The best wall-mounted split air conditioners in the UK 2023

Even if you love the summer sun, the summer heat can tire you out quickly. If you want to stay cool in your home, you should consider a split wall air conditioner. But today, there are so many models that it's hard to choose. To help you, here is a buying guide where you will find a selection of the best wall split air conditioners.

Daikin Sensira FTXC35B 1

Editor's Choice

Daikin Sensira FTXC35B

The best wall split air conditioner in 2021

How could we do a wall air conditioner comparison without talking about Daikin? With a power of 3.5 kW in heating and 12,000 BTU in cooling the Daikin Sensira FTXC35B is a must.

426 £ on Manomano

Daikin is the gold standard when it comes to wall mounted air conditioners. And for this year, what better than the Daikin Sensira FTXC35B to open this comparison? This is one of the latest wall-mounted air conditioners released by the Japanese giant. It features self-diagnosis, 24-hour timer, maximum power mode, energy saving mode (reducing consumption to 30% per year), comfort mode that prevents air from blowing directly at people's height and many others.

Particularly quiet, the Daikin Sensira FTXC35B emits only 20 dB(A) in night mode. It delivers 3.50 kW of heating power and 3.30 kW or 12,000 BTUs of cooling power. Note that this wall-mounted air conditioner is suitable for different environments: homes, offices, hotels, etc. Thanks to the vertical oscillation of the exhaust deflector and the 5-stage speed control, it can distribute the air evenly and constantly.

Haier Geos Plus 2

Best entry-level

Haier Geos Plus

The best entry-level wall split air conditioner

Haier introduces its new Geos Plus wall air conditioner with R32 refrigerant. Thanks to the Intelligent Air function, it ensures a more uniform air distribution. Given the price, it will be perfect for small budgets.

392 £ on Manomano

While the Japanese are the undisputed masters of air conditioning, the Chinese dominate the world market with their low-cost units. In this sense, the Haier Geos Plus is primarily aimed at those looking for an efficient wall-mounted air conditioner at a low price. This one offers a nominal capacity of 3.2 kW or 12,000 BTUs in cooling and 3.4 kW in heating. The unit operates on a single-phase power supply of 220-240 V / 50 Hz.

Surprisingly at this price, it is a fairly quiet wall-mounted air conditioner, with a sound pressure level of 38 dB at the lowest speed and a sound power rating of 56 dB. The Intelligent Air feature automatically adjusts the air conditioner's louvers to better distribute the airflow according to the set mode. In air conditioner mode, the louvers direct the airflow upward. The cool air flowing downward lowers the room temperature evenly and quickly. In heating mode, the louvers direct the airflow downward.

Klarstein Windwaker Eco 3

Best high-end

Klarstein Windwaker Eco

The best high-end wall split air conditioner

The Klarstein Windwaker Eco series is best known for its self-cleaning function. The model presented here has an A+ energy efficiency rating despite its phenomenal cooling power (24,000 BTU).

719 £ on Amazon

The 24,000 BTU version of the Klarstein Windwaker Eco is impressive in more ways than one. First of all, this power allows it to cool the air in very large rooms, up to 117 m². We are also speechless because of the A++ / A+ energy class of the device, never seen at this level. To put it simply, this wall-mounted air conditioner has the energy-saving function while ensuring lightning temperature drops in the room. And at maximum power, the noise level is only 67 dB.

Apart from its air cooling performance, this reversible wall air conditioner has a heating capacity of 6.9 kW. With 6 fan speeds, 3 night modes and horizontal and vertical oscillation, the Windwaker Eco will adapt to everyone's needs. And how can we not mention the self-cleaning function, which makes life easier for users? Note the airflow of 1250 m³/h in cooling mode.

Mitsubishi MSZ-DM35VA 4


Mitsubishi MSZ-DM35VA

Excellent wall split air conditioner

The Mitsubishi MSZ-DM35VA is a reversible wall-mounted air conditioner with an A+ energy class. It uses an inverter compressor for its refrigerant gas, while offering a good quality/price ratio.

560 £ on Amazon

Ideal for use in a room as large as 40 square meters, this 12,000 BTU reversible wall-mounted air conditioner features a wide-angle airflow system, as well as an automatic swivel vane, allowing you to extend the airflow to all corners of a room. Designed to heat or cool, the Mitsubishi MSZ-DM35VA offers a versatile yet affordable air conditioning solution.

