Internal Water Cooled Condenser Air Conditioning For Apartments In London


The prices shown below are lead-in prices (PER ROOM) for the complete supply and installation of one of our systems. Please contact us with the approximate dimensions, type and use of the room(s) to be air conditioned and we will be happy to give you an accurate price.
Depending on your budget and the layout of your apartment, sometimes by air conditioning just one room, it is enough to neutralise the heat build up within the whole apartment. We are happy to advise you of the best and most cost effective solution for you.

3.5kw (12,000 BTU/h)
DC Inverter Water Cooled (Internal Condenser)
Air Conditioning System

Supplied and installed
£4,650 + VAT per room
No hidden extra costs

(£5,580 inc. of VAT)


5.3kw (18,000 BTU/h)
DC Inverter Water Cooled (Internal Condenser)
Air Conditioning System

Supplied and installed
£5,250 + VAT per room
No hidden extra costs
(£6,300 inc. of VAT)


7kw (24,000 BTU/h)
DC InverterWater Cooled (Internal Condenser)
Air Conditioning System

Supplied and installed
£5,650 + VAT per room
No hidden extra costs
(£6,780 inc. of VAT)


Utilising the very latest energy-efficient DC inverter technology, our water-cooled internal condenser air conditioning systems allow you to reach your desired room temperature and keep it constant when the external temperature changes.


Providing a high level of comfort, low noise and cost effective installation, our water cooled internal air conditioning systems provide many benefits whilst cooling your property. These include:

  • Installation in just one day by our specialist FGAS refrigeration engineers
  • The ability to air condition multiple rooms – using just one internal condenser we can either cool one room or indeed cool multiple rooms, depending on the cooling needs of you and your property
  • No outside unit – providing the solution to stringent property restrictions and apartments with limited exterior space, everything is contained internally with our solutions
  • Energy-efficient DC inverter technology provides you with a significant reduction in energy consumption when compared to non-inverters and comparable to the very latest conventional AC systems where you are able to have an external condenser.
  • Compact design – The smallest and most energy-efficient condensers, designed and built by us, without compromise, for London apartments
  • Very quiet operation
  • Ducted room units available
  • Provides cooling simply by being plumbed into your property’s cold water supply, just like a dishwasher or washing machine
  • No pipe work on show
  • Extensive maintenance programme available with full parts back-up
  • A bulletproof 5-year parts and labour warranty


Our internal condenser water cooled air conditioning solutions have been specially designed and developed for apartments & listed buildings in London where you cannot have an outside condenser.

  • Everything is enclosed in your property
  • No outside access required
  • Ideal for retro fitting in apartments and listed buildings
  • Easily concealed condensing unit
  • ‘A++’ rated for Energy Efficiency
  • Energy efficient DC inverter technology
  • The latest environmentally friendly R32 refrigerant
  • We can air condition up to three rooms from one compact multi-split internal condenser
  • Different room unit options
  • Great for home-workers
  • Dehumidifies rooms in cooling mode
  • i-FEEL closer-to-you temperature control as standard on all DC inverter systems
  • No outside condenser

You Can have a beautifully cool apartment in one day!

In Central London, you will not be able to drill holes in exterior walls or install an external condenser. Cool You UK is here to help you!

We are the London experts for internal water-cooled air conditioning (Cool You are the true specialists since 2006, it's all we do.) We have installed hundreds of our internal systems all around the city. Our fully trained F-Gas certified engineers know the best way to install a water-cooled air conditioner in your home.

Find out more below, or contact Cool You today for a free site survey, to make an enquiry or request a callback.

What actually is a water-cooled internal condenser air conditioning system?

With most London apartment buildings, you are not permitted to use external condensers or make penetrations through the exterior walls of the building. Our internal water-cooled air conditioning systems are a no-compromise solution for fully-fledged air conditioning where you cannot have an external condenser box.

It's All On The Inside!

Our fully  internal solution includes a whisper-quiet room unit (fan coil). This is installed in the room that's going to be air-conditioned. We typically specify a wall-mounted unit for a retrofit installation. It can also be a concealed ducted unit, which is usually used during complete home refurbishments. The room units are very sleek and neutral, so it will not clash with your colour scheme.

