{Top 5} Best Air Conditioners for Sliding Windows (2023)

If you are looking for the best air conditioner for a vertical-sliding window, then you are at the right place. 

In this post, we will take a look at the {Top 5} Best Air Conditioners for Sliding Windows available in the market today. 

We will provide detailed information about each air conditioner to help you choose the best air conditioner for your needs. 

Let’s dive in and find the right air conditioner for your sliding window needs!

{Top 5} Air Conditioner for Sliding Window: An Overview


AC's Image

AC's Name

Cooling Power

Coverage Area



Noise Levels


Overall Rating

Check Price link


Editor’s choice!


10,000 BTU

450 sq ft

14.5″D x 23.5″W x 20.25″H

72 pounds

72.3 dB




Koldfront CAC8000W

8,000 BTU

300 to 350 sq ft

14.5″D x 23.5″W x 20.88″H

75 pounds

56 dB




PerfectAire 3PASC10000

10,000 BTU

450 sq ft

14.75″D x 23.5″W x 21″H

72 pounds

61 dB




Keystone KSTSW08A

8000 BTU

350 sq ft

23.5″D x 14.57″W x 20.87″H

64.6 pounds

59 dB




Arctic King 10,000 BTU

10,000 BTU

450 sq ft

H 20.9 in, W 14.6 in, D 23.5 in

84 pounds

63 dB

(10.4 EER), (9.5 CEER)


{Top 5} Sliding Window Air Conditioners Review

Here are the full reviews of these five air conditioners for sliding window air conditioners.


Editor’s choice!
  • Energy Efficient
  • Has a rating of 4.4 out of 5
  • Easy to install and operate
  • Ideal for cooling large rooms up to 450 sq ft
  • Becomes noisy when running on high fan speed
Cooling Power10,000 BTU
Coverage AreaUp to 450 sq ft
Dimensions14.5″D x 23.5″W x 20.25″H
Weight72 pounds
Noise Levels72.3 dB
Seasonal Energy Efficiency Ratio (SEER) 10.4
Voltage requirements115 Volts

This FRIGIDAIRE FFRS1022R1 air conditioner for sliding windows is one of my favorite ac units. It has a cooling power of 10000 BTU, making it capable of cooling a room of up to 450 square feet. 

The dimensions of the FRIGIDAIRE FFRS1022R1 are 14.5 inches in depth, 23.5 inches in width, and 20.25 inches in height. The unit is available in white and requires a standard 115V electrical outlet to operate. And to be honest, its design is pretty attractive.

And just like most of the air conditioners, it also comes with a remote control that enables you to operate it from a distance with ease.  The air conditioner also has multi-speed electronic controls with a 24-hour on/off timer, making it easy to program and customize according to your needs.

The FRIGIDAIRE FFRS1022R1 is also energy efficient, thanks to its Energy Saver mode, which helps to conserve energy and reduce costs over time. This mode automatically adjusts the temperature to maintain a comfortable environment while minimizing energy usage.

In addition to its various features, it also has a Seasonal Energy Efficiency Ratio (SEER) of 10.4, which indicates its level of energy efficiency.

Another noteworthy feature of this AC unit is its effective dehumidification function, which removes up to 3.4 pints of moisture per hour from the air. This is an important feature during the hot and humid summer months, as excessive humidity can lead to mold growth and other health hazards.

However, as with any product, there are some drawbacks to consider. One potential issue with the FRIGIDAIRE FFRS1022R1 is that it is noisy, when running it on high I notice a noise level of 72.3 dB, which is pretty high if we compare it to other window units.

Overall, the FRIGIDAIRE FFRS1022R1 is a solid option for those in need of a casement or sliding window air conditioning unit. Its remote control functionality, Energy Saver mode, and SEER rating make it an efficient choice. If you are interested, you can check it out using this link.

#2 Koldfront CAC8000W

Koldfront CAC8000W casement air conditioner
Recommended to buy!
  • Highly energy efficient
  • Operates quietly
  • Nicely designed
  • Comes with a bunch of features
  • Poor customer support
Cooling Power8,000 BTU
Coverage Area300 to 350 square feet
Dimensions14.5″D x 23.5″W x 20.88″H
Weight75 pounds
Noise Levels56 dB
Seasonal Energy Efficiency Ratio (SEER) 11
Voltage requirements115 Volts

I recently bought the Koldfront FFRS1022R1 Casement Air Conditioner to review it as I had my doubts about this unit and I am extremely impressed with its performance. However, there were a few disappointing aspects that I will discuss later in my review.

