Smallest Through The Wall Air Conditioner

A small through-the-wall air conditioner is a unit installed into a building wall and can cover large areas depending on your ambient room conditions. They are especially suited for cooling living rooms, offices, bedrooms, or apartments. 

There’re multiple reasons why anyone can opt for the smallest through-the-wall air conditioner. It could be that they reside in a small room and don’t want it freezing in there, or perhaps they only aim to cool a specific area. Whatever the case, your utmost desire is to stay cool during the humid summer months. 

While staying relaxed and comfortable all summer long is presumably a god-given right especially for those who are lucky enough to live in rooms where opening the window will do a decent job, most of us still rely on good air conditioning to save the day. The smallest through-the-wall air conditioners provide you the relief you need to deal with temperatures that reach triple the digits.  

Getting down to basics, here are the five smallest through-the-wall air conditioners that are relatively durable, equipped with up-to-date features, reliable, and offer the best cooling power. 

Things to Consider When Choosing a Small Through the Wall Air Conditioner

Energy Efficiency

Energy-efficiency is a useful feature as it determines the amount of power that your AC uses. An energy-efficient through-the-wall AC minimizes power loss, thus saving you the headache of paying more electric bills.

With an energy-efficient machine, be assured of a dependable unit and an opportunity to save more power. Furthermore, through-the-wall units are more energy-efficient than other types of AC. All you need to do is take your time to find the correct size to cool your room properly. 

Room Size

The room size is an important feature that determines the size of the AC to buy. A bigger room requires a bigger AC. For instance, a space of 450 sq. ft. requires an AC of around 12000 BTU for efficient cooling. Getting the correct room size will help you settle on an ideal unit that cools the room sufficiently. 

Additionally, the AC size will vary depending on the ceiling height, the shape of the room, and the presence of any destruction. However, if you have a small space, choose a small AC like mini-split air conditioner. 

AC Size

The size of the unit is one of the fundamental factors to consider. It is designated in British Thermal Units (BTU). The size determines how powerful the machine can operate.

The thermal rating is generally used to show how much heat is required to raise one pound of water temperature by one degree. If you have a bigger room, you’ll go for higher BTU ratings and vice versa. 


Different AC models come with various controls. The controls help you to set the unit according to your preference. Some even allow you to use the remote control from your comfort zone.

You can adjust the modes or temperature settings to an optimal level using the controls. However, you’ll find that the more the controls, the higher the price of each model. Anyway, you will get the value for your money based on the AC you choose. 


The fact that the AC you choose can dehumidify the room is one of the best features to settle on. Besides, this feature helps save you more energy bills as these units often have Energy Star Rating.

The energy star rating reduces energy loss while enabling the AC to run at a higher temperature. The feature also helps to remove excess moisture from the room while maintaining a calm environment. 


The displays are good since you can easily observe the temperature levels or other settings and adjust appropriately. More so, if you get an AC with remote control, you can adjust the settings by looking at the LCD without getting up.

Some displays show cool colors like red or blue, which changes the look of the room. These colors are always appealing to the eye. 

Heating Option

Well, air conditioners are not only designed for cooling rooms. Some incorporate the heating option that allows the unit to increase the room’s temperature. This option helps during winters as the room tends to be so cold.

The option is a plus for your AC as you will use it both in summer and winter. The AC is beneficial in both extremities; therefore, you will get value for money. 


The filters are necessary to trap dust particles and allergens that try to find a way through the wall air conditioner. A good filter should be easy to clean as you will routinely clean it for optimal performance.

Besides, the filter should be replaceable. Failure to routinely clean or replace the filter will cause the unit to malfunction. A filter with dust particles will be heavy, thus demands more energy for performance. 

Noise Level

Most of the wall air conditioners are not dead silent, but those that produce much noise are not recommended. Noisy units distract communication and are usually placed outside. However, the through-the-wall unit must be placed inside the house, so silent ones are the best.

The struggle to comfortably hear your TV or music sound while the AC operates at a higher sound is hectic. Furthermore, sleep is healthy and requires a quiet environment; therefore, you need to settle for a quiet air conditioner. 


A good through-the-wall air conditioner should allow you to set various modes of temperature depending on the weather. The modes include dehumidification, fan-only mode, and sleep mode.

These options are all beneficial. Sleep mode allows the unit to switch off when idle. The more the modes, the more advantageous the air conditioner will be. 

Wall Sleeve

The final feature to look for in the smallest through-the-wall air conditioner is the wall sleeve. The wall sleeve supports the air conditioner when mounted and keeps it from contacting the wall’s parts.

The sleeve can be part of the package, or you will be forced to buy it separately, depending on the dealer. The wall sleeves are made differently, so you will have to check if it is compatible with the AC you’ve bought. 

Smallest Through the Wall Air Conditioner

1. Keystone KSTAT08-1C Through-The-Wall Air Conditioner

Our first trusted brand for the smallest through-the-wall air conditioner is this unique masterpiece from Keystone. With 8,000 BTU power and a 10.6 energy efficiency ratio, this piece can efficiently cover areas up to 350 sq. ft. It features a front-access filter that lets you clean that dusty filter with ease. 