No Visible Pipework - No Ugly Box On The Outside

The refrigeration pipework runs from the room unit typically into the ceiling void, so it is concealed, to the condenser box. In a conventional system, this is the ugly box on the outside. With our system, the condenser is on the inside, out of sight in your apartment. In most cases, we use the utility space or under a kitchen counter, where it is hidden from view, but close to the required services. The location will be discussed with you during a site survey.

Unlike a conventional system, our internal condensers use water to dissipate the heat in a controlled and efficient manner - this has allowed us to design a condenser that is a fraction of the size of an external air-cooled box. Our internal condensers are compact and incredibly quiet - you won't even know they are running.

A Whisper Quiet, Efficient And Practical Solution

Apart from the obvious benefits of our fully internal air conditioning systems, maintenance is straightforward. You won't have to worry about somebody going to the outside of your property in bad weather, or getting permissions to get on a roof. Also, there will be absolutely no disruption to your neighbours. There will be nothing on the outside for them to complain about, either visually, or from noise. Your outside space is valuable and compact, so you don't have to worry about having a large box taking up space.

With our system, the condenser is kept at a constant internal temperature as opposed to an external box. The efficiency (and running costs) of an external condenser can be compromised by external temperatures. In sweltering weather, the sun can be beating down on an external condenser preventing the efficient dissipation of heat. This does not happen with our internal condensers - they just tick along quietly and efficiently.

No Compromise - Just Great Air Conditioning

Our systems are not a compromise in any way over a conventional system. A Cool You fully internal water-cooled air conditioning system will cool and dehumidify with efficiency and will filter the air in your apartment, leaving you with a cool, comfortable home.

A whisper-quiet room unit in an open-plan kitchen/living/dining area within a modern London apartment.
A ducted room-unit, installed in a London apartment during a refurbishment of the grade II listed apartment building.

We’re Rated Excellent on TrustPilot

From the first consultation visit, the communication in the build up to installation, and the installation itself the whole team were fantastic. Great neat job of the install, couldn't be happier!
18. March, 2021.
The service provided was great from the very first inspection to the actual installation. They were clear on what to expect in terms of costs and timings. On the installation date, the installers showed up on time and were extremely careful and tidy when working. They basically left the place cleaner than before! Will definitely recommend.
Carolina & James
18. March, 2021.
I love this aircon. Worth the investment. The maintenance happens once a year and the engineers are so kind, informative.
Michelle Wareham
16. March, 2021.
Great service, very quick to install.
Mr T
10. March, 2021.
Great product for internal cooling! We are construction company offering Cool You to our clients looking for internal aircon solution. Cool You UK are very professional company with excellent working manor! We at ( can highly recommend them to everyone looking for internal cooling system! Their system is excellent and one of its kind! Thank you Cool You, it is always pleasure working with you!
15. February, 2021.
Cool You Uk is an excellent company for providing superb air conditioning solutions for apartment living. I had installed three units a couple of years ago and all have been a great success with low maintenance. The installation team were fantastic and all the work was done within a day and a half. My only reason for not awarding the company 5 stars is because the cost to supply and fit was quite expensive. That said I don’t regret the decision to have the air conditioning and I would highly recommend this company.
H Hiatt
12. February, 2021.
Excellent service ,completely professional from advice to completion. I would recommend them highly.
12. February, 2021.
Professional and efficient every step of the way. Very pleased with the installation and cannot believe I was actually able to get built in AC units in London without the need of a full construction job. The team came in and finished the job in half a day and cleaned up afterwards.
Hadeel Ayoub
12. February, 2021.
Excellent sales, installation and after-service experience - everyone I have spoken to has been super helpful and nice (starting with Savva). Very pleased with the end product too which is a life-saver in the summer times (hot, south-facing flat in London).
Max Jones
23. January, 2021.
Second annual service and all very straightforward and easy. It has been very reassuring as buying a hybrid system that requires no external driver can feel like a leap of faith sometimes as it is a bespoke/niche product. Couldn’t be happier with our outcome and our two annual services have gone very smoothly with excellent customer service both in the back office as well as on site customer service. Without it during the summer of 2020 and a lockdown we would have melted.
Chris C
20. January, 2021.


Call us on  0207 043 2275 or REQUEST A CALL BACK MAKE AN ENQUIRY