Best Windowless Air Conditioners of 2021 – Honest Reviews

| Last Updated: June 23, 2021

The windowless air conditioner has become a popular choice in many homes today especially in an apartment without windows or central air. They are self-contained and very useful since they don’t need ductwork to work.

If you are looking to invest in a windowless air conditioner, then you are in the right place. We’ve compiled some of the best models to select from including a brief overview of each product.

This article will guide you on how to choose an efficient windowless air conditioner that will suit your home needs.

Comparison of the Best Windowless Air Conditioners

IMAGEPRODUCT
  • Best Overall Windowless AC
  • 10,000 BTUs of Cooling Power
  • Suitable for 150-250 Sq. Ft. Room
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  • Great for small spaces up to 150 square feet
  • Comes with sturdy wheels to roll from one room to another
  • 3 energy-efficient settings to suit your needs
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  • Ideal for spaces up to 600 square feet
  • Removable and washable air filter
  • Quick and easy to install in less than 10 minutes
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How to Choose a Windowless Air Conditioner

Before you invest in a windowless AC there is a certain criteria you need to consider. Here are some of the things that will help you determine which kind of model suits your needs accordingly.

Cooling Capacity

This is the main point to consider when you want to buy a windowless AC because it’s the framework that regulates the efficiency of air conditioning. The cooling power of all windowless AC is measured in BTU’s (British Thermal Unit).

The power required will vary depending not only on the size of the room to be refrigerated, but also on other features built-in your home including insulation, sunshine, numbers of openings, and type of ceiling.

Your first task is to measure the size of your room in order to establish the amount of BTUs essential for your space.

For instance:

  • Below 200 sq. feet  requires 5,000 to 8,000 BTU units
  • Between 200-350 sq. feet  requires 10,000 to 12,000 BTU units
  • Between 350-500 sq. feet requires 12,000 to 14,000 BTU units
  • Above 500 sq. feet requires 15,000 BTU  units

In simple terms, the higher the BTUs, the higher the space that can be air-conditioned.

Energy Consumption

This is another critical point because the windowless AC is an electrical device that operates by consuming a lot of energy.  We recommend you find a model that has the least energy consumption rate.

Therefore, look for models with an “Energy Star” rating logo or higher energy efficiency ratio. Generally, a unit with a lower EER rating of five is most definitely consuming more energy than a higher rating of 10 which is more energy efficient.

Remember, to choose a model that is adapted to the size of the space to be cooled since it will consume efficient energy by producing just the required amount of cooling experience.

Noise Level

The noise level of your air conditioner is a factor to consider because nobody desires a unit producing a lot of noise around them.

Recommended noise level ranges are between 55-70 dB for any AC. Above that, the noise may be irritating and disturbing to your eardrums. However, some windowless air conditioners come with a silent or night feature which allows you to enjoy a quiet and cool atmosphere.

BLACK+DECKER BPACT10WT

Dehumidifier Feature

In some models in our list, the windowless air conditioner acts as a dehumidifier which eliminates dampness from the surrounding air, providing freshness to the atmosphere.

The dehumidifier capacity is measured in liters per hour.

Not all models have this feature built-in, so it depends on whether you need an air purification function in your windowless air conditioner.

Thermostat

Having a model with a thermostat function allows you to run your AC for a selected period. In most cases, a windowless AC with integrated thermostat function automatically switches off when the desired temperature is reached.

This feature is advantageous since you are able to control energy consumption and prevent premature wear over those models without.

Review of the Best Windowless Air Conditioners

Below are this year’s top windowless air conditioners:

Best Overall

BLACK+DECKER BPACT10WT

BLACK+DECKER BPP06WTB Portable Air Conditioner with Remote Control, 10,000 BTU, Cools Up to 250 Square Feet, White

Specifications

BTU (DOE): 6,000

Coverage Area: 150 sq.ft.

Dimensions (in): 16.5×11.5×26″

Weight: 52.9 lbs.

