7 Best Sliding Window Air Conditioners (2023 Reviews)

Josh Mitchell

Written By

Josh Mitchell

Expert Reviewed By

Holly Curell

Last Updated On

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Quick Glance - My Recommendations

FRIGIDAIRE FFRS1022R1 10000 BTU 115-volt...

Frigidaire FFRS1022R1

My #1 Choice

FRIGIDAIRE FFRS0822S1 8000 BTU Heavy-Duty...

Frigidaire FFRS0822S1

For Small Rooms

hOmeLabs Window Air Conditioner 6000 BTU -...

Homelabs 6,000 BTU

Vertical Sliding

It’s easy to find a window air conditioner — if your windows slide up and down. But what if you have narrow horizontally sliding windows or casement windows that open on hinges?

Vertical air conditioners, also called casement window air conditioners, are your solution. They can fit in very narrow windows, but they are rare machines. 

I wrote this guide to the best sliding and casement window air conditioners to help you find a suitable unit. Let’s get to it and start cooling your home!

How We Review & Rank Our Product List

At Air Conditioner Lab, our team follows a similar process when evaluating all products reviews before formulating our final lists for readers.

We begin by gathering data sources directly from brands, e-commerce platforms, online retailers and press releases.

These are then added to a master file we use to compare features specifications from all humidifier models. You can access this Humidifier Sheet Here.

Next, we narrow down all the products on the market by evaluating user reviews, ratings and feedback from a wide variety of online and in-person sources.

Our team then discusses and co-ordinates our first hand experiences using these products, as well as gather independent opinions and feedback through Youtube and customer reviews.

7 Sliding Window Air Conditioners Reviewed

1. Frigidaire FFRS1022R1

4.5

Overall Score


Energy Efficiency

4.5

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Cooling Ability

4.5

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Value For Money

4.5

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Pros
  • Powerful cooling performance
  • Plenty of user modes and options
  • Remote control operation
  • Simple usability
  • Washable antibacterial filters
CONS
  • Not suitable for standard windows
  • Poor energy-efficiency
  • Thermostat is sensitive to the sun
  • Dim indicator lights

Got a bigger room and want to cool it without browsing through dozens of different ACs. If you’re in this situation, Frigidaire FFRS1022R1 will keep you cool without a hassle.

The FFRS1022R1 (try saying that 10 times fast) has plenty of cooling power. With 10,000 BTU, it’s rated for rooms up to 450 square feet but I found that it will keep even much larger spaces at a comfortable temperature.

Like most other ACs on my list, it comes with multiple programmable user modes, including Auto Cool,  Sleep, and Energy Saver mode. There’s also a handy timer function. 

Usability is pretty simple with push buttons on the unit and a remote control. The display and indicator lights are pretty faint and hard to see, though, especially in daylight.

What I do like is the antibacterial filter. I don’t have lab results to prove just how effective it is, but as an asthma sufferer, anything that actively removes outdoor pollutants from the air is welcome in my books.

The filter is washable, so you will save money on replacements. The unit also turns on a (dim) indicator light when the filter needs a rinse.

The FFRS1022R1 is a loud unit. Standing next to it is like standing next to a vacuum. If you’re a light sleeper, I say pick something else for your bedroom.

Also, direct sunlight seems to throw the thermostat off and make the AC run even if the indoor temperature is where it should be. You can compensate by setting the target temperature a bit higher, but it’s good to be aware of the issue.

Despite a couple of design flaws, Frigidaire FFRS1022R1 is a straightforward and powerful AC for horizontally sliding windows.

Feature

Details

Energy Efficiency

10.4 EER

BTU Rating

10,000

Weight

72 lbs

Dimensions

23.5” x 14.2” x 20.2”

Coverage Area

450 sq. ft.

Warranty

2 years


2. Frigidaire FFRS0822SE 

4.4

Overall Score


Energy Efficiency

4.5

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Cooling Ability

4.0

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Value For Money

4.7

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Pros
  • Good cooling capacity for its size
  • Simple to use and install
  • Remote control
  • Washable antibacterial filters
  • Quiet-ish
CONS
  • Poor packaging
  • Dim indicator lights
  • Weird drain location
  • Not for vertical sliding windows

Maybe you want to cool a smaller room with horizontal sliding windows and the first Frigidaire is complete overkill for you. Frigidaire still has you covered with the FFRS0822SE.

