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The energy-savings of this sort of cooling are staggering (90% plus!) when compared with air-conditioning. If you think that air-con accounts for 15% of total US energy-use (261 billion kW annually - this incidentally also equates to the entire annual fossil fuel consumption of Africa), the possible money, energy and ecological savings offered by this sort of technology are remarkable.
Now, evaporative cooling does not reduce temperatures to as low a level as air-con. It will typically bring temperatures down to about 21°C, but this is a very respectable, comfortable level for a hot summers day. There are other significant advantages which we show in the table below.
| Evaporative Air Cooling | Refrigerated Air Conditioning |
| Uses 10% of the electricity required by conventional air conditioning | High electrical use due to refrigerant circuit compressor |
| No refrigerants | Uses environmentally damaging refrigerants |
| Supplies 100% fresh, outside air and cools it | Produces recycled internal air that is cool |
| Low Carbon Dioxide footprint | High Carbon Dioxide footprint |
| Simple engineering, easier and cheaper to maintain | Complex engineering, hard and expensive to maintain |
| Low purchase cost | High purchase cost |
| Performance improves at high temperatures | Performance reduces at high temperatures |
| Open windows and doors provide effective evacuation of air | Must not leave Windows & Doors open |
As a sufferer of air-borne allergies at work caused by air-con, I love that one about being able to leave windows and doors open!
This sort of cooling does raise relative humidity within the space being cooled, however at temperatures below 25°C (which is what you're getting) this does not produce any feeling of discomfort. Nor is there a risk of condensation occurring if you follow the design guidelines for ensuring balanced airflow and evacuation that need to be followed when installing this sort of unit.
The question of Legionella does not apply to these systems as they operate below 25°C, do not let water stand and do not emit water droplets. In 3 million installations worldwide, there has not been a known case of Legionnaires.
Evaporative Cooling really does present a compelling energy-saving case against air-con and while it won't compete in instances where really low working temperatures are required, for 90% of home or commercial applications, it sits right in the comfort zone.
The question of Legionella does not apply to these systems as they operate below 25°C, do not let water stand and do not emit water droplets. In 3 million installations worldwide, there has not been a known case of Legionnaires.
Evaporative Cooling really does present a compelling energy-saving case against air-con and while it won't compete in instances where really low working temperatures are required, for 90% of home or commercial applications, it sits right in the comfort zone.
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