Decibel Level: 75 dB

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Review

BLACK + DECKER 10000 BTU Portable Air Conditioner Unit is the best overall unit on our list. It’s one of the best windowless AC since it cools, dehumidifies, and ensures continuous circulation of air even in summer heat.

Its operation is quite convenient with the help of the remote-control feature. This enables you to enjoy cool air by accessing your unit features from anywhere in the room.

In addition to control, there is an LED digital display which provide simple, smooth operation and with a 24-hour off/off timer and sleep mode setting.

Its vertical motion design builds steady airflows, keeping room temperatures consistent over time. A slide out filter also comes in handy as it can be easily cleaned and reused.

With the use of four wheels movement of the unit is made easier. On the flip side though, it only works on double-hung or sliding windows.

Bottom Line

One of the main reasons why people may seek out this unit is its portability. However, it works best in small spaces and for those who want to take cooling from room to room. Above all, it is considered attractive and does not block your view out the window.

Pros

Reusable washable filter

Easy to install and set up

Strong fans for fast cooling effect

Multifunction (dehumidifies and cools)

Operates quietly with 75dB on high setting

Compact and portable- is suitable for small rooms

Remote control meaning you can operate from anywhere in the room

Cons

Bright blue display lights are too bright

Sliding windows panels aren’t sturdy enough

Runner-up

BLACK+DECKER BPACT08WT

BLACK+DECKER BPACT08WT Portable Air Conditioner with Remote Control, 5,000 BTU DOE (8,000 BTU ASHRAE), Cools Up to 150 Square Feet, White

Specifications

BTU (DOE): 5,000

Coverage Area: 150 sq.ft.

Dimensions (in): 16.5×11.5×26″

Weight: 52.9 lbs.

Decibel Level: 75 dB

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Review

This model is advertised as a solution for smaller rooms, trailers, dorms, and cabins. Its functionality includes cooling, dehumidification, and ventilation, covering the main goals you’d want from a system like this.

However, the highlight of the unit is its ability to self-evaporate the condensate that remains after dehumidification. Some portable ACs need an additional hose or a bucket for drainage, but not this one.

It also comes with a window kit both for vertical and horizontal fit.

Bottom Line

BLACK+DECKER’s sleek and convenient air conditioner not only accomplishes efficient cooling of up to 300 square feet but also doesn’t get in the way: not on the floor and not even when you sleep. It’s silent and does its job perfectly. No-fuss.

Pros

Three-in-one functionality

Bucket-less, self evaporating operation

Sleek and compact, suitable for small spaces

Timer and auto-restart function after power surges

65°F in the ideal square footage on the coldest setting

Cons

Issues in extremely hot and humid conditions

Best for the Money

hOmeLabs 14,000 BTU

hOmelabs 14000 BTU Portable Air Conditioner (new CEC 10000 BTU) - Quiet AC Unit Cools Rooms 450-600 Square Feet - with Wheels, Washable Filter, Remote Control and LED Indicator Lights

Specifications

BTU (CEC): 10,000

Coverage Area: 600 sq.ft.

Dimensions (in): 17.9x15x30.7″

Weight: 72.3 lbs.

Decibel Level: 53 dB

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Review

This is a quiet and mobile air conditioner that can cool a room of up to 600 square feet. Although it works well and doesn’t have particular disadvantages, the product description might confuse buyers. The manufacturer changed the BTU capacity of the unit from 14,000 to 10,000.

The unit cools, dehumidifies, and refreshes the room. It has a high-tech control panel with all the functionality visible. Still, if you prefer changing the settings from the other end of the room, you have the fully functional remote in the box too.

Bottom Line

This hOmeLabs Portable air conditioner is a great find for people who have larger rooms and don’t want to go through the mini-split installation process. While the unit might look bulky compared to some other sleeker ACs on the market, it’s a beast when it comes to cooling.

With higher coverage area and automatic swing function, it can be excellent for houses and offices with large open spaces.