With 8,000 BTU of power, this air conditioner is rated for rooms up to 350 square feet. Like with its bigger brother, I wouldn’t be surprised if it worked decently well for even bigger rooms. It certainly feels like it has what it takes.

Feature-wise, the Frigidaires are practically identical. You get the Energy Saver and Sleep mode, antibacterial and washable filters, timer function, and remote control. Same stuff, just in a smaller package.

The FFRS0822SE does beat its sibling in energy efficiency and noise. It consumes marginally less power and is a little bit quieter. It’s not silent by any means, but if you can sleep with a hotel room air conditioner on, this thing won’t bother you either.

The front panel is pretty much the same as on the bigger unit, so the lights are quite dim. The condensation drain is also positioned weirdly high on the unit, which causes it to collect some water.

Yet, the biggest issue seems to be with the packaging. A lot of people have received a unit that’s damaged right out of the box. Fortunately, Frigidaire sends prompt replacements, but it’s still a hassle.

The unit itself is good and reliable, making it one of the best small horizontally sliding window AC units.

Feature

Details

Energy Efficiency

10.8 EER

BTU Rating

8,000

Weight

68 lbs

Dimensions

14.2” x 23.5” x 20.2”

Coverage Area

350 sq. ft.

Warranty

2 years


3. Koldfront CAC8000W

4.4

Overall Score


Energy Efficiency

5.0

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Cooling Ability

4.0

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Value For Money

4.2

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Pros
  • Decently quiet
  • Cooling power above its rating
  • Energy-efficient
  • Reliable operation
CONS
  • Heavy unit
  • No timer included
  • Packaging problems

Some AC units are notoriously loud. For those who want quiet cooling, the Koldfront CAC8000W is the best window AC unit for side-sliding windows.

The Koldfront is rated for an average noise level of 55 dB — a bit quieter than a regular conversation. In person, though, this is one of the smoothest-operating air conditioners for sliding windows you can find. Case in point, it seems to run only half as loud as the Frigidaires.

This casement air conditioner keeps you nice and chilly, too. Like the Frigidaire FFRS0822SE, it’s rated for 8,000 BTU but punches way above that. Technically intended for 350-square-foot rooms, this AC can keep even a 1,000-square-foot one comfortable.

The Koldfront doesn’t lag behind its competition in features, with an Energy Saver and Sleep mode and remote control. Sadly, there’s no timer, but I’ll forgive that for the unit’s high energy efficiency.

I really appreciate how reliable Koldfront has made this machine. With proper maintenance and installation, it will work for years without issue.

Talking about proper installation, though, that’s a two-person job. This is the single heaviest unit on my list, so you can skip the gym on the day you hoist this beast in place.

Like with the smaller Frigidaire, you might also get a banged-up unit from the start. Koldfront’s customer service is delightfully good, though, so you can get it replaced.

If you’re looking for a quiet AC unit for your bedroom’s horizontally sliding or casement windows, I can recommend the Koldfront. 

Feature

Details

Energy Efficiency

11.0 EER

BTU Rating

8,000

Weight

75 lbs

Dimensions

23.5” x 14.5” x 20.9”

Coverage Area

350 sq. ft.

Warranty

2 years


4. PerfectAire 3PASC10000

4.3

Overall Score


Energy Efficiency

4.5

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Cooling Ability

4.5

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Value For Money

4.0

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Pros
  • Low energy consumption
  • Comes with full mounting kit
  • Neat portable thermostat
  • Can work with horizontal and vertical sliding windows
CONS
  • Loud
  • Packaging issues

Tired of your sliding window air conditioner racking up your electricity bill? Cooling always comes with a cost, but PerfectAire 3PASC10000’s high energy efficiency can make that pill less bitter to swallow.

With a seasonal EER rating of 13, this is the most energy-efficient unit on my list. With 10,000 BTU of cooling power, comparable to the bigger Frigidaire, it does a great job of keeping large spaces cool without draining your wallet. The unit itself isn’t badly priced, either.

