Evaporative Air Coolers are an excellent alternative to aircons. Using less than 80% electricity than an aircon. They are eco friendly and promote healthier working environment as they purify the air through the water system and the air is constant air from outside, not recycled like an aircon. Doors and windows can remain open. Aolan is the leading brand in the world. Producing high quality, energy saving and environmental friendly products. I have been trained by Air Supply (SA) to do these installation and keeping with the high standards set out by Aolan.