Pros

Wheels for mobility

Easy maintenance with washable filter

Auto swing, dehumidification, cooling, and fan-only modes

Easy to control LED panel and remote control for easy setup

Complete installation kit with a window security bracket and adapters

Cons

Bulkier than other units

Lowered BTU from 14,000 to 10,000

Honeywell MO08CESWK

Honeywell MO08CESWK Compact 3-in-1 Portable Air Conditioner w/ Remote Control, Up to 350 Sq. Ft., White/Black

Specifications

BTU (DOE): 4,000

Coverage Area: 250 sq.ft.

Dimensions (in): 13.5×14.6×27.7″

Weight: 43 lbs.

Decibel Level: 53 dB

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Review

When looking for a compact portable air conditioner to make your room cool and dry at all times, the Honeywell MO08CESWK AC is the best you can find. It’s built to last and offer you peace of mind whenever in operation. It also provides a powerful flow of air and operates quietly with minimum distractions.

The product comes with a dual washable air filtration system that shields and prolongs its life. The system also includes a filter change alert for easy maintenance.

Its motor and compressor have thermal overload protection to provide extra safety precautions.It incorporates a dehumidifier that eliminates up to 44 pints per 24 hours and a continuous drain option for long unattended periods. It also has a digital and remote control, two variable speed fans, and 24-hour energy saving timer.

Another great feature is the auto evaporation. This eliminates the need for a bucket to empty except in high humidity regions.

It has an exhaust hose length of 12” to 47”. For ease of installation, the product has a window bracket with a width of between 19.7” to 47.2”.

Bottom Line

The Honeywell MO08CESWK is considered the one of the best windowless air conditioners available on Amazon for its impressive performance and energy efficiency. Also, it is highly portable and eliminates the struggle of heavy lifting.

Pros

Saves money

Energy saving

Highly portable

Quiet operation

Fast and easy installation

Easy storage and maintenance

Washable filter and filter change alert

Cons

Condensation might not evaporate

Honeywell HL10CESWW

Honeywell 10000 Btu Portable Air Conditioner, Dehumidifier & Fan for Rooms Up to 350-450 Sq. Ft with Remote Control, HL10CESWW

Specifications

BTU (DOE): 5,500

Coverage Area: 450 sq.ft.

Dimensions (in): 18.9×15.7×31.3″

Weight: 66.2 lbs.

Decibel Level: 49 dB

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Review

The Honeywell HL10CESWW Contempo Series is among the most powerful and stylish portable air conditioners available in the market today. It is very dependable as it combines a 3-in-1 technology with a sleek design that complements any room decor.

When it comes to cooling, Honeywell HL10CESWW Contempo Series has an automatic wind motion that is vertically placed to distribute cool air evenly, fast, and consistently.

The whole system has been designed to offer maximum comfort.

It incorporates digital controls, sleep mode option, three fan speeds, a digital display remote control, and a 24-hour energy saving timer.

This product has reusable dual filters that are structured to offer protection against hair, pet dander, and dust entering the unit. This feature prolongs product life and functionality.

It includes stress-free automatic evaporation. It also has an in-built dehumidifier that gets rid of up to 80 pints per every 24 hours with an ongoing drain option for long durations when the system is unattended.

Another impressive feature for this product has full set window kit for fast installation in horizontal and vertical windows. However, it has a maximum hose length of four feet.

Bottom Line

When it comes to room cooling, this unit is specifically designed to provide consistent functionality and efficacy. It has been built with high-quality standards to ensure durability and extended product life.

Pros

Easy storage

Energy efficient

Quiet operation

Bucket-less design

Lightweight and compact

Washable filters for easy maintenance

Cons

Installation issues

Some quality control issues

Honeywell MN10CESWW

Honeywell MN10CESWW Environmental Appliance, Rooms Up To 350-450 Sq. Ft, White

Specifications

BTU (DOE): 5,500

Coverage Area: 350 sq.ft.