The PerfectAire ships with a complete installation kit, including accordion panels, a support bracket, top rail, and even a screwdriver. Having everything in one package makes the heavy unit easier to install. I just wish the instructions were better — be prepared to use your imagination at some points.

Like the Frigidaire models, the PerfectAire has washable filters, which saves you more money on maintenance. The other features are there too — four fan speeds, filter indicator, Sleep and Energy Saver mode…

I think all these manufacturers might actually use the same control panel.

PerfectAire does have one unique feature I like — the Follow Me thermostat. The thermostat is embedded in the remote control and automatically sets the AC based on where the thermostat is. You can always stay cool, as long as you remember to keep the remote with you.

Although this is a sliding and casement window AC, it can also work with narrow double-hung windows. If you have an old home with narrow windows of any kind, this might just be the unit for you.

PerfectAire is loud, though, so I wouldn’t put it in the bedroom. But hey, maybe the energy savings will help you sleep better.

Feature

Details

Energy Efficiency

13 EER

BTU Rating

10,000

Weight

72 lbs

Dimensions

23.5” x 14.8” x 21”

Coverage Area

450 sq. ft.

Warranty

1 year


5. Keystone ‎KSTAW08A

4.2

Overall Score


Energy Efficiency

4.5

Current Progress
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Cooling Ability

4.0

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Value For Money

4.2

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Pros
  • Can fit many different window opening types
  • Relatively quiet
  • Simple usability
  • Reasonably priced
  • Example text
CONS
  • Sub-par energy efficiency
  • Not for regular vertically-sliding windows

There is no one-size-fits-all solution when it comes to air conditioners. Yet, Keystone KSTAW08A comes about as close as you can get to a unit that fits almost any window opening.

Now, it’s not designed for wide horizontal windows — for those you still need a standard window air conditioner. Otherwise, you should be all set.

On top of casement and vertical windows (that slide horizontally), the Keystone unit fits narrow vertical-sliding windows, like the PerfectAire. It also has a removable chassis, which makes it relatively easy to install even as a through-wall air conditioner.

With an 8,000 BTU rating, the Keystone matches the Koldfront and smaller Frigidaire air conditioners in power. It turns small- to medium-sized rooms basically into refrigerators. Although it’s not quite as quiet as the Koldfront, Keystone is not a loud window air conditioner. 

Unlike the Koldfront, though, Keystone has a full gamut of features, including a timer. You can control the three cooling speeds, dehumidifier, Energy Saver, and Sleep mode with the simple-to-use, responsive remote control.

As a nice touch, this vertical window AC unit is a bit lighter than most others on this list (though it's definitely heavier than the claimed 30.3 lbs). Installing it is still a two-person job, but every pound shed off the unit makes the process easier.

I’m not too impressed by the high-ish energy consumption, which is about on par with the small Frigidaire unit. An EER rating of 10.8 is just pretty sub-standard these days.

Yet, for those who need a window AC unit that can go in a horizontally sliding, a narrow double-hung, and a crank window, Keystone can bring you that versatility.

Feature

Details

Energy Efficiency

10.8 EER

BTU Rating

8,000

Weight

30.3 lbs

Dimensions

23.5” x 14.57” x 20.9”

Coverage Area

350 sq. ft.

Warranty

1 year


6. Homelabs

4.2

Overall Score


Energy Efficiency

4.0

Current Progress
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Cooling Ability

4.5

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Value For Money

4.2

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Pros
  • Affordable and energy-efficient
  • Punches way above its power rating
  • Wi-Fi connectivity
  • Compact design
CONS
  • No drainage
  • Doesn’t work with vertical or casement windows

I’ve listed a lot of vertical air conditioners so far — but what if your home has perfectly regular double-hung windows? Well, then the Homelabs 6,000 BTU is the best air conditioner for you.

As its name says, this window air conditioner is rated for 6,000 BTU, making it the weakest unit on my list. Yet, the numbers don’t tell the whole truth. The box says it’s for rooms up to 250 sq-ft, but this AC can handle spaces even triple that.

The unit comes with a rather lousy remote controller. That’s fine, though, because it’s Wi-Fi connectible and can pair with your smartphone — or Alexa. Combine that with the Follow Me function (like the one on PerfectAire) and you have one of the easiest-to-control window air conditioners.

