Say Goodbye to Overheating — Discover the Ductless Air Conditioning Solution London Has Been Waiting For
Is your London home unbearable in the summer? You're not alone. Across the capital, thousands of homeowners and residents suffer each year with overheating apartments, poor air circulation, and rising indoor temperatures caused by solar gain, over-insulation, and limited ventilation. Traditional air conditioning systems just don’t fit the bill — especially in apartments, period properties, and listed buildings where external condensers and bulky ductwork are simply not an option.
At Cool You, we’ve been solving this exact problem for over twelve years with our exclusive ductless air conditioning systems — designed specifically for London living.
What Is Ductless Air Conditioning?
Ductless air conditioning — also known as mini-split air conditioning — delivers powerful, efficient cooling without the need for traditional ductwork. The system typically includes an indoor unit that provides cooling directly into the room, and an unsightly external condenser that manages heat removal.
But here’s where Cool You is different…
Our systems are completely internal. That’s right — no external condensers, no planning permission issues, and no disruption to your building’s facade. We use exclusive, water-cooled condenser technology that is installed entirely inside your property — a discreet and elegant solution that maintains your property’s integrity while transforming your comfort.
Providing a high level of comfort, whisper quite - low noise, and cost-effective installation, our water-cooled internal air conditioning systems offer many benefits while cooling your property.
- Installation from just one day by our specialist FGAS refrigeration engineers.
- Our air conditioning system offers a cost-effective solution. We can cool multiple rooms with just one internal condenser, tailoring the service to your property's cooling needs. So, it may not cost as much as you think - speak to an expert today!
- No outside unit—our water–cooled air conditioning solutions provide the solution to stringent property restrictions and apartments with limited exterior space. Everything is contained internally.
- Energy-efficient DC inverter technology significantly reduces energy consumption compared to non-inverters and is comparable to the latest conventional AC systems, which can have an external condenser.
- Compact design – The smallest and most energy-efficient condensers, designed and built by us, without compromise, for London apartments with whisper-quiet operation
- It 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 complete parts backup
- A bulletproof 6-year parts and labour warranty
Why Choose Cool You’s Ductless Air Conditioning?
Our fully internal water-cooled air conditioning solutions have been specially designed and developed for apartments and listed buildings in London where you cannot have an outside condenser.
- Designed Exclusively for London Homes
Our ductless air conditioning is designed explicitly for London apartments, flats, and listed buildings, where space is limited and external alterations are often restricted. Whether you live in a modern high-rise or a heritage property (listed building), our systems are built to fit your environment and your lifestyle. - No External Condenser. No Compromise.
Unlike traditional mini-split systems, Cool You’s ductless systems are fully internal, using water-cooling technology to remove heat. This means:- No unsightly boxes outside your windows
- No planning issues
- No noisy fans outside your neighbour’s bedroom window
- Solving Real Problems, Every Day
London homes trap heat. Modern insulation, solar gain from large windows, and the lack of ventilation in city living can turn your flat into a greenhouse. On top of that, poor air quality and street noise mean opening the windows isn’t even an option.
Cool You’s ductless air conditioning systems solve all of this — quietly and efficiently:
- Beat overheating with powerful, direct cooling
- Filter your air for a cleaner, fresher environment
- Enjoy whisper-quiet operation with no intrusive background hum
Unmatched Expertise & Personal Service
For over twelve years, we’ve specialised in one thing: air conditioning for London apartments. Our team knows every quirk of building restrictions, leasehold issues, and space limitations. We handle everything — from survey to installation — with precision, discretion, and care.
Our clients consistently say our service is second to none — and it’s not just talk. From your first enquiry to post-installation support, we make the entire experience seamless, personal, and surprisingly fast.
Make An Enquiry or Schedule A Site Survey
To find out more, watch the video below about our water cooled air conditioning systems
What is an Internal Water Cooled
Air Conditioning System and How Does it Work?
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.
Water-cooled ductless air conditioning systems operate like traditional split-type systems with an external unit. However, our system uniquely uses water to cool the heated gas refrigerant instead of relying on outside air.
The key advantage of this design for you as a London homeowner is that it functions entirely indoors. It eliminates the need for an outdoor condenser. It only requires a water supply and a drain to connect to the indoor condenser.