Dimensions (in): 5.2×18.1×29.4″

Weight: 64.2 lbs.

Decibel Level: 65 dB

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Review

Are you looking for windowless AC that is ideal for your money? The Honeywell MN10CESWW is a portable air conditioner that offers modern designs that complement all room décor. It has a sleek modern design that makes it very appealing.

This product is very dependable, powerful, and safe to use. It is a 3-in-1 appliance offering a powerful cooling, dehumidifier up to 66 pints per 24 hours with the option for continuous drain, and a fan that is responsible for air circulation in the room. It also has thermal overload protection for extra safety.

This product is easy to install and maintain. It comes with a full set window kit that allows for quick installation. The maximum hose length is four feet.

Besides, its filters are washable and structured to protect against dust and hair for extended performance and durability.

Bottom Line

If you are working on a budget and need to feel the value for your money, the Honeywell MN10CESWW AC is your best fit. It’s affordable and is high performance to cool your room fast and consistently.  

Pros

Highly portable

Energy efficient

Powerful cooling

Quiet operations

Easy to wash and clean filters

Easy storage and maintenance

Feather-touch display and control panel

Cons

May produce loud noises

Windowless AC Comparisons

This section compares a few terms to get a better idea of what the best windowless air conditioners are and how their power capabilities are measured.

Window Air Conditioner vs Windowless Air Conditioner

While it’s a matter of preference, there are a few differences between window air conditioners and windowless ones.

If we compare a window air conditioner to both portable or wall units, the most glaring difference is that the latter don’t block a window entirely. You can still use it if a portable unit is vented through.

Window units might be noisier than ductless mini-split indoor units, but they’re making about the same amount of noise as portable ones.

In terms of efficiency, portable ones are the worst in the bunch. The longer the exhaust hose, the more heat it emits back to the room. On the other hand, mini-split systems are the most efficient if the rest of the house is adequately insulated.

In the price category, window units are somewhere in between the two mentioned types as well. They also save more money than portable ones long term.

BTU vs CFM – What’s the Difference?

British Thermal Units (BTU) is the cooling capacity of the AC in terms of how powerful the coils are. You always view it relative to the room size the air conditioner is going to affect. The measurement tells how cold the air can get if it passes through the unit.

On the other hand, Cubic Feet Per Minute (CFM) is the volume of air that can go through the AC, regardless of the cooling capacity.

A larger BTU doesn’t necessarily mean a larger CFM.

Top Brands in Windowless Air Conditioners

There are many brands based in the USA and overseas that can boast the best windowless air conditioners. Still, we usually mention those with at least a couple of decades under their belt, unless the entry has constantly gotten customer satisfaction in recent years.

In this article, the top mentions for windowless air conditioner brands are the following.

Pioneer

Pioneer Electronics is a Japanese corporation that manufactures everything from car parts to headphones. Pioneer HVAC is a Miami-based brand that produces a range of air conditioner lines, including ductless, central, and multi-zone solutions.

Black + Decker

Although this brand hasn’t initially been an AC-specified one, it’s keeping up in popularity with other name brands like Honeywell and Keystone. Black + Decker grew from a small Baltimore machine shop. To this day, the brand provides convenience to your home in many of its domains.

It produces small kitchen appliances, power tools, garden equipment, and much more. Portable air conditioners are one of the highlights of this company. You can feel the level of care towards the customer and environment in every product. 

Windowless Air Conditioner Price Points

If you’ve decided to opt for a windowless air conditioner, you have many options, depending on your needs. Below is the whole gamut of prices for all AC types that don’t need to occupy a window. 

$10 – $70

These are small and lightweight units, only a couple of pounds in weight, serving as personal space cooling gadgets. They usually have a charging port that connects to your laptop or a power bank.

Most models double down as humidifiers, as they have a water tank. You fill it up with tap water (it’s even possible to add ice to it for better effect) and turn it on. The mist evaporates and cools the few feet around the gadget.

