Free Coolers | Free Cooling System

Transtherm Free Coolers are designed to reduce energy consumption and improve the carbon footprint of chilled water systems. When ambient air temperatures are low enough, through the majority of the autumn, winter and spring, the free cooler automatically dissipates the system heat allowing the more energy consuming chiller to switch off. 

  • Complete with integral controls, 3 way valve and actuator and bypass pipe work
  • Can be easily installed on existing systems as well as new builds
Transtherm’s adiabatic system provides “very effective management of Legionella risk”
The British Health and Safety Executive

Top Features


Reduce Energy Consumption

Reduce by as much as 80%


Short Payback Period

Full payback in as little as 6 months


Reduce Chiller Maintenance Costs

By offloading the chiller, it also extends the chiller lifespan


Maximise Benefits

Enhanced Capital Allowance Schemes


Fully Packaged

Only requires single 3ph connection


Bespoke Designs

Available to cater for unique requirements

Who are using Transtherm's Free Coolers | Free Cooling System?


RBS Data Centre – Edinburgh

3 x Transtherm Air Blast Coolers were supplied to cool the condenser water circuit of CRAC (Computer Room Air Conditioning Units) in summer months and offer free cooling in winter months.


Automotive Sector – Larkhall, Lanarkshire

Transtherm worked with a key reseller to supply a 300kW Air Blast Cooler for tool head cooling and a 400kW Packaged Free Cooler to offload chillers for over 60% of the year.


Red Bull Racing F1 Team Data Centre – Milton Keynes

3 x Transtherm Hydrodynamic coolers, combining Air Blast Cooler and Pump Set technologies, were used to cool CRAC units in summer and for Free Cooling in the cooler months.

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What Transtherm's customers say...


Transtherm’s adiabatic technology is an efficient, reliable and high-quality solution for directly cooling data centres in which the server temperature parameters allow for the eradication of compressor or refrigerant based technologies.

Their designs are based on real time weather data for the installation site and their knowledgeable team of mechanical engineers can quantify any specification decision with independent research and testing results for complete peace of mind.

Mark Mickleburgh
Senior Project Manager, Briggs and Forrester

Completing a build of such scale and complexity within just 16 weeks requires suppliers to adjust the design and build of their products in accordance to the build schedule and deliver them just in time for installation to prevent costly delays to NGD and our local contracting firms. The solution provided by Stulz and Transtherm is a great example of how data centres can work with trusted, reliable and dedicated supply chain partners..

Senior Project Manager, Briggs and Forrester

We were ultimately thrilled with the decision to upgrade to a new ambient-only cooling system, rather than simply switch the old chillers for a like-for-like replacement; something which we didn’t think was achievable within our original budget.

Commissioned during one of the hottest UK summers on record, the new system has already demonstrated its performance credentials and we are delighted with the results.

Paul Nile
Maintenance Manager, University of Plymouth

With a dramatic increase in digestion capacity and therefore gas production, the CHP system was working harder than ever before. With the CHP plant working harder, the original coolers were running at higher fan speeds for prolonged periods in order to manage the increased heat dissipation requirement.

It was clear the current cooler specification simply wasn’t able to maintain the engine and intercooler temperatures required for optimum engine performance. This was the point we turned to Transtherm.

EM&I Manager North, Wessex Water
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Transtherm - A Customer-centric business since 1989


    Transtherm’s adiabatic coolers are a low maintenance, modern alternative to traditional cooling towers and offer lower Legionella risk and OPEX


    Developed with energy efficiency and reliability in mind, our wide range of air blast coolers use the latest heat exchange coil, fan and control technologies


    Our cooling solutions for data centre have been recognised by the DCS Awards panel and we are proud winners of the 'Data Centre Cooling Innovation of the Year' Award.


    High water temperatures, low noise requirements and footprint considerations – Transtherm’s air blast coolers are designed to take all of these common factors into account


    Combining both technologies from Transtherm, the Packaged Cooler & Pump Set Solution requires minimal system design, installation and commissioning time


    Available for commercial and industrial applications, Transtherm’s standardised pump packages are a straightforward and cost effective ‘fit and forget’ solution


    Available for commercial and industrial applications, Transtherm’s standardised pump packages are a straightforward and cost effective ‘fit and forget’ solution


    Suitable for all standard refrigerant and steam-based condensing applications, Transtherm’s unit designs can be modified to ensure Pressure Equipment Directive (PED) compliance


    Transtherm’s market-leading control systems complement the full range of dry coolers, adiabatic coolers, free coolers, air cooled condensers and pump sets

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