Indoors, the maximum sound level is 52 dB. The unit runs on R410A gas and has an A+ energy rating in both cooling and heating modes . Unlike conventional models with a grilled air intake, the Mitsubishi MSZ-DM35VA has a flat panel finish with smooth contours. There is also a top air intake that not only improves aesthetics, but also helps reduce operating noise.

Buying guide • November 2023

Best split wall air conditioner

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The best wall split air conditioner in 2021

The best entry-level wall split air conditioner

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Comparison table of the best wall-mounted split air conditioners

The best Inexpensive Top of the line Excellent
Daikin Sensira FTXC35B 5
Haier Geos Plus 6
Klarstein Windwaker Eco 7
Mitsubishi MSZ-DM35VA 8
Daikin Sensira FTXC35B
Haier Geos Plus
Klarstein Windwaker Eco
Mitsubishi MSZ-DM35VA
How could we do a wall air conditioner comparison without talking about Daikin? With a power of 3.5 kW in heating and 12,000 BTU in cooling the Daikin Sensira FTXC35B is a must.
Haier introduces its new Geos Plus wall air conditioner with R32 refrigerant. Thanks to the Intelligent Air function, it ensures a more uniform air distribution. Given the price, it will be perfect for small budgets.
The Klarstein Windwaker Eco series is best known for its self-cleaning function. The model presented here has an A+ energy efficiency rating despite its phenomenal cooling power (24,000 BTU).
The Mitsubishi MSZ-DM35VA is a reversible wall-mounted air conditioner with an A+ energy class. It uses an inverter compressor for its refrigerant gas, while offering a good quality/price ratio.
Cooling capacity
12,000 BTU
12,000 BTU
24,000 BTU
12 000 BTU
Energy efficiency class
A++ / A+ (heating)
A++ / A+ (heating)
A++ / A+ (heating)
A+ / A+ (heating)
Noise level
55 dB
56 dB
63 dB
52 dB
Optimal cooling coverage
35 m²
35 m²
70-117 sq. m.
40 m²
Type of refrigerant used
R32 gas
R32 gas
R290 gas
Gas R410A

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Buying guide - split wall air conditioner

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How to choose your split wall air conditioner

Finding the right wall split air conditioner doesn't have to be difficult. Whether you're looking for your first wall split air conditioner or you're looking to replace an existing wall unit, there are a number of factors you'll need to consider to find the right model for you.

#1 - The size of the part to be cooled

As with all air conditioners, purchasing a wall-mounted split model with the appropriate cooling capacity is the most important starting point. Wall split air conditioners use British thermal units (BTUs) to measure their cooling capacity. The higher the BTU number, the more square footage the air conditioner will be able to cool.

#2 - Energy efficiency

Wall-mounted split air conditioners are an energy-efficient way to cool your space, especially in small and medium-sized spaces without access to central air conditioners. Each wall-mounted model comes with an energy guide label that is a snapshot of its energy-related information. This energy label primarily indicates:

  • The cooling capacity expressed in kW
  • The energy efficiency rating (A++ to D)
  • Estimated energy consumption in kWh
  • The sound power level
  • SEER or seasonal efficiency ratio in cooling mode

#3 - Energy Star Certification

Wall split air conditioners that are at least 10% more efficient than comparable models can become Energy Star certified. If you buy an Energy Star certified wall split air conditioner, you can be sure you have purchased an energy efficient model. Many features and modes can help wall split air conditioners earn the Energy Star label, including an "Eco" mode or a programmable timer.

#4 - Additional modes

Wall split air conditioners with additional modes can keep your space comfortable all year long. The most common mode that users look for is the Heat mode. Many split wall air conditioners offer extra heat during the winter months and typically use electric heat or a heat pump for this. Other split wall air conditioner models have a dehumidification mode, a fan mode, and a standby mode.

#5 - Practical features

Split wall air conditioners include a variety of features to make their use as convenient as possible. Look for the following features first when purchasing a new wall split air conditioner: digital controls, adjustable fan direction, remote control, automatic restart, washable air filters and adjustable timer.

How does a split wall air conditioner work?


Before installing a new wall split air conditioner or replacing your existing system, it's important to understand how it works. The air conditioner in a central heating and cooling system provides cool air through the ducts inside your home, using a process that draws warm air inside, removing its heat.