$200 – $6,000

Although the price for portable air conditioners can go up to $25,000, the higher-end models are industry-grade and don’t fit into household use. Usually, 24,000 BTU units can cost up to $6,000.

Most commercial models have multiple functions like heating, cooling, and dehumidification. They come with window kits for straightforward installation and don’t need a technician for setup.

BLACK+DECKER BPACT08WT

$350 – $5,000

Ductless wall-mounted units usually have a cooling capacity between 5,000 and 24,000 BTU for residential spaces. The range depends on functionality, technological advancement, and installation cost.

Some large-capacity mini-split units can accept up to eight indoor units connected to one outdoor system. This setup can substitute a whole-house solution.

$2,500+

The last and most obvious one is the central air conditioning option. If you’re up for a thorough approach to the heating, cooling, and ventilation situation in your home, this is the priciest and most fundamental choice.

At the same time, with the last option, get ready for some serious construction work.

Who Should Not Buy a Windowless AC?

While a decent windowless AC can make your home a better place, it can also pose a few risks. Let’s go through some of the disadvantages and see who shouldn’t buy one.

If Your Family Members Have Health Issues

While this is a general argument against air conditioners, we needed to include it in the list, as it also speaks to windowless units.

If your family members suffer from chronic respiratory problems, bronchitis, or mucus infections, any AC can cause problems. Allergic reactions and fungi development are also possible. The same goes for a toddler exposed to the coolness of an air conditioner.

If the Only Efficient Option is the Window Unit

While wall and portable ACs can be efficient in some cases, they aren’t always the go-to option for some spaces. Suppose you own an RV or a food truck. You, obviously, cannot install a wall-mounted AC, and the bulky portable one would get in the way. 

Wall-Mounted Units for Rented Apartments

If you’re renting a small apartment, you might have a problem installing a wall unit. Check the occupancy agreement to be on the safe side. On the other hand, your space might be so small that shoving even a sleek portable unit with its exhaust hose might be challenging.

If a Whole House Solution is More Efficient

If you own a large country house and heating or cooling only one room is going to cost a fortune, it’s better to plan on installing a central HVAC system. 

With this holistic solution, you’ll be able to keep the house warm during winter and cool during summer.

Floor Plans With Many Walls

While using a windowless AC might be efficient for open-floor apartments, they don’t work with spaces that have many walls. As the appliances are designed to cool one room at a time, they won’t be too efficient.

Are All Windowless Air Conditioners The Same?

Of all five windowless air conditioners, it’s quite clear there are both similarities and differences in every model.

However, there is a lot to consider when it comes to windowless air conditioner units which include dehumidification, BTUs, hose assembly, the technology used, and the overall design.

The BLACK + DECKER 10000 BTU Portable AC Unit is probably the best overall unit for fast cooling, dehumidification, and consistency in terms of air circulation. It’s also the most affordable and simple to operate unit.

The Honeywell HL10CESWW Contempo Series provides similar functionalities with a slight improvement of auto evaporation. However, both models pose challenges in quality control.

The Honeywell HL10CESWW Contempo Series is a suitable choice for bigger rooms with a stronger focus on visual design, while the LG LP0817WSR unit, despite its oscillating air vent, produces a lot of noise.

Above all, each of the reviewed windowless AC units can work to suit your situation by providing cool, comfortable, and refreshing air.

Perks of Investing in a Windowless Air Conditioner

There are many benefits that come with investing in a windowless air conditioner listed above. They include:

High Portability

Most of these units are compact and light for easy movement from one room to another.

Occupy Small Spaces

Compared to window air conditioners, these units need little space. They are also ideal for small apartments or studio.

Photo credit: thesoothingair.com

Both Cool and Dehumidify the Air

The 2-in-1 feature acts as an air conditioner and dehumidifies air at the same time.

Easy Installation

All you need is to identify the perfect location, then fix a drain hose downhill, then you’re done.

