Evaporative coolers make use of less power than refrigerant-based coolers as they work with the concept of blowing air via a great 'curtain' of water that then evaporates and introduces a cooling impact. http://www.vividedge.com/__media__/js/netsoltrademark.php?d=www.multichain