Firstly, the unit’s 8,000 BTU cooling capacity was perfect for the size of my room and effectively cooled the space during even the hottest of days. Well it is also available in 10,000 BTU which can cool up to 450 square feet of space. 

Its design allows it to fit windows that are 15-½ to 16-¼ inches wide, with a minimum height of 20-5/16 inches. So no matter where you want to place it, this air conditioner will likely fit perfectly.

Furthermore, the window air conditioner operates quieter, its noise level is 56dB. I know it is not as quiet as other window air conditioners in the market, but when it comes to air conditioners for sliding windows, it’s good.

This unit’s remote control is incredibly convenient, allowing you to make adjustments to features and operation settings from up to 16 feet away. This feature adds to the overall ease of use and accessibility of the air conditioner.

But that’s not all – this Koldfront CAC8000W casement air conditioner also comes with washable air filters, ensuring you always have clean air in your home. And, it’s highly energy efficient, with features like a check filter alert, thermostat-controlled operation, sleep mode, and an energy saver mode that cycles the fan to save on energy costs.

And ecocostsavings.com conducted a study which revealed that the annual cost of running window air conditioners ranges from $46.50 to $432.75. However, the Koldfront unit stands out as it only costs $71 per year, making it a highly cost-effective option.

Speaking of sleep mode, you’ll love how it adjusts the temperature periodically by 2°F before returning to your set temperature after six (6) hours, ensuring you’re resting comfortably while also saving on energy bills. 

Talking about its drawbacks, this unit is only designed to be installed on horizontally sliding windows, which may limit its compatibility with some homes or apartments.

Another drawback is that some buyers have reported that the unit displays an error code indicating a refrigerant shortage after just a few months of use. 

An additional drawback of this Koldfront CAC8000W air conditioner for sliding windows is the poor customer support, which has also been mentioned by some buyers and I experienced this issue with this unit as well. This can be a significant issue if you encounter any problems with the unit or need assistance with installation or troubleshooting.

Despite these drawbacks, the air conditioner has received an overall rating of 4.1 out of 5. While this may not be considered high quality for some buyers, it is still a respectable rating and suggests that many users have found the unit to be effective and reliable.

Now, what do you think of this unit? In my opinion, the Koldfront CAC8000W Window Air Conditioner can be a good option for those who have horizontally sliding windows. It is also budget friendly, you can check its current price from the link given below:

#3 PerfectAire 3PASC10000

PerfectAire 3PASC10000
  • Affordable
  • Its SEER rating is 13
  • 4-way adjustable air vents
  • Noise level is above 60dB
Cooling Power10,000 BTU
Coverage AreaUp to 450 square feet
Dimensions14.75″D x 23.5″W x 21″H
Weight72 pounds
Noise Levels61 dB
Seasonal Energy Efficiency Ratio (SEER) 13
Voltage requirements115 Volts

The PerfectAire 3PASC10000 is a powerful and efficient window air conditioner that can keep any room cool and comfortable, even on the hottest days of summer. With its compact size and sleek design, it’s a great option for anyone who wants to stay cool without sacrificing style or functionality.

First of all, let’s talk about the design. The PerfectAire 3PASC10000 has a modern and stylish look that fits in with any décor. It’s also compact and lightweight, weighing 72 pounds, making it easy to move from room to room when needed. The control panel is located on the top of the unit, and is easy to use and navigate, even for those who are not technically inclined.

Now, let’s get to the important stuff: how well does it work? The answer is, incredibly well. This air conditioner can cool rooms up to 450 square feet, which is more than enough for most bedrooms, living rooms, or offices. It has three different fan speeds, so you can choose the level of cooling that works best for you.

One of the standout features of the PerfectAire 3PASC10000 is its seasonal energy efficiency ratio (SEER) of 13. This means it is highly efficient at cooling your space, which can help you save money on your electric bill. And its noise level is 61 dB which might be disruptive for some people and it really is.

Another great feature is the programmable timer. You can set the unit to turn on or off at specific times, which can help save energy and money on your electric bill. And if you ever lose power or need to move the unit, the auto-restart function will make sure it starts up again like never before.