A wall-mounted split air conditioner, on the other hand, consists of internal and external units. These two parts of the system are connected by piping and electrical wiring, which allows refrigerant, a cooling agent used in refrigeration products, to flow to and from each unit.

The operation

In a split wall air conditioner, the compressor condenses and circulates refrigerant through the outdoor unit, turning the gas into liquid. The liquid is then sent through the indoor evaporator coil or cooling compartment. The indoor unit fan circulates the indoor air to pass through the evaporator fins.

The metal fins of the evaporator exchange heat energy with the air around it. There, the refrigerant turns to vapor, removing all heat from the surrounding air. As heat is removed from the air, the air is cooled and returned to the house.

From this point, the condenser or outdoor unit then turns the refrigerant vapor into a liquid, removing any heat. By the time the fluid leaves the evaporator again, it is a cold gas at low pressure, eventually returning to the condenser to begin its journey again. This process continues over and over again until your home reaches the desired cooling temperature, as programmed and sensed by your thermostat setting.

Window air conditioner or wall split air conditioner?

Window air conditioner

Window air conditioners are often the saving grace of summer. As a fairly inexpensive and easy-to-install air conditioner, window units are perfect for do-it-yourselfers. All you need is an available window and a power source, and you're ready to go. Typically, window air conditioners have a BTU range of 5,000 to 36,000, which means they can cover an area of about 10 to 150 square meters.

Window air conditioners are one of the most affordable air conditioner options. In addition, they are easy to move. However, they can be very noisy and do not have a very nice aesthetic appeal.

Wall mounted split air conditioner

Split wall air conditioners work in the same way as window units, by collecting air, passing it through coils, and then sending the cooled air into the room. They are installed in a hole in an exterior wall, and require the installation of a sleeve due to their weight. These air conditioners have a BTU range of 7,000 to 15,000, with a coverage area of 20 to 75 square meters.

In addition to being efficient, split wall air conditioners will save you space in a room. On the other hand, the initial installation of a wall split air conditioner can be tedious.


When deciding on the type of air conditioner you want to buy, start by determining the type of room or space you want to cool. Measure the square footage and use an online BTU calculator to determine how much power you will need, which can be an easy way to narrow down your options. From there, you can see which one makes the most sense for you.

Generally speaking, if you're looking for a fast, powerful, and easy way to cool off without too much expense or installation hassle, a window air conditioner will be the perfect solution. But if you want a reliable, long-term solution and don't mind paying a little more for installation, a wall-mounted split air conditioner can be a great choice for many people, and probably for you.

5 reasons to buy a split wall air conditioner?

Can both heat and cool

Most split wall air conditioners have heat pumps. This means they can both heat and cool your home, eliminating the need for a separate heater.

Has better energy efficiency

Split wall air conditioners will not lose cooled air due to duct leakage. And duct leakage is a real problem with central air conditioners. Experts estimate that in a typical home "about 20 to 30 percent of the air flowing through the duct system is lost due to leaks, holes and poorly connected ducts."

Ensures greater comfort

When you have a split wall air conditioner installed in your home, you control exactly how many units are installed. This means you can strategically place the units to ensure comfort in the most important rooms of your home. This allows you to maintain a constant temperature and comfort.

Operates very quietly

Many packaged air conditioners are noisy, making it difficult for you to relax or work at home. They can even interrupt your sleeping patterns when they constantly turn off and on. The main parts of a wall-mounted split air conditioner are placed outside your home so you don't have to hear your cool air being produced.

To save money

One of the main benefits of a split wall air conditioner is the long-term money it will save you. Split wall air conditioners require less energy to operate, so you can keep your home cool without spending a lot of money on energy.

The best brands of wall-mounted split air conditioners

In our opinion, the best brands of wall-mounted split air conditioners in 2022 are :

Mitsubishi Electric
Olimpia Splendid
Suntec Wellness

Klarstein is a German household appliance and air treatment company that is only 15 years old. Its fans, air coolers and air conditioners are among the best value for money on the market. If you're looking for a good wall-mounted split air conditioner at a low price, choose Klarstein.

Daikin is a leading brand in wall-mounted air conditioning with 17 subsidiaries worldwide, 4 sales offices and a network of sales contacts in more than 50 countries in Europe, the Middle East and Africa. When it comes to wall-mounted split air conditioners, it is a safe bet.

