Best Casement & Vertical Window Air Conditioners

When you move into a new apartment with windows that open outward or inward, you most likely have a sliding or casement window. They function similarly to doors, except that they open with a crank instead of a handle.

We have found our top 3 picks if you’re here for the best vertical and casement window air conditioner product recommendations. These are all great products, assuming they fit the casement and window they are put into. They help avoid breaking the bank in the process.

Midea 12,000 BTU EasyCool Window Air Conditioner, Dehumidifier and Fan - Cool, Circulate and Dehumidify up to 550 Sq. Ft., Reusable Filter, Remote Control
Koldfront CAC8000W 8000 BTU 115V Casement Air Conditioner with Dehumidifier and Remote Control
TCL 5WR1-A Home Series Window-air-Conditioner, 5,000 BTU, White
What we love
Extremely quiet and great value for money with this model.
Energy Star-certified, for windows from 15½ to 16.25 inches wide
Best slim, small, vertical window AC.
21.89 x 18.98 x 14.65 inches
23.5 x 14.5 x 20.88 inches
15.2 x 15.98 x 12.52 inches
12,000 BTU
8,000 - 10,000 BTU
5,000 - 10,000 BTU
Midea 12,000 BTU EasyCool Window Air Conditioner, Dehumidifier and Fan - Cool, Circulate and Dehumidify up to 550 Sq. Ft., Reusable Filter, Remote Control
What we love
Extremely quiet and great value for money with this model.
21.89 x 18.98 x 14.65 inches
12,000 BTU
Koldfront CAC8000W 8000 BTU 115V Casement Air Conditioner with Dehumidifier and Remote Control
What we love
Energy Star-certified, for windows from 15½ to 16.25 inches wide
23.5 x 14.5 x 20.88 inches
8,000 - 10,000 BTU
TCL 5WR1-A Home Series Window-air-Conditioner, 5,000 BTU, White
What we love
Best slim, small, vertical window AC.
15.2 x 15.98 x 12.52 inches
5,000 - 10,000 BTU

The only limitation of this type is that it is hard to put an air conditioner unit that fits into its narrow opening. You will want to make sure that you’re getting a product that fits the space it’s meant to be put into.

It is undoubtedly challenging for homeowners to find one that best suits them. That is because the usual dimension of a standard AC unit is in width.

How can you beat the summer heat without these machines? And what kind do you need that fits well with casement frames?

Fortunately, some manufacturers offer casement and vertical air conditioning window units on the market today. For example, a Frigidaire FFRS 1022rl is generally one of the finest on the market.

If you want to know more about the best casement and vertical window air conditioners, read the entire post. We’ll cover your upright and small openings. We also have portable and sliding window options. You may know that you have a 14-inch wide clearing or installing it in the basement. Is the Frigidaire ffrs1022r1 right for you? Find out here!

Ready to explore the best vertical and casement window air conditioners for the money? Keep reading!

fuzzy dog and thermostat

What is a casement window air conditioner?

A casement window air conditioner is a high, narrow window air conditioner unit. They are the perfect cooling system to fit into a casement or sliding window arrangement. They’re set vertically into its narrow opening. One of the unique features of these units is that they are usually less than 20-30 inches high and 14-15 inches in maximum width. They come with a mounting kit to lock the unit in place.

Therefore, a vertical air conditioner is a perfect match for this configuration because they tend to be taller than wide.

Why should you get one?

Suppose you have a space that opens vertically or side to side. The best unit to install is the casement or slider model. The unit sits right in the open space of the windowsill that holds the unit in place with a mounting kit around the sides.

These models require very little setup. As a result, you will typically install it yourself. It means there is no additional expense. It is an excellent option for cooling one or two rooms and is very energy efficient.

All regular systems can pass through standard windows. All lightweight and narrow models are designed to fit casement and sliding windows. Therefore, they all have assembly kits and attachments to block the excess air passage.

To send you a quick overview of the unit, I have collected details about how it operates and what we get from purchasing one.

