Free Cooling

Split-Air-3 with Direct Free Cooling

Up to 83 % savings on running costs thanks to Mixed and Free Cooling modes

Free Cooling mode

In many base stations, comfort air conditioning units without Free Cooling mode are still used today for air conditioning, with high energy consumption as the result. STULZ Split-Air-3 units exploit the potential of Free Cooling and slash running costs.


Mixed mode

Split-Air-3 units feature Mixed mode. If the outside temperature exceeds a given threshold, Free Cooling alone is no longer sufficient. Then, in Mixed mode, the runtimes of the compressor are kept to a minimum by the simultaneous use of Free Cooling and compressor cooling. In this way, depending on the local temperature profile, annual energy costs can be cut by a further 10 %. Further potential savings are achieved by the air conditioning unit working in partial load mode.

Air conduction in Free Cooling mode

Air conduction in Mixed mode

Air conduction in Compressor mode

The office in Amstelveen is open from 08:00 to 16:30 on weekdays.

  • Contact details

    Headquarters Amstelveen


    Postal Adress:
    Postbus 75
    Visiting Adress:
    Weverij 7-9
    Contact information:
    Tel.: +31 (0)20 545 11 11
    Fax: +31 (0)20 645 87 64
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