Having a casement or slider window air conditioner has a lot of benefits. It saves more room in relatively smaller areas while keeping them just as cool. They also tend to be more eco-friendly and energy-star certified, reducing your carbon footprint. If you want to know the best casement window vertical air conditioners that I've found, continue reading.
Best Casement Vertical Window Air Conditioners:
- Frigidaire FFRS1022R1 - Best Overall
- PerfectAire 3PASC10000 - Runner-Up
- Global Industrial MWDUL-10CRN1-BCJ4 - User-Friendly Pick
- Keystone KSTSW10A - Most Compact
- Koldfront CAC8000W - Best for Quiet Performance
| Product | Details |
| Frigidaire FFRS1022R1 | Dimensions: 23.5″ x 14.5″ x 20.25″ BTU: 10,000 Coverage: up to 450 sq. ft. |
| PerfectAire 3PASC10000 | Dimensions: 23.5” x 14.75” x 21″ BTU: 10,000 Coverage: up to 450 sq. ft. |
| Global Industrial MWDUL-10CRN1-BCJ4 | Dimensions: 23.5” x 14.63” x 20.88″ BTU: 10,000 Coverage: up to 450 sq. ft. |
| Keystone KSTSW10A | Dimensions: 23.5” x 20.87” x 14.57″ BTU: 10,000 Coverage: up to 450 sq. ft. |
| Koldfront CAC8000W | Dimensions: 23.5” x 14.5” x 20.88″ BTU: 8,000 Coverage: up to 350 sq. ft. |
Best Casement Window AC Units
There seems to be an endless pool of casement window air conditioners, so I had to narrow down the available options to my top 5 choices for the best casement/vertical AC units. So, here are the best options in detail.
1. Frigidaire FFRS1022R1 - Best Overall
| Cooling Capacity: | 10,000 BTU |
| Recommended Square Footage: | Up to 450 sq ft |
| EER : | 10.4 |
| Dimensions (WxDxH in inches): | 23.5″ x 14.5″ x 20.25″ |
| Weight: | 72 |
Frigidaire is one of the most famous brands in the HVAC industry, so it comes as no surprise that our top choice is the Frigidaire FFRS1022R1. The unit comes with an installation kit that's made specifically for casement and sliding windows so that you can make any adjustments needed for fitting it right away.
In terms of cooling power, it has 10,000 BTU and can cover up to 450 square feet. Furthermore, it has an energy efficiency rating of 10.4, which means that you'll save money on energy bills. Even better, it has a dehumidifier mode that can remove up to 3.4 pints/hour.
This sliding window air conditioner is also relatively easy to use. It comes with its own full-function remote control so that you can adjust its settings from a distance. In addition, it enables you to choose from three fan speeds: low, medium, and high fan speed.
The 24-hour timer allows you to save energy. In addition, multiple modes put you in complete control, such as sleep mode, energy-saver mode, auto cool, and 4-way airflow. Plus, the appliance features an alert for changing the washable mesh filter.
Pros:
- Comes with an installation hardware
- Has a dehumidifier mode
- Has Auto cool, Energy Saver mode, Sleep mode, 4-way air flow, and check filter alert
- Has a high ERR rating
- Has remote controls
- The 24-hour timer helps you save energy
- Multiple fan speeds
Cons:
- Can get noisy
2. PerfectAire 3PASC10000 - Runner-up
| Cooling Capacity: | 10,000 BTU |
| Recommended Square Footage: | Up to 450 sq ft |
| EER : | 10.4 |
| Dimensions (WxDxH in inches): | 23.5” x 14.75” x 21” |
| Weight: | 72 |
If you want another product that's comparable to our favorite option, consider the PerfectAire 3PASC10000. Like our top choice, this cooling beast can fit like a glove in your horizontal sliding or crank-out casement window, thanks to its installation kit.
It doesn't disappoint with its powerful 10,000 BTU and maximum coverage area of 450 square feet. Moreover, it has an EER rating of 10.4, which means that it'll cost you less in the long run.
Thankfully, it comes with dream-like features. Its remote control doubles as a portable air conditioner thermostat to maximize its coverage. It has three fan speeds and gives you control of its direction.
More importantly, it has an auto-restart mode, sleep mode, dry mode, and energy saver modes. Finally, the washable filter is front-mounted with the tilt-out to make cleaning a breeze.