It operates on 115 volts and is cULus listed, which means it meets safety standards in both the US and Canada. Installation is easy thanks to the included window mounting kit. Additionally, the unit is relatively affordable as compared to other sliding window air conditioners on this list.

If you are interested in buying this PerfectAire 3PASC10000 air conditioner for the sliding window, you can check its current price from the link below.

#4 Keystone KSTSW08A

Keystone KSTSW08A
Ideal for medium-sized rooms!
  • Compact and portable
  • Comes with Clean Filter Alert feature
  • Highly-energy efficient
  • 4-Way Air Direction Control
  • Dehumidification capacities too low
Cooling Power8000 BTU
Coverage AreaUp to 350 square feet
Dimensions23.5″D x 14.57″W x 20.87″H
Weight64.6 pounds
Noise Levels59 dB
Seasonal Energy Efficiency Ratio (SEER) 10.8
Voltage requirements115 Volts

Just by reading its review, I can confidently say that this Keystone KSTSW08A Slider Casement Window Conditioner is a reliable and convenient option for cooling small to medium sized rooms. This air conditioner is made by Keystone and has a cooling power of 8000 BTU, making it an ideal choice for rooms up to 350 square feet. It is also available in 10,000 BTU which can cool up to 450 square feet of space.

One of the most notable features of this air conditioner is its 3-in-1 functionality. Not only does it provide powerful cooling, but it also works as a dehumidifier with a capacity of up to 0.9 liters per hour. Well, it may not be sufficient for areas with high humidity levels or for those that require a high level of dehumidification.

Furthermore, the electronic controls and 3 fan speeds make it easy to customize the settings to your personal preferences, and the energy-saving mode helps reduce your overall energy consumption.

In addition, the 4-Way Air Direction Control is a convenient feature that allows you to direct the air flow where it is needed most, ensuring optimum comfort. Clean Filter Alert is another great feature that notifies you when it’s time to clean the filter, ensuring the air stays clean and free of dust, debris and contaminants. Which in turn saves energy and helps your unit to deliver the best possible output.

The dimensions of the product are 23.5″D x 14.57″W x 20.87″H, and it comes in a sleek white color that blends in well with any décor. The voltage required to operate this air conditioner is 115 volts.

As for its ratings, the Keystone KSTSW08A 8,000 BTU Sliding Window Air Conditioner has an impressive rating of 4.5 out of 5 stars, which is a testament to its high quality and effectiveness. However, the unit only has a global rating of 46, which is pretty low.

Talking about its energy efficiency, it is highly energy-efficient and has a Seasonal Energy Efficiency Ratio (SEER) rating of 10.8, which is quite good. In fact, according to the manufacturer’s estimates, this air conditioner only costs $72 to run annually, which is significantly less than many other air conditioning units on the market.

Overall, the Keystone KSTSW08A 8,000 BTU Window Air Conditioner for Vertical Sliding Window is a great choice for anyone in need of a reliable, easy-to-use, and energy-efficient air conditioning unit for small to medium-sized rooms.

In terms of pros and cons, this air conditioner is compact and portable, making it easy to move around the house. The Clean Filter Alert feature ensures that the air remains clean and free of contaminants and is highly energy efficient.

On the other hand, the dehumidification capacity of this air conditioner is very low, which may be a drawback for some users. Its noise level is neither too loud nor too silent. So if you are impressed with this unit, you can have a look from the link below:

#5 Arctic King 10,000 BTU Casement Window Air Conditioner

Arctic King 10,000 BTU Casement Window Air Conditioner
Cheapest one!
  • Super affordable
  • User friendly
  • Slightly efficient
  • Pretty heavy
  • Little Noisy
Cooling Power10,000 BTU
Coverage AreaUp to 450 square feet
DimensionsH 20.9 in, W 14.6 in, D 23.5 in
Weight84 pounds
Noise Levels63 dB
Seasonal Energy Efficiency Ratio (SEER) (10.4 EER), (9.5 CEER)
Voltage requirements115 Volts

Our SPA team recently purchased this Arctic King 10,000 BTU Casement Window Air Conditioner, and we are thrilled with its performance. It quickly and efficiently cooled my 180 square foot room, creating a comfortable and healthy environment. By the way, it can cool up to 450 square feet of space.

One of the features I love is the electronic controls and remote control, which makes it easy to set the comfort level I prefer. I can precisely control the temperature and fan speed from across the room, without getting up and manually adjusting the unit. The fresh air ventilation system also ensures that the air in my room is always clean and healthy.

