Best Windowless Air Conditioners of 2020 – Honest Reviews

| Last Updated: April 5, 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

  • Best Overall Windowless AC
  • 10,000 BTUs of Cooling Power
  • Suitable for 150-250 Sq. Ft. Room
View Latest Price →Read Customer Reviews
  • Best for the Money
  • Ideal for 350-450 Sq. Ft. Rooms
  • 10000 BTU/ 5500 BTU Cooling Capacity
View Latest Price →Read Customer Reviews

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.

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 whether you need an air purification function in your windowless air conditioner.


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.

Quick Take: Best Windowless Air Conditioners

These are our recommendations for the best windowless air conditioners:

  1. BLACK + DECKER 10000 BTU Portable Air Conditioner Unit
  2. Honeywell MN10CESWW

Reviews of the Best Windowless Air Conditioners

Below are this year's top windowless air conditioners:

BLACK+DECKER BPACT10WT Portable Air Conditioner, 5,500 BTU DOE (10,000 BTU Ashrae), White


  • Easy to Install and Set Up
  • Reusable Washable Filter
  • Strong Fans for Fast Cooling Effect
  • Multifunction (Dehumidifies and Cools)
  • Operates Quietly Qith 75dB on High Setting
  • Compact and Portable-Is Suitable for Small Rooms
  • Remote Control Meaning You Can Operate From Anywhere in the Room


  • Bright Blue Display Lights are Too Bright
  • Sliding Windows Panels Aren’t Sturdy Enough

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.

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


  • Highly Portable
  • Energy Efficient
  • Powerful Cooling
  • Quiet Operations
  • Easy to Wash and Clean Filters
  • Easy Storage and Maintenance
  • Feather-Touch Display and Control Panel


  • Bad Warranty Support
  • May Produce Loud Noises

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.  

Honeywell HL10CESWW Contempo Series, 10, 000 BTU, Portable Air Conditioner, White/White


  • Easy Storage
  • Energy Efficient
  • Quiet Operation
  • Bucket-Less Design
  • Lightweight and Compact
  • Washable Filters for Easy Maintenance


  • Installation Issues
  • Some Quality Control Issues

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.

LG LP0817WSR 8,000 BTU White Portable Air Conditioner - Rooms up to 200 Sq. Ft


  • Affordable
  • Highly Portable
  • Oscillating Air Vent
  • Sleek Attractive Design
  • Doesn’t Cool Large Spaces
  • Remote Operation of Controls
  • Suitable for Cooling a Small Room


  • Pretty Noisy
  • Small Internal Water Tank Which Requires Constant Drainage

The LG LP0817WSR air conditioner is one of the best windowless ACs for those moving either from room to room or home to work. This unit comes in the third on our list, not just because of its sleek attractive design but also because of several effective features.

The auto evaporation system provides continuous air conditioning. However, it can be controlled by integrated 24-hour on /off timer where you are able to control the temperature to your specification.

The LG LP0817WSR AC uses a standard 115-volt electrical outlet allowing to perform effectively, just like other models above.

The best part of this model is the oscillating air vent technology which ensures complete and efficient cool air circulation to the point of no hot air left unnoticed.

Apart from just cooling rooms up to 159sq. ft., it also dehumidifies up to 1.8 pints of liquid per hour. Its maintenance is quite simple with the help of an idicator that notifies you when you need to drain water.

Bottom Line

This model is a suitable choice if you are looking to invest in an affordable windowless air conditioner for smaller rooms or when you're on the go. It provides sufficient air conditioning when placed upright. It is well-designed with desireable features which enhance its cooling performance and fits well in the room.

Honeywell MO10CESWK Compact 3-in-1 Portable Air Conditioner w/ Remote Control, Up to 450 Sq. Ft., White/Black


  • Saves Money
  • Energy Saving
  • Highly Portable
  • Quiet Operation
  • Fast and Easy Installation
  • Easy Storage and Maintenance
  • Washable Filter and Filter Change Alert


  • Condensation Might Not Evaporate

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 best windowless air conditioner available on Amazon for its impressive performance and energy efficiency. Also, it is highly portable and eliminates the struggle of heavy lifting.

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.

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.


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.

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.

How to Drain Water From a Windowless Air Conditioner?

To drain water from a windowless air conditioner, you have to follow this procedure. 

  1. Locate the drainage outlet at the base of the windowless air conditioner unit. 

  2. Now, place a small container under the drainage outlet and pull out the plug. 

  3. Let all the water drain out into the container and dry the outlet valve with a soft cloth. 

  4. Reinsert the drainage outlet once you have dried it off completely.

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 Does a Windowless Air Conditioner Work?

Windowless air conditioners work with the help of three main parts: a compressor, a condenser, and an evaporator. The cooling effect starts when hot air enters the compressor in a gas form. Eventually, gas pressure increases, which forces itself to the condenser.

Once there, the gas cools significantly and leaves the condenser as a liquid. In the evaporator, the liquid turns to gas and takes in heat from the air releasing cooled air to the surrounding. This process continues with the control of the thermostat.

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.