Pros:
- Comes with an expandable window mounting kit
- Has a high ERR rating
- Comes with a remote control that has different fan speeds and a portable air conditioners thermostat for total room coverage
- Has different modes like auto, sleep, dry, and energy-saving mode
Cons:
- Might make some noise
3. Global Industrial MWDUL-10CRN1-BCJ4 - User-Friendly Pick
| Cooling Capacity: | 10,000 BTU |
| Recommended Square Footage: | Up to 450 sq ft |
| EER : | 10.4 |
| Dimensions (WxDxH in inches): | 23.5 x 14.63 x 20.88″ |
| Weight: | 85 |
If you're in a hurry for a quality casement window air conditioner that gets the job done with no nonsense features that distract the average user, you'll like the user-friendly Global Industrial MWDUL-10CRN1-BCJ4.
Like any casement window air conditioner worth your time, it comes with a free mounting kit so that you can fit it into your window without paying an extra penny.
Moreover, it has an impressive 10,000 BTU that can easily cover an area of 450 square feet. Thanks to its EER rating of 10.4, its energy consumption is under control. In addition, the dehumidifier function comes in handy when it gets too humid, as it can remove 2.3 pints of moisture per hour.
Furthermore, it comes with remote controls, a programmable timer, and multiple cooling speeds. Like any good AC unit, it comes with various modes, such as cool, sleep, auto restart, energy-saving features, and fan mode. The one thing we'd say is that the warranty may not be so reliable.
Pros:
- Comes with an installation kit
- Has a high ERR rating
- Comes with remote controls, a programmable timer, and three speeds
- Has a dehumidifying function
- Has multiple modes like auto, sleep, fan, cool, and energy saver mode
Cons:
- The warranty is unreliable
4. Keystone KSTSW10A - Most Compact
| Cooling Capacity: | 10,000 BTU |
| Recommended Square Footage: | Up to 450 sq ft |
| EER : | 10.4 |
| Dimensions (WxDxH in inches): | 23.5” x 20.87” x 14.57″ |
| Weight: | 34.9 |
If you already know that your horizontal sliding windows are small, then there's no point in wasting your time on larger units. Instead, we recommend the Keystone KSTSW10A as the best small horizontal window air conditioner.
First things first, this compact gem will go easy on your wallet. It also comes with a free mounting kit because you shouldn't have to pay more for a unit that fits.
Furthermore, it has a powerful 10,000 BTU that can cool down any room of 450 square feet. The EER rating is 10.4, rendering it a money-saving device. Also, it has a dehumidifying function that removes 1.1 pints of moisture/hour.
You'll also love the remote mechanical controls, adjustable timer, and three fan settings that give you complete control. Also, we can't skip the modes that it offers, such as cool, dry, auto, sleep, and energy saving. Nonetheless, we have to say that this isn't the AC unit for over 450 square feet.
Pros:
- Perfect for small windows
- Relatively affordable
- Comes with a mounting kit
- Has multiple modes like cool, dry, auto, sleep, and energy-efficient mode
- Comes with remote controls, an adjustable timer, and three different speeds
Cons:
- Not suitable for areas larger than 450 square feet
5. Koldfront CAC8000W - Best For Quiet Performance
| Cooling Capacity: | 10,000 BTU |
| Recommended Square Footage: | Up to 350 sq. ft. |
| EER : | 11.0 |
| Dimensions (WxDxH in inches): | 23.5” x 14.5” x 20.88” |
| Weight: | 75 |
If you've had loud air conditioners before, you know how inconvenient they can be. For a quiet operation, we recommend the Koldfront CAC8000W.
It operates on 8,000 BTU for small spaces. And if you're looking for the highest EER rating, this is the AC unit for it, which gives it maximum efficiency. Its dehumidifying function facilitates removing excess moisture. Thanks to the remote controls, multiple speeds, energy saving, and sleep modes, it's one of the easiest units to use.
The only drawbacks are that this unit can't service areas larger than 350 square feet. It's also not the best for a window that slides vertically, meaning that we wouldn't have it mounted vertically.