This machine is lightweight and compact, so installing it is easier than the vertical window air conditioners. You don’t get a support bracket in the box, though, so you’ll have to either buy a separate one or rig up a stick-in-the-ground solution.

I appreciate the low energy consumption, with an Energy Star brand to prove it. Together with the low price of the unit itself, Homelabs can provide affordable cooling for your home.

For all the good things I’ve said about this AC, there’s one huge design flaw — there are no drainage holes! Condensation will quickly build up in the casing, which could lead to mold or leaks. You can easily drill a small drainage hole yourself, but I can’t recommend doing that if you care about the warranty.

Homelabs also has higher BTU models, ranging from 6000-14500 BTU.

Related Article: Homelabs AC Units

Feature

Details

Energy Efficiency

11.1 EER

BTU Rating

6,000

Weight

44 lbs

Dimensions

15.6" x 18.6" x 13.4"

Coverage Area

250 sq. ft.

Warranty

1 year


7. TOSOT Aovia GPC05AP

Non-Stationary Window Air Conditioner

4.2

Overall Score


Energy Efficiency

4.0

Current Progress
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Cooling Ability

4.0

Current Progress
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Value For Money

4.5

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Pros
  • Works with almost any window opening
  • Small and light unit
  • Auto-evaporation
  • Good value for money
CONS
  • Loud-ish
  • Power-hungry
  • Temperamental thermostat

Not everyone can or wants to install a stationary window air conditioner. If you’re in this crowd, the Tosot Aovia portable air conditioner can still supply you with cool air.

The Aovia works with both vertically and horizontally opening slider windows. The window panel for the duct can extend from 9” to 62”, which makes it fit practically any window. You can even attach it to a casement window if you have something to block the remaining openings.

In terms of power and features, this portable air conditioner doesn’t pale in comparison to any stationary units I’ve listed. It matches the Keystone and Koldfront units in BTU, although it can’t go over its 250-square-foot coverage rating, unlike those units.

It also has a timer and a dehumidifier, three fan speeds, and a Sleep mode. In other words, the Aovia is a full-fledged window air conditioner. I wish it had an Energy Saver mode since this unit has the lower energy efficiency rating on my list. Then again, portable air conditioners will never beat stationary ones in this department. 

My biggest issue with portable air conditioners is drainage, but the Aovia resolves that problem with an auto-evaporation function. Unless you live in an extremely humid area, the AC disperses all condensation to keep its running parts cool. Less maintenance, more cooling!

The thermostat isn’t the most accurate, so the device can cycle on and off seemingly whenever it feels like it. You can try to mitigate that by turning the temperature setting up or down.

Feature

Details

Energy Efficiency

2.6 EER

BTU Rating

8,000

Weight

59 lbs

Dimensions

11.1” x 12” x 27.2”

Coverage Area

250 sq. ft.

Warranty

1 year


Sliding Window ACs Compared

Preview

Name

Rating

BTU

Dimensions

Price

FRIGIDAIRE FFRS1022R1 10000 BTU 115-volt...

Frigidaire FFRS1022R1

4.5

10,000

23.5” x 14.2” x 20.2”

FRIGIDAIRE FFRS0822S1 8000 BTU Heavy-Duty...

Frigidaire FFRS0822SE

4.4

8,000

14.2” x 23.5” x 20.2”

Koldfront CAC8000W 8000 BTU 115V Casement Air...

Koldfront CAC8000W

4.4

8,000

23.5” x 14.5” x 20.9”

PerfectAire 10,000 BTU Slider Air Conditioner...

PerfectAire 3PASC10000

4.3

10,000

23.5” x 14.8” x 21”

Keystone 8,000 BTU Slider Casement...

Keystone ‎KSTAW08A

4.2

8,000

23.5” x 14.57” x 20.9”

hOmeLabs Window Air Conditioner 6000 BTU -...

Homelabs

4.2

6,000

15.6" x 18.6" x 13.4"

TOSOT 8,000 BTU Air Conditioner Easier to...

