same time, the front rests on a wood support base placed over your window sill. Here's how you can install one:

  • The first thing you have to do is install the wooden base. You can craft one yourself and place it securely over your windowsill.
  • Next, install the including mounting platform onto the wooden base.
  • Open the window.
  • Ask a partner to help you lift the AC and push it through the window opening and onto the platform assembly. 
  • Close the window making sure it presses against the sash that holds the unit in place.
  • Now take some clear acrylic or particleboard to fill the open space on top of the unit.
  • Use some pieces of wood or foam to fill in the gaps. Apply some sealant to create a tight seal.

Properly Ventilating a Window AC 

Ventilating an air conditioner is essential to maintain efficient performance. Fortunately, casement and sliding window ACs come as a single unit and inner ventilation system. 

Once you correctly install the unit, the exhaust faces outside. Now, it will automatically ventilate itself outside whenever you turn on the unit. 


Casement/Vertical AC Maintenance

casement window air conditioner

A casement window AC may not require professional attention as a central system. But that also does not mean it is completely maintenance-free.

You need to give it some tender loving care to preserve its optimum performance. Here's what you should do:

Check and clean the filter regularly 

Vertical air conditioners are equipped with air filters to trap dust particles and hair. When they become clogged, the airflow to the unit drops, making its performance suffer. 

Most of these filters are washable, so you can easily remove and clean them when they become clogged. Some units also feature a check filter light that lets you know when to clean the filter. 

Care for the fins

An AC operates over two coils - the evaporator coil towards the room and the condenser coil towards the outside. They are covered with delicate aluminum fins to capture and release the heat. 

These fins get covered in dust or become bent over time, so it's essential to clean and straighten them. You can do so after uninstalling the unit. Take a soft bristle brush and move in line with the fins. 

To straighten them, take an expired credit card and insert it into a gap where fins are not bent. Run it down the gap until you pass through the bent section. After several passes, the fins will go back to their original position. 

Clean the fans and condensate pan

The fans inside your unit also collect dust. You can wash these fans safely using mild detergent and water. 

It is also essential to wash the condensate pan because the moist environment is a perfect breeding ground for microbes

Put away when not in use 

Though you may be tempted to keep the heavy unit permanently installed, taking it out and storing it away during colder months increases its lifespan. 


Frequently Asked Questions

sliding window air conditioner

Is there a window air conditioner for casement windows?

Yes, there is, but the range is not as wide as other types of air conditioners. Very few brands make casement window air conditioners, but there are some well-known models that you can choose from. 

Do they make window AC units for sliding windows?

Yes, they do make window ACs for sliding windows. At the same time, there are several window air conditioners on the market that can retrofit into sliding windows.

And if you want one specifically for a sliding window, there is no shortage of options either. 

Do they make a 12,000 BTU casement window air conditioner?

Yes, they do make 12,000 BTU casement window ACs. You can check out the product lineup of famous names like Frigidaire to find one for yourself. 

How do you install a portable air conditioner in a casement crank window?

For this purpose, you will need a plexiglass insert. Measure the window to know the size and have a hardware store cut it for you.

Also, make them cut a hole in the center to fit your AC's vent hose. Once you have the glass, open the window and secure the insert using twist clamps.

Now caulk the areas where the casing and window frame meet to seal them. Once sealed, attach your exhaust hose into the insert and enjoy extraordinary air output from your portable AC. 

How do you install an air conditioner in a vertical sliding window?

Installing an air conditioner in a vertical sliding window is an easy enough task.

All you need to do is attach the mounting brackets and sleeve to the window sill, slide your unit through the window, and secure it to the brackets using screws.

Next, you have to take care of the gap. Most window ACs come with an extendable plastic curtain that you can fit neatly into the panels. Drawing this curtain close will prevent cool air from seeping out. 

How does a casement window air conditioner work?

A casement window air conditioner works on the same principle as any other cooling device.

It pulls the hot, humid air from the room and uses a refrigerant to remove the heat and humidity. During this process, it also cools this air down before circulating it back into the room. 


Final Verdict: What is the Best Casement & Sliding Window Air Conditioner?

After carefully assessing the various units available on the market, we believe the Frigidaire FFRS0822S1 is the best sliding or casement window AC for most homes. It produces 8,000 BTUs and can easily cover 350 square feet. 

If you need something more powerful, go for the PerfectAire 3PASC10000 Window AC. It generates 10,000 cooling BTUs and is suitable for areas as big as 450 square feet. 

Lastly, if you prefer a WiFi-connected vertical unit, the Rollibot ROLLICOOL Vertical/Sliding Window AC with Wi-Fi connectivity offers a powerful 14,000 BTU output enough to cool a large living room or master bedroom of up to 400 square feet. 

About the Author Tom Hanson

I’ve worked as an HVAC tech in Phoenix, AZ for the past 10 years. I created CoolAndPortable.com to help home owners select the right portable air conditioner, cooler or air purifier for their needs & budget in just a few minutes.

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