Water Cooled Air Conditioning

Bespoke internal water cooled air conditioning system installations in London & Home Counties.

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Fully Internal Air Conditioning Solutions For Residential & Commercial Properties

Have you been told that you cannot install an air conditioner with an external unit due to property restrictions? Our internal air conditioning solutions are ideal for those who live or work in restricted buildings or have limited space. From versatile wall mounted units to discreet ducted systems, we have a solution to meet your requirements. 

Traditional AC systems usually require planning permissions due to the external condenser. Water cooled systems require no planning permission and are suitable for installation in apartments and Grade II listed buildings.

We have installed thousands of units across London & Home Counties. We offer high quality, bespoke installations at a competitive price. We offer a free consultation and site survey to help you assess what unit would work for your property.

wall mounted air conditioning in bedroom
water cooled internal condenser unit

Our water cooled air conditioning units


  • Reduced Water Consumption
  • Class A+++/A++
  • Gas R32
  • Maximum Silence
  • Full DC Inverter + H2O Inverter

Over 30 years of Air Conditioning expertise

Since starting in 2002, ACS Installations is the leading supplier of AC products and installations in London and Home Counties.

We offer a bespoke installation service to suit your needs and requirements. If you are looking for an internal AC solution, we should be your first choice. 

We have completed hundreds of installations all over London and the Home Counties.

Certified Experts
Bespoke Installations
air conditioning engineer smiling next to wall mounted air conditioner after installation

Our Features

Guaranteed Quality

We have accreditations from F-Gas and more so you are in safe hands.

No Outside Unit

We are the pioneers of water cooled air conditioning units in the country.

Energy Efficient Units

Our units are optimised to function at maximum efficiency.

Condenser Hidden

We tailor our installations based on your specific requirements.

Low Noise & WiFi Control

Whisper quiet operation and WiFi enabled air conditioning.

Dedicated Helpdesk

Our London based help desk engineers can assist you when you need us.

Where to install

Internal air conditioning offers great versatility and are ideal for both residential and commercial use. Internal water cooled air conditioners are an ideal solution for residential properties in London and surrounding counties with property restrictions or limited space.

wall mounted air conditioner in living room

Ideal for restricted properties such as apartments where an outdoor condenser unit is not allowed.

water cooled air conditioner in listed building

Listed Buildings

If you live in a Grade II listed building, an internal unit can be installed with no planning permission required.

wall mounted air conditioning in bedroom
Loft Conversions

Ideal for rooms throughout your home, including loft conversions with limited space or planning restrictions.

wall mounted cooled air conditioning unit on office wall

Effective solution for office spaces with planning restrictions to maintain an optimal climate.

wall mounted air conditioning in retail
Retail Spaces

If you own a small retail space with restrictions, water cooled units allow you to install air conditioning internally.

wall mounted unit in server room
Server Rooms

Ideal for server rooms, internal units enable you to keep your IT equipment protected all year around.

How it works

Water cooled systems are plumbed directly into your water supply. They use the cold water in a controlled manner to cool the air through the piping system. Unlike traditional air conditioning systems, water cooled units do not require an outdoor unit. The internal condenser is usually hidden within the property in a concealed space such as a cupboard or under the kitchen sink.

Mains Water Supply
Internal Condenser
internal wall mounted water cooled air conditioning how it works diagram

Frequently Asked Questions about our water cooled internal condenser units

Some of your questions about our water based air conditioning answered.

Yes, installing a water cooled air conditioning systems or through the wall air conditioning is the only option you have in a listed or restricted property. Contact us if you would like to discuss getting a water based AC in your home.

In most cases no, a water based AC unit has the internal condenser hidden in your own home so there is no need for permission.

A typical single split type AC unit will take 1-2 days to install. We can give you a good estimate if you contact us and inform us about your property and what you require.

Modern units are very quiet. In the workplace, you rarely notice them while in bedrooms at night time certain specific night set back settings slow the fans down to reduce the cooling requirement in line with falling ambient temperatures.

The electrical power consumption of an average size AC system will be little more than a domestic fridge. The cost of the water consumption element depends on how and what you pay for your water, and indeed the usage characteristics of the user. Water consumption rates vary on unit size and our specialists can advise you according to your requirements.

Air conditioning works by way of transferring heat from the air inside a room into the internal gas and then pumped along the pipework to an outdoor unit where the gas transfers the heat to the external air. The heat exchange process happens when the internal air is passed over a heat exchanger coil called an evaporator. Inside this evaporator is refrigerant that boils off at a very low temperature making the coil very cold. When the warm air passes over it then heat is absorbed from the air into the coil. The reverse happens with the heat exchanger in the outdoor unit.

In a water based air conditioners, water is used throughout the system. There are some water based air conditioning systems in the market, such as evaporative coolers, but they are not as efficient as a traditional air conditioning system.

A water cooled system, which we offer is a traditional AC system but with the addition of water use. The features we list above are not available through the other water based system.

Contact our specialist team

Get in touch with our team by phone, email or by filling in the form below.

0208 669 1112

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