TOSOT Aovia GPC05AP

4.2

8,000

11.1” x 12” x 27.2”


Horizontal Vs Vertical Sliding Window ACs Explained

I know shopping for a sliding window air conditioner can be confusing. These air conditioners have many names, like horizontal and vertical window ACs and casement window AC units.

What’s the difference? It all comes down to shape. 

A horizontal AC, or horizontal window AC, is your typical sliding window air conditioner. These units are wide rectangular boxes that fit a classic double-hung window that (confusingly) slides vertically, or a crank window that opens upwards.
A vertical air conditioner, or vertical window air conditioner, is a narrow and tall window AC unit. This shape allows them to mount to horizontally-opening slider windows where a traditional horizontal AC won’t fit.
Finally, casement window air conditioners are the same as vertical window AC units. You can install these machines into casement windows that open on hinges. You just have to remove the glass panel before installation.

In a nutshell — horizontal ACs are for vertically-opening windows, while vertical AC units are for horizontally sliding windows. I know, I too wonder who came up with these terms.


How To Find A Quality Air Conditioner For A Sliding Window

So, you’re looking for an air conditioner for sliding window installation. How do you know which of the many units on my list can keep your home cool?

I’ve broken down the most important consideration below to help you make your choice.

Cooling Power Vs. Area Coverage

The power of a casement air conditioner is rated in two ways — British thermal units (BTU) and coverage area. A higher BTU translates to a larger coverage area. [1]

I recommend looking for casement air conditioners with an 8,000 BTU/350-square-foot rating.

The ultimate choice depends on the size of the room you want to cool, though, so it’s a good idea to carefully measure it.

Size & Weight Of The Unit

Take measurements of the window you want to install your sliding window air conditioner to before you start shopping.

Most air conditioners for windows come with covers to block any remaining window openings, but I advise buying a unit that’s as close to the size of the window as possible.

Vertical window air conditioners are also typically heavier than horizontal ones. If the unit you want doesn’t come with a full installation kit, have some wood blocks handy to prevent the AC from crushing your window rails.

Location Location Location

Aim to place your slider window air conditioner in a shaded window without any trees or other obstructions within two feet.

Direct sunlight can overheat the air conditioner and reduce its effectiveness, while trees or bushes can impede proper airflow.

Also, remember that most AC units only have six-foot power cords. You should never use an extension cord with a window air conditioner, so choose a window that has a nearby wall outlet.

Look For Filtration/Dehumidification

I recommend choosing a sliding window air conditioner with an advanced filtration system, like one of the Frigidaire units.

Proper filtering (ideally antibacterial) prevents your AC from drawing contaminants indoors and maintains high air quality, which is particularly important if you live with breathing conditions as I do.

If you live in a humid region, it may be worth picking an air conditioner with a dehumidification function. This can help maintain healthy indoor humidity levels and prevent dust mites and mold growth. [2]

Energy Efficiency Matters!

Try to find a window air conditioner with the highest possible energy efficiency ratio (EER) rating.

This rating is simple to understand — the higher the EER number, the more efficient the unit is.

I would aim for an EER rating of at least 11, like on the Koldfront and PerfectAire units. If the AC has an Energy Star certificate, that’s just further proof that it won’t drain your wallet. 

Noise Levels (Decibels)

There’s no such thing as a silent window air conditioner, but some units are quieter than others.

My recommendation is to look for an AC with a running noise of around 50 dB, like the Koldfront or TOSOT.

This noise level is about equal to a regular conversation and isn’t too distracting during normal life (except maybe in the bedroom). [3]

Ease Of Installation & Maintenance

I would pick a unit that comes with a full installation kit, like the PerfectAire.

Vertical AC units can be really heavy and installing them is usually a two-person job. Having mounting frames and other parts custom-made for your unit can make fixing the unit to the window sill much easier.

Window AC filters should be replaced or washed once a month. Find a unit with washable filters so you won’t have to buy new ones as often.

When you change the filter, it’s smart to clean the cooling coils at the same time — they’re usually right under the filter and you can use a brush vacuum to get rid of any dirt.

Warranty (1 Year Plus)

Choose a sliding window air conditioner with at least a one-year warranty.

All of the units I’ve listed have a year-long warranty or longer, just in case something goes wrong with the unit. Yet, it’s still worth comparing the fine print.