  1. Most of the casement and vertical units have a power supply cord that features a current device. It detects any damage to the power cord when you plug it in. In addition, you can test the power supply by pressing the TEST and RESET buttons through this device. After successful testing, the power supply begins providing electricity to the unit.
  2. It has an energy-saving feature. It allows the device to operate until the temperature is reached and then shuts down automatically. Moreover, the unit works in an on-off mode until the desired temperature. You can set this function as a default operation on its first use.
  3. The temperature is automatically maintained anywhere between 60 to 90 degrees Celsius.
  4. Vertical units feature an operation that detects the temperature of the room automatically. When the room temperature increases rapidly, the fan switches to the maximum speed. And if the room temperature idles at a certain degree, the fan switches to the lowest rate. In other words, the fan’s speed will go along with the temperature of the room.
  5. In the relaxed mode, the fan runs continuously while the compressor cycles on and off. This mode will make the room temperature very comfortable stay.
  6. The best feature of a vertical unit is that it has an alert mode when the filter needs some cleaning. So the filter is monitored, and the LED light will constantly appear for a maximum of 250 hours. After then, you’ll need to clean the filter and reset the timer.
  7. Moving on, the exhaust feature enables the unit to recirculate indoor air or exhaust it to the outside. The “closed” position will initiate when optimum cooling is cozy enough. In contrast, the “open” position clears humid air from the room and releases it to the outside. Fresh air is then brought in from natural passages in the home.
  8. The slider window air conditioner can extract the air from the outside to the inside. It will go through the filter system and cooling mechanism, releasing fresh homely air into the room.
female adjusting thermostat

Those are the advanced features you will enjoy with these specific models. A valid reason why you need to install a sliding window unit in your home today.

What to look for

Nothing will beat an air conditioner on a humid day for bringing coziness to your house.

What to look for
Cooling capacityDimensionsWeight
Energy-efficiencyManufacturerNoise level

Today, the market is full of fresh and modern units with unique value and features. Some include things such as LED digital displays and more.

They are also jam-packed with remarkable features and functionalities that will be perfect for your need for an air conditioner. Some units are easy to configure and require only light maintenance operation. They’re just the best all-rounder appliance for your home. I guess we are lucky to have all of that.

Before purchasing or installing a vertical unit, you want to know what to look for.

  • The cooling capacity

The primary function of these machines is to provide coolness to your house. The cooling effect is calculated in BTUs or British Thermal Units. The more space there is in a room, the more cooling capacity you need to make it cozy.

A 10,000 BTU unit has enough cooling ability to cool areas up to 450 square feet. Therefore, it is the most sought-after cooling capacity for a casement AC.

  • Dimensions of the unit to match the space

Before making that purchase, ensure the precise dimensions of your casement to ensure that you get the correct vertical model.

Customarily, its width should be between 20 to 25 inches. That means the suited casement unit must be at least 15 ½ inches. Now, take note that the size of the installation kit adds an inch to the total width. That is why it is not ideal for putting an AC that is just right for the window. Always allow space for certain parts of the installation.

  • The weight

The average weight of a vertical unit is 63 lbs. It is enough to insert safely into your window. However, heavier ones are pretty hard to mount. They often require a professional to get the job done, including additional costs.

  • Look for an energy-efficient series.

All brands will show that their products are energy-savers in today’s market. But that is not the case all the time. You must look for vertical units that are verified energy-efficient to save a year-long extra expense for electricity.

You can easily measure the Energy efficiency by EER, Energy-Efficiency Ratio. It is obtained by dividing BTU by maximum wattage input.

Example: 10,000BTU / 900W = 11.11 EER.

The higher the EER, the more electricity you will conserve and the lower the bill you will have to pay.

  • Pick the notable brands.

Choose a brand with caution. Any brandless products may claim to be of the same consistency and efficiency as well-known brands, but they are not. So be wise enough, do your research and choose the best brand. But of course, you can expect a higher value with high-rated products.