Another great feature is the washable filter, which makes maintenance easy. I can easily remove and clean the filter, ensuring that my air conditioner is always operating at optimum performance. The unit is also super affordable, making it a great option for anyone on a budget. 

One of the downsides to this air conditioner, however, is that it is quite heavy. Its weight is around 84 lb. This can make it difficult to install and move if needed. Additionally, the unit can be a little noisy at times, which may be a concern for some users.

The Arctic King 10,000 BTU Casement Window Air Conditioner also features an automatic slinger-up system. It basically helps in removing excess moisture from the air by slinging it over the condenser coils. This prevents water build-up and the growth of mold and mildew, improving efficiency and comfort.

Overall, the unit is nice and considerate. I would recommend the Arctic King 10,000 BTU Casement Window Air Conditioner to anyone who is looking for an easy-to-use, efficient, affordable, and reliable air conditioner for a sliding window. It currently costs $415. You can check its current price from the link given below:

Factors to Consider When Buying an Air Conditioner for Sliding Windows

Choosing the right air conditioner for sliding windows can be a daunting task. This is due to the fact that not all air conditioning units are specifically designed to fit sliding windows, and selecting the wrong one can result in installation issues, poor performance, and higher energy costs.

Here, we will discuss the factors to consider when selecting the best air conditioner for a sliding window to help you make an informed purchase decision.

Dimensions of the unit

When purchasing an air conditioner for sliding windows, the dimensions of the unit should be the first factor to consider. It is important to know the size of your window so that you can choose the appropriate air conditioner size. 

The height, width and depth of the unit should match or be less than the measurements of your sliding window.

A unit that is too large won’t quite fit in the window. To determine the correct measurement, measure the top, bottom, left and right sides of the window that opens from inside the house. 

Leave some space between each side to ensure proper installation. After taking all measurements, compare them to the listed dimensions.

Cooling capacity of the unit

The second factor to consider is the cooling capacity of the air conditioner. This is determined by the size of the room you want to cool. 

A unit that is too small will not be effective in cooling the room, while a unit that is too large will consume more energy and lead to higher electric bills. 

To determine the appropriate size, measure the square footage of your room and refer to the manufacturer’s size chart.

Here are the preferred sizes according to the size of a room:

Energy Efficiency

When purchasing an air conditioner for sliding windows, it is important to keep energy efficiency in mind. 

Choose units with high energy efficiency ratings, as they consume less energy and result in lower electricity bills. 

You can identify the most energy efficient air conditioners by looking for the Energy Star label, which indicates that they meet strict energy efficiency guidelines established by the Environmental Protection Agency (EPA). Higher efficiency units are more expensive, but they will save you money in the long run by reducing your electricity bill.

Noise Levels

When buying an air conditioner for sliding windows, a major factor to consider is the noise level. You want a unit that won’t be too loud and disruptive to you or anyone else in the area. Keep in mind that higher decibel levels indicate more noise. 

Units with higher decibel ratings can range from 60 to 70 decibels, which is comparable to a conversation in a quiet room. Meanwhile, units with lower decibel ratings range from 20 to 40 decibels, which is equivalent to a whisper or rustling leaves.

Be aware that some manufacturers may list a maximum noise level, while others list an average. To get a better idea of ​​how noisy a unit makes, it’s helpful to read reviews from customers who have bought and used it.

Wrap Up: Air Conditioner for vertical Sliding Windows

To sum up, the Top 5 Best Air Conditioners for Sliding Windows in 2023 are chosen with great care, based on their excellent performance, high efficiency, and user-friendliness. 

These air conditioners possess the capability to cool down a room effectively and quietly, while also being easy to install and maintain. 

Whether you’re searching for an energy-efficient option or a unit with a stylish and modern design, you can find an air conditioner that meets your requirements on this list.

By purchasing one of these top-rated air conditioners, you can be confident in staying cool and comfortable throughout the summer season.

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Mr. Ashish

Mr. Ashish

Hi there, I am Ashish, the founder and editor of SoundProof Addict, I have more than 3 years of experience in soundproofing, also I've helped people soundproof their bedrooms, studios, cars and other areas where they find noise to be distracting or uncomfortable. I wants everyone to be able to enjoy as much peace and quiet.

1 Comment
  1. I appreciate you sharing this blog post. Thanks Again. Cool.

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