Comparing Sliding Window With Other AC Types

Type

Max Room Size

Most Common BTU

Dehumidifier
Included

Running Costs

Price

Sliding Window

450 sq. ft.

8,000-10,000

Yes

$21 per month
(8,000 BTU)

$$

Fixed Window

450 sq. ft.

10,000

Yes

$29 per month
(10,000 BTU)

$

Thru-The-Wall

550 sq. ft.

12,000

Yes

$38 per month
(12,000 BTU)

$$$

Portable

350 sq. ft.

8,000

Yes

$21 per month
(8,000 BTU)

$

Central AC

Whole House

36,000

No

$75+ per month (36,000 BTU)

$$$$


People Also Ask (FAQs)

Is it safe to use extension cords to run sliding window air conditioners?

Using extension cords with sliding window air conditioners is generally not safe. All extension cords can’t handle their high power consumption and could pose a fire hazard.

How do I determine which sliding window AC to get based on my apartment size?

Look at the BTU rating and square footage to determine which sliding window air conditioner you should buy. Measure your apartment and pick accordingly. Remember — 8,000 BTU is enough for 350 square feet!

Can I Put an AC Unit in a Horizontal Sliding Window? 

You can install an AC in a horizontally sliding window, but you must buy a specific type of window air conditioner. Confusingly, these units are called vertical or casement window air conditioners, because they’re tall and narrow — which makes them vertically bigger than regular window ACs.

Can I mount a standard AC on a sliding window?

You can mount a regular window air conditioner on a horizontally sliding window if the unit fits in the window frame. You’ll have to make a DIY frame to block the large window opening, which may decrease the unit’s efficiency.

Can I Install a Portable AC in a Casement or Sliding Window? 

Yes, you can install a portable air conditioner in a casement or sliding window using the same duct panel you’d use with a double-hung window. You may have to use some duct tape to secure the panel, but they work all the same whether mounted horizontally or vertically.

Is a Window Air Conditioner Installed From The Outside Or Inside? What Holds The Unit In Place?

Window air conditioners are installed from the inside of your home. They are held in place by brackets and a support platform. Some manufacturers provide full installation kits with their window AC units, but others require you to purchase installation components separately.

How can I fill in the gap left between the unit and the upper window frame?

Most window AC units come with an accordion panel and foam strips to cover the gap left behind by the installation. If your window air conditioner didn’t come with a panel, you can buy cheap foam insulation board at a hardware store, cut it into shape, and attach it with duct tape. 

Do I need a professional HVAC technician to install a sliding window air conditioner?

You don’t need an HVAC professional to install sliding window air conditioners. If you can’t lift the heavy AC units, though, you may need someone to help you. I also recommend checking with HOA, landlord, or any other relevant authority whether you’re allowed to install window ACs, especially if you rent.

Can I Use an AC Without Putting It in a Window?

ou can use a window air conditioner without putting it in a window if you can build an exhaust and water drainage system for it. Many portable air conditioners can also be run without window installation. However, this will often compromise their cooling efficiency, so I don’t recommend it.

Can I Install an AC in a Sliding Door?

You can portable air conditioners in sliding doors and many manufacturers offer extra-large duct panels made specifically for doorways. You can theoretically also install a window air conditioner in a sliding door, but the hassle and lower efficiency aren’t often worth it.

Summary - What To Buy?

Buying a sliding window AC unit can be complicated — but it doesn’t have to be. With my list, you can now easily compare the best casement window air conditioners and choose one that works for your windows and home.

To make the choice even easier, here are my Top sliding window AC recommendations:

My #1 Recommendation
Frigidaire FFRS1022R1

  • Powerful cooling performance
  • Plenty of user modes and options
  • Remote control operation
  • Simple usability
  • Washable antibacterial filters

References: 

  1. https://www.totalhomesupply.com/air-conditioner-btu-calculator
  2. https://www.epa.gov/mold/mold-course-chapter-2
  3. https://hearinghealthfoundation.org/decibel-levels
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Josh Mitchell

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Josh Mitchell
My name is Josh and I am obsessed with home appliances. From portable AC units to heaters and air purifiers, I enjoy testing, learning and using these devices to improve the air quality inside my family home.

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