  • The cooling sound

Consider the noise level of the unit. Ask the provider or check the consumer’s manual to give you the idea. Everyone wants a quiet model. A casement model has noise level adjustments. If you’re going to ensure a super silent operation, set your noise level below 60dB.

And lastly, always ask about the warranty.

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temperature being changed

How to determine the correct size for your room

You can decide which to purchase depending on the size of the room. For example, you need approximately 20 to 25 BTU per square foot of living space in general practice.

It would help if you looked at the cooling capacity of the model to help you choose the best unit for the size of space you have. Keep in mind that the larger area, the more BTUs are required.

Is it possible to install a portable model in a casement window?

You may think a mobile unit on wheels can only be rolled from one location to another and has a tube to exhaust heat out the window. You’ll be surprised to discover that a portable model can also be used in a window casement.

Although portable models come with a standard kit, you can DIY a round inset to fit the size of your exhaust tube. The only option is to use Plexiglas material.

Here’s how:

  1. Get your Plexiglas and make a cut that fits the size of a panel.
  2. Cut out a little portal or a round hole that fits the exhaust fan correctly. You may choose the location, but the best one is in the lower portion of the Plexiglas. If you do not know about cutting Plexiglas, you may go to the hardware to let the expert do the cutting.
  3. Once you have the Plexiglas ready, begin the installation process. First, put the frame of Plexiglas with a hole and install it in the window.
  4. Secure the frame using clamps or clips.
  5. Seal it using waterproof stripping.
  6. Once the inset is waterproofed, attach the exhaust tube of the portable AC to the round inset. It’s good to go.

However, there is sealing readily available in the market.

Casement, vertical, and sliding window models are all options. Don’t get confused with these terms. There is no uniform term for these models. Instead, all of these names are the same. And that means they all have the exact requirement of a type they fit in, the casement frame.

Here’s how it is explained:

  • Casement air conditioners are the general name for one that fits a casement frame.
  • Sliding window models are a unit that holds a sliding window.
  • Vertical ACs are used to describe a model installed vertically, as the name suggests.

What is the best brand recommendation, if you ask us?

We highly consider the vertical models by Frigidaire. The brand is the biggest in the industry, as they’ve been around for many years. They have proven to be the powerhouse for cooling devices and appliances.

The Frigidaire FFRS 1022r1 is the highest quality casement and sliding window air conditioner on the market today. As a result, it is the most sought-after option out there.

It has a dimension of H20 ¼” x W14 ⅕” x T8 ½”. It’s enough to accommodate a height minimum of 22 ½” and width minimum of 15 ½” and depths of 23 ½”. It is perfect for everything from your kitchen to the entertainment room.


” refers to inch/inches

x refers to by or multiply by

Its power cord is 72 inches long, long enough to access power outlets in high places. Extension cords aren’t necessary anymore.

The functionality is excellent. It includes a 24-hour on/off timer and auto-fan. It is very energy efficient as its start-up starts in low voltage with a sleep mode and a multi-function electronic control. It also has a red warning light that indicates if you already need to clean the filter. You can easily select options with just a touch of a button.

Its total coverage area is up to 450 square meters with a maximum coolness of 10,000 BTU. Its combined EER is 10.4, which means it is super energy-efficient. You can save more on your bill. In addition, it is compelling and cools most of your rooms. It works great even in a low setting.

Even in your insulated sunrooms, it can make a significant difference that often gets too hot every summer. It works well in hot regions where a string of heatwaves often strike. It’s the perfect unit to treat the heat.

It also has an open/close venting system, ideal for rooms without exhaust fans or ventilation. In addition, it self-ventilates the indoor air to the outside. It is particularly useful in kitchens without exhausts.

thermostat being adjusted

It includes mounting instructions and incredible equipment that makes the installation easy.

This remote-controlled electronic device has a voltage rating of 115 volts. If you experience a power interruption, the device will immediately start and operate. And that is a safe and energy-saver. Hence, it offers optimum comfort overnight while still saving electricity.