After Daikin, Mitsubishi Electric is the best brand of wall-mounted air conditioners present in the UK. Its products are highly reputed and most professionals use them for their premises and industrial installations.

World leader in air conditioning, heating and air treatment, Olimpia Splendid focuses on the design and simplicity of its appliances. The most power in the least amount of space is its credo. If you want an efficient wall split air conditioner, you know which brand to choose.

Here is a brand that deserves to be known worldwide for the quality of its appliances. Suntec Wellness regularly places one of its units in air conditioner comparisons. The sturdiness of its Klimatronic range is certainly not foreign to this.

What is the price for a split wall air conditioner

The diagram below will help you to get an idea of the typical prices for each price range (entry-level, mid-range and high-end).

However, more expensive does not necessarily mean better.

We therefore advise you to always consult our ranking before deciding, rather than blindly relying on price ranges.

300 £ to 500 £
500 £ to 800 £
more than 800 £
Price range diagram


Limit the temperature difference between indoors and outdoors to -7°C

You will already have cool air by lowering the temperature in the room by 3 to 5°C compared to the outside. Beyond 5°C, energy consumption will skyrocket. Try never to reach a differential of 7°C from the outside, or you risk suffering from heat shock or catching a cold.

Call a professional for installation and maintenance

One of the main reasons for a split wall air conditioner failure is a poor installation job. The air conditioner's compressor may not start or the outdoor unit may not be included as a whole. Users often install split systems themselves without any special know-how, equipment or tools.

This makes the unit more likely to fail sooner, speeding up the need for repair or complete replacement. That's why we always recommend that you hire professionals when installing and periodically servicing your wall split air conditioner.

Clean the filters regularly

Regular cleaning of the filters in the wall split air conditioner greatly extends its life. The proper functioning of the unit and the cooling estimate also depend on it. In addition, clean filters ensure healthy air distribution, free of fine particles, and maintain satisfactory air quality in the home.

Keep the remote control out of reach of children

It's a fact, children love to press any remote control. To prevent them from breaking it, keep it out of their reach. This will also prevent accidental tampering that could mess up your electric bill or even damage the air conditioner.

Use the timer

When it comes to energy consumption and reducing your air conditioning bill during the summer, every degree counts. So one of the most energy-efficient things you can do is set your thermostat to a comfortable temperature that won't make your unit work too hard, but will still make you feel cool.


How to install a wall-mounted split air conditioner?

Unless you are very comfortable with air conditioners, always have a licensed professional install a wall split air conditioner. The way a wall split air conditioner is installed can vary depending on the manufacturer, but here's how it's usually done:

  • The first task is to attach the mounting plate to the interior wall of your choice.
  • Next, you will need to create a hole above the mounting plate to run the system piping.
  • The next step is to connect the pipes from the indoor unit to the outdoor unit.
  • The indoor unit will then be connected to the mounting plate ready for installation of the outdoor unit.
  • The outdoor unit can then be installed.

Will a split wall air conditioner completely replace my current central air conditioning system?

Although your new split wall air conditioner is intended to be used as your primary cooling system. You may choose to keep your current system in case you need backup cooling. During hot weather, when temperatures are extreme, some parts of your home may not be cooled enough. Your split wall air conditioner can be used to maximize cooling.

For what purposes would a wall-mounted split air conditioner be appropriate?

Split wall air conditioners are very versatile. They are a good choice for cooling a room if you don't want to close the window or if a particular room has no window. They are reasonably energy efficient and are available in different models. If you don't have an existing hole in the wall, the unit may require professional installation.

Are wall-mounted split air conditioners quiet?

Overall, split wall air conditioners are quiet comfort solutions. Designed to be installed in bedrooms, hotel rooms, dorm rooms and more, they are designed for situations where noise levels are important. Some wall-mounted split air conditioners average a noise level of 50 dB, which is about as loud as the refrigerator in your kitchen.


Note: Below are some of the sources we have consulted in writing this article. Links to other sites are not continuously updated. It is therefore possible that a link may not be found. Please use a search engine to find the desired information.
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March 2022 : Translation of this buying guide from our partner

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Our selection
Daikin Sensira FTXC35B 9
Daikin Sensira FTXC35B
Haier Geos Plus 10
Haier Geos Plus
Klarstein Windwaker Eco 11
Klarstein Windwaker Eco
Mitsubishi MSZ-DM35VA 12
Mitsubishi MSZ-DM35VA


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