Energy Saving

Most of them come with thermostat and night mode settings which ensure the AC runs only when needed.

Conclusion

It is important to consider all the factors that will guide you in selecting the best windowless ACs on the market. Not all of the above will suit your needs, therefore, evaluate your room requirements and have a budget.

To conclude, when choosing your desired windowless air conditioner, find one that is worth your money in terms of performance and efficiency.

People Also Ask

Our aim is to help you understand more about windowless air conditioners as we strive to answer some of the most frequently asked questions in order to clear any doubts.

Windowless air conditioners have rapidly gained popularity. And now, most people who buy an air conditioning unit prefer windowless air conditioners. This has led to an increase in queries regarding these units, which we have answered here to clear all confusion.

How Often Does The Filter Need to Be Changed on a Windowless AC?

Windowless air conditioners have two types of filters—those that need to be changed and washable ones that you can use indefinitely. Usually, the user’s manual will indicate the wear-and-tear period.

The general rule of thumb is a couple of months for the changeable filters and regular maintenance (once in a couple of weeks) for washable ones.

How Do You Vent a Window Air Conditioner Without a Window?

If you don’t have a window venting option, you can DIY your way out of the situation. A few possibilities for venting your window AC through a wall, the ceiling, and even a sliding door are available. However, make responsible choices to avoid hazardous situations.

Can a Windowless AC Cool a Whole House?

It’s a stretch to say that this type of AC will cool the whole house. Unlike central HVAC systems, windowless air conditioners aren’t designed to cool more than one room. However, it might if you own tiny home with only a couple of rooms with a relatively open plan.

In this case, you also need to size the AC properly. While wall-mounted units are fixed, portable ones will serve a few rooms.

Is It Safe to Leave a Windowless AC on All Day?

Technically, it shouldn’t cause any hazards if everything is mounted and vented correctly. For some users, it’s the key to energy efficiency. With more modern units, the thermal sensors self-regulate so that the room won’t get too cold.

The best windowless air conditioners have the auto-restart feature that brings them back to the latest setting, which is also helpful if there’s a power surge.

What is a Windowless Air Conditioner?

A windowless air conditioner is an air conditioner that does not need a window for installation. Its installation kit is able to support its own weight. So, it can be mounted on a wall directly. So, you do not need to have a window in your room to install it at all. 

How Does a Windowless Air Conditioner Work?

Windowless air conditioners replace the hot air inside a room with cold air. They take in the air from the surroundings and cool it down to the temperature you desire. Then they redirect the air back to your room, and the hot air passes out through the outdoor unit.

What Size Room Does a Windowless Air Conditioner Cool?

These windowless units can cool a variety of rooms according to their sizes. For a 400 square feet room, you will need a 12,000 BTU air conditioner. But, for small rooms like those around 250 square feet, a 6,000 BTU air conditioner will work fine. 

How to Hook up a Windowless Air Conditioner?

In order to hook up a windowless air conditioner, you have to follow these basic steps.

1. Unpack the windowless air conditioner and set it on the desired position. 

2. Then you have to measure the width of the venting hose of the air conditioner.

3. Once you have taken this measurement, cut the required piece of glass or plastic from the window and insert the hose in it. 

4. Now attach the other side of the hose to your air conditioner, and you are good to go.

Are Windowless Air Conditioners Good?

Yes, they are perfect AC units depending on your situation. Most of them are portable and you can easily move them around from a room to another as you wish.

How to Drain Water from a Windowless Air Conditioner?

Follow these steps:

1. Find a drain bucket or move the unit close to a sink.

2. Find the drain plug either on the side or back of the unit.

3. Drain the water by removing the drain plug and stopper. However, once the drain plug is removed, remember to set up the drainage for continuous drainage.

4. Measure the drain port mouth and get a hose of exact width to ensure a water-tight fit.

5. Place your drain hose in the proper position (downhill) for it to be effective.

6. Note that in order to support continuous drainage gravity must apply.



My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.