The Frigidaire FFRS 1022r1 is currently the best one for casement and sliding spaces.

The Frigidaire Appliance Company developed a reputation for providing robust products in the market. Up until now, they are still the leading brand in the community.

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Can you put a window air conditioner in a casement window?

Yes, you can easily place your window air conditioner in a casement window.

Can you put an air conditioner in a sliding window?

Yes, it is possible. You can position an air-conditioner to allow the sliding window to open and close smoothly. The process can be tricky, but it’s doable.

Is a window air conditioner worth it?

Why is it not? Window air conditioners are more efficient and cost-effective. They call for easier servicing and maintenance than others. Ideally, window air-conditioners are what everyone should invest in. People prefer split air-conditioners over window air-conditioners because of the lack of windows present in their room. People do have windows. Nonetheless, they prefer not to hog them with some bulky machinery. Others may not have the right window, to begin with.

Is it cheaper to run a window air conditioner or central air?

Installing a couple of window air-conditioners in your house is cheaper than installing centralized air-conditioning. Once installed, central air-conditioning will prove cheaper as it consumes less energy than several independent air-conditioners in your house.

As long as your AC can fit into the casement window, here is how you can begin to install it:

How do you install a window air conditioner in a vertical casement window?

  1. Install a base to support the windowsill

    The windowsill is not made to support your air-conditioner. You’ll need to install a wooden board cut out and made accurately after measuring the width and height of your air conditioner.

  2. Mark the center point.

    The next step involves marking the center point of your window frame.

    Your window frame will have several edges, but it will only have one edge facing up towards the air-conditioner. In other words, find the leftmost edge of the frame and use a T-square to see where the center point of the window lies.

    Mark this center point and proceed to the next step.

  3. Install the platform assembly.

    Keeping in mind that the longer protruding side needs to be placed externally, begin installing your platform assembly.

    Use a screwdriver to dig in a hole and line it up with the center point you had marked in the previous step. Adjoin the platform assembly onto your support base.

  4. Secure the platform assembly.

    Once the platform assembly looks like it’s in place, we need to ensure that it’s secure.

    Finish installing the platform assembly as per the manufacturer’s instructions on the box. You will probably need to place a steady ladder outside the house to complete this step.

    Finally, use a couple of screws to secure your siding.

  5. Place the air-conditioner on the window.

    Ask a friend to help you out in this step.

    Open the window as wide as possible and lift the air-conditioner. Push through the window and onto the platform assembly.
    Now close the window sash on the left side of the air-conditioner.

    The window sash should be behind the metal bracket sticking out from the a.c. The metal bracket taking the support of the sash provides the biggest support to the a.c.

  6. Ensure a slight drop downwards for water discharge.

    All air-conditioners discharge some amount of water. For this reason, it is recommended that they are installed at an angle that lets them tip water down the back rather easily. Manufacturers recommend this drop to be ¼ inches from the back.

    You can proceed to the next step after you’ve achieved that ¼-inch drop with your platform assembly.

  7. Fill the top gap of your vertical casement window.

    You just finished placing your air conditioner in a vertical casement window. There’s a giant gap exposing your house to the outside. What do you do?

    Pull the panel frame up completely. Fill the gap with either a poly carbon sheet or acrylic sheet, available at most home centers. You can pick out any lightweight board that aligns with the aesthetic presence of your home.

    Use a plastic cutting tool, also found at home centers. Cut a window that is 15-inches, or whatever the width of your air-conditioner measures.

    For the height, you will need to add ¼ inches to the existing height of your a.c unit to allow the tip we adjusted in the 6th step.
    After installing this sheet, installing your air-conditioner on your vertical casement window is complete.

Last words:

A casement or a vertical window air conditioner unit is ideal for keeping your space cool and comfortable all day. It’s particularly great during hot seasons, whether you have a side slide or something else. They are highly cost-effective and dependable. Ergo, a perfect summer add-on for your home!

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