How a Cool You state-of-the-art fully internal ductless water-cooled condenser works
The condenser's function in a water-cooled air conditioning system is primarily to cool the refrigerant and remove heat from the space. Connections to this condenser are similar to those required to plumb a residential washing machine or dishwasher. It has water-in and water-out connections. When needed, the motorised 3000-stage water valve opens up, allows controlled water flow through the condenser only, and shuts off automatically when not required. The condenser is set up to use the minimum amount of water to take the maximum amount of heat away.
The water being supplied can come from a condenser water loop system (if available), as typically found in multi-unit retail complexes or other clean water supplies, as long as the correct flow and pressure are available. Alternatively, as is the case in many apartments, it must come directly from the property’s main cold water supply. The water feeding the system goes through a check valve to prevent backflow, and the water being discharged from the condenser (typically 20-30 degrees warmer than the water going in) has the appropriate air gap and trap. This ensures that the system and the installation are compliant with regulations.
It's all on the inside...
Our entirely internal solution includes a whisper-quiet room unit (fan coil). This is installed in the room that will be air-conditioned. We typically specify a wall-mounted unit for a retrofit installation. Still, it can also be a concealed ducted unit, usually specified during complete home refurbishments. The room units are sleek and neutral, so they will not clash with your colour scheme.
Easily concealed water cooler condenser
The internal condenser is easily conscealed in a hall cupboard or even in a kitchen cupboard
The internal condenser is easily conscealed in a hall cupboard or even in a kitchen cupboard
A whisper-quiet room unit
Cooling the open plan kitchen/living/dining area
Cooling the open plan kitchen/living/dining area
Two water-cooled condensers
These were installed within a built-in wardrobe in a bathroom
Effortless cooling
With a whisper-quiet room unit in a kitchen
Space-saving installation
Internal condenser built into the ceiling void to save space in this apartment
Ideal For Bedrooms
Whisper quiet room unit options including high wall and ducted systems
No visible pipework and no ugly condenser outside...
Our system's installation is designed for your convenience. The refrigeration pipework typically runs from the room unit into the ceiling void (just like our wall mounted room units), which is concealed to the condenser box. Our innovative approach places the condenser on the inside, hidden from view in your London apartment, unlike traditional systems with unsightly external condensers.
In most cases, we strategically position the unit in the utility space or under a kitchen counter, ensuring it remains conveniently hidden yet near the required services. The exact location will be discussed during your site survey, providing a tailored approach that perfectly meets your needs.
Unlike conventional systems, our internal condensers utilise water to dissipate heat in a controlled and highly efficient manner. This pioneering design has allowed us to manufacture a condenser that is a fraction of the size of an external air-cooled box. Our internal condensers are compact, remarkably quiet, and incredibly efficient, a testament to our unwavering commitment to delivering the best product to you, our customer.
Make An Enquiry or Schedule A Site Survey
How long does it take to install a
Cool You Ductless Internal Water Cooled Air Conditioning System?
At Cool You, we pride ourselves on providing a seamless user experience. We prioritise your convenience and aim to simplify the entire process at every stage, from the survey to the installation. We will work around your schedule and ensure we arrive on time, keeping you informed throughout the process.
Our standard wall-mounted installations are designed to be completed in just one day, minimising any disruption to your daily routine.
Hidden ducted systems do take longer. These systems are usually installed as part of a building refurbishment. Our team will work with your architects and contracts throughout the process. This usually requires several visits for a first and second fix, followed by the final commissioning.
There will be no need for a follow-up appointment, as our team will provide all the necessary information to keep the system running smoothly. The installation process is non-invasive, ensuring that your room remains as spotless as it was before our team entered.
We encourage you to watch our latest videos if you have any doubts. In these videos, our managing director, Savva, answers the question: How long do your entirely internal air conditioning systems take to install? He provides a detailed explanation of the installation process and the factors that can affect the installation time.
How Long Do Things Take?
How much disruption and mess with there be?
We're really proud of our service and systems. Don't take our word for it. Have a look at some of our recent reviews.
To enquire about air conditioning in your London home, please contact the team at Cool You at (0207) 043 2275 or fill in the form below and we will get straight back to you.