Indirect Evaporative Air Cooling

Indirect evaporative cooling technology uses an efficient heat exchanger to produce 100% fresh, cool air with no added moisture. This cool air can be similar to that produced by refrigerated systems, with temperatures that that approach the dew-point temperature, using up to 80% less energy

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What is Indirect
Evaporative Air Cooling


Hot air is drawn into the cooler via the inlet by a powerful, energy-efficient electric fan. The hot air flows through the core, which is an air-to-air heat exchanger composed of alternating wet and dry channels.

All of the air passes through the dry channels and remains dry, without gaining any extra moisture.


Moist air is expelled outside. When the air exits the dry channels, a fraction of the conditioned air is directed back through the wet channels.

Through a combination of evaporation and conduction, it absorbs both heat and moisture. The channels are continuously soaked with water. This warm, moist air is then expelled outside of the building.


No moisture is transferred across the membranes that separate the dry and wet channels; only heat is transferred.

The heat moves out of the air in the dry channels through the membrane and into the air passing through the wet channels. In this way, the air flowing through the dry channels becomes progressively colder, without gaining any moisture.


Cool, fresh outside air enters the building. The air flowing through the dry channels in the core is chilled, without any addition of moisture. This cool, fresh air then enters the building.

Seeley International’s indirect evaporative coolers come equipped with air-to-air heat exchangers that use counterflow (Climate Wizard) technology.

Advantages of Indirect Evaporative Air Cooling
  • Uses up to 80% less energy
  • 100% fresh outside air
  • Efficiency improves as the outside ambient temperature increases
  • No moisture added to the air stream
  • Temperatures that rival those of traditional DX systems

Our Product Range

At Cooling Solutions, we offer a range of products designed to maximise energy efficiency and provide superior cooling solutions. With advanced features such as low noise operation and energy-efficient design, our products are designed to help you stay comfortable in any climate.

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