Besides, its energy-conscious options include three fan speeds, a programmable timer, and three cooling modes for utmost flexibility. It also enlists an energy-save mode, which conserves energy while helping you save more on energy bills. 

Further, it’s equipped with an auto option that automatically ramps up and down the fan speed keeping the pre-set temperatures constant. 

What’s more, with a thermostat built into the remote control, you don’t have to worry about uneven room temperatures. It also includes foam seals and an installation kit ideal for retrofitting your existing sleeve.  


  • Works great
  • Simple to install
  • Well priced
  • Small yet powerful
  • Reliable
  • Energy-efficient
  • Cool rooms fast


  • Few complaints about insufficient packaging

2. Friedrich Uni-Fit Series UCT08A10A in Wall Air Conditioner

The Fredrich Uni-Fit Series UCT08A10A in Wall Air Conditioner is another small unit that has a lot to offer. With a 6-way airflow control plus 8,000 BTU power, this masterpiece can keep your room cooled down for hours on end. Besides, it automatically exhales stale air, making the air in your room feel clean and crispy.

Its energy star authorized room temperature changer provides quiet and dependable performance that outshines any other AC. Additionally, it’s AHAM-certified and comes with seacoast protection for corrosion resistance, especially in harsh environments.

 Besides, it’s specifically designed to replace virtually any through-the-wall air conditioner cost-effectively and fast. It’s also designed to fit a range of sleeve sizes while keeping you comfortable. It’s highly recommended!           


  • Perfect for small rooms
  • Well-built
  • Works as advertised
  • Well-packed
  • Easy to install
  • Durable
  • Powerful enough


  • A bit heavy

3. Perfect Aire 4PATW8000 8,000 BTU Thru-the-Wall Air Conditioner

This unique, flexible, up-to-date air conditioner makes it easy to replace air conditioners without complicated, time-consuming retrofits.

It’s designed to provide you with all the comfort you need. It incorporates a follow me portable remote control with a thermostat feature for total temperature control. 

What’s more, it’s engineered with electronic controls for easy change between modes. It also boasts a 24-hour programmable timer, slide-out filter, and auto-restart function for easy access.

Its energy-saver operations provide fast, equal, and comprehensive cooling while helping you save on running costs. Its front-mounted reusable air filter slides out for more efficient and easy cleaning.


  • Includes a 1-year replacement warranty
  • Works as intended
  • Simple to install
  • Super efficient
  • Excellent customer support
  • Cools well
  • Fast delivery
  • Fairly powerful


  • A bit squeaky

4. Koldfront WTC8001W Through the Wall Air Conditioner

If you’re looking for a tremendous through-the-wall unit that is super reliable with modernized features, you’ll find the Koldfront WTC8001W 8,000 BTU Through the Wall Air Conditioner a thoughtful choice.

With 8,000 BTU cooling power, this piece can cover spaces up to 300-350 sq. ft. It’s specifically designed for through-the-wall installation and to maximize your comfort during hot, sticky days. 

It incorporates 4-way air directional louvers that ensure air flows in all directions for maximum comfort. Its sleep mode function automatically adjusts the temperatures after every 6 hours, providing you with a calm, serene environment.

Using the remote control function, you can control room temperatures from across the room without leaving your comfort zone.  It works in tandem with a durable through-the-wall sleeve for a more secure fit and keeps pests and allergens at bay.

With an energy-efficiency ratio of 9.6, you can expect to save more on energy bills while staying cool all day long. You’ll find this unit unbelievably flawless and will quickly fill in the inevitable gaps.


  • Works as advertised
  • Powerful
  • Pretty small
  • Simple to install
  • Quieter
  • Requires easy maintenance
  • Reliable


  • It only works great in small rooms.

5. LG LT0816CER 8,000 BTU Wall Air Conditioner

The LG LT0816CER 8,000 BTU Wall Air Conditioner is another smallest through-the-wall air conditioner that will keep you cozy all summer long.

It’s powerful enough to service rooms up to 340 Sq. Ft. Besides, it provides exceptional cooling power that can sustain you and your family during hot, humid days.

Additionally, it’s equipped with an LED display and a simple selection panel for maximum flexibility. It also incorporates three different speeds, fan speed selection and up/down temperature adjustments for maximum comfort.

Its full-featured remote control gives you the liberty to control room temperatures without leaving your comfort zone. With all the features that this masterpiece has to offer, it’s definitely a definite buy!


  • High-quality product
  • Relatively durable
  • Powerful
  • Works as intended
  • Cool rooms super fast
  • Excellent packaging
  • Super stylish and small


  • Slightly costly for some users


Going through our article will help you choose the smallest through-the-wall air conditioner in the market. To extend its service life, make sure you schedule maintenance and service at the right time.

Change the air filter frequently, clean the return air ducts, Check the pipe insulation, keep an eye on ductwork, inspect the wiring, clean the exterior compressor, and don’t overwork the unit. 

If you maintain the above procedure, your air conditioner will work for an extended period while serving you to its best. Best of luck as you settle on an AC of your choice.