Pros:
- Comes with remote controls and multiple speeds
- Has helpful modes like energy saver and sleep mode
- Has the highest EER rating
- Has a dehumidifying function
Cons:
- Not suitable for areas larger than 350 square feet
- Not ideal for a vertically sliding window
Casement vs. Vertical vs. Slider vs. Sliding Window Air Conditioners (Terminology Explained)
If you have any of the windows above, you know that they're smaller than the average window, which renders the standard window air conditioner unsuitable.
The abundance of terms describing a particular type of air conditioner might confuse you, so here's a breakdown of what these terms mean:
- A casement window air conditioner is one that fits inside a casement window frame.
- A vertical window air conditioner is one that only fits a vertical window.
- A slider or sliding window air conditioner fits a sliding window, where you can slide the window itself as much as the air conditioner allows.
Despite the difference in the terminology, they're actually used interchangeably. In other words, anyone can easily install a sliding window AC unit into a casement window or a casement air conditioner into a sliding window.
5 Key Factors to Look For in Sliding Window Air Conditioners
Realistically, no one air conditioning model meets all needs. So, the section below should help you narrow down your choices with a better understanding.
Cooling Capacity
As the name suggests, we're reviewing the ability of the AC unit to cool down a room over time. After all, nothing beats fresh and cooled air to overcome the summer heat, and you want to feel the impeccable indoor air quality and change in airborne particles.
The cooling capacity of the casement window ACs is the same as their cooling power, which you can measure in British thermal units or BTU. It typically ranges from 5,000 BTU to 16,000 BTU.
However, it only comes in 8,000 BTU or 10,000 BTU in casement window units. The higher the BTU, the better the air conditioner will perform, especially if placed in warmer rooms or rooms that are exposed to sunlight most of the day. So, try to go with 10,000 BTU if you can. Also, the BTU of an AC unit is crucial because it directly affects almost all other factors.
Coverage Area
The room coverage that an air conditioner provides is directly related to its BTU. So, as you can probably guess, a higher BTU means cold air in a larger space, and a lower one is good enough in a smaller or naturally cooler area.
For example, a casement air conditioner with 8,000 BTU can cover a room of up to 350 square feet. Consequently, a unit with 10,000 BTU can easily cool air in a space up to 450 square feet. Ideally, each sliding window air conditioner comes with a listed coverage area to take the guesswork out of your purchase.
Energy Efficiency Ratio (EER)
Nobody wants their energy bills to pile up, and you can help prevent that by getting an energy-efficient vertical window air conditioner.
You can measure the energy efficiency of an AC unit by the Energy Efficiency Ratio or EER rating. You can calculate it by dividing the BTU by the wattage. For instance, the EER rating of an AC unit with 10,000 BTU and 1000W is 10,000/1000, which is 10. Therefore, a high EER rating means a more energy-efficient AC unit.
You can find the EER rating of any air conditioner on a yellow sticker. Of course, any air conditioning unit with a high EER rating (and better yet, an energy star) will cost more than others upfront, but it saves so much more in the long run. So, it's definitely a worthwhile investment.
Noise Levels
Whether you're buying a sliding window air conditioning unit or a standard one, a feature that you'll want either way is quietness. Unfortunately, an air conditioner that does the job well can still be inconvenient and even intolerable if it sounds like a lawnmower.
The noise level of an air conditioner is measured in decibels or dB. To illustrate, a casement window air conditioner comes with two noise levels: inner and outer. Ensure that if the manufacturer lists the inner noise level, which is what you'll be exposed to, it's under 60 dB.
Minimal Dimensions
What's the point of buying a sliding window air conditioner if it doesn't fit the window frame you'll put it in? Measure the window opening. Then, check if the minimum height and width of the sliding window AC you have in mind can fit in. In addition, try to add another inch to the width of the air conditioner to ensure that there's room for the installation kit.
Can You Mount a Window Air Conditioner Vertically?
That's only possible if your air conditioner has a vertical design. Otherwise, turning a regular air conditioner on its side will only serve to damage the appliance.
Conclusion
As you can see, the Frigidaire FFRS1022R1 stood out with impressive cooling powers and excellent features. And the PerfectAire 3PASC10000 lives up to the hype with energy-efficient performance and a multitude of operation modes. Finally, the Global Industrial MWDUL-10CRN1-BCJ4 is a user-friendly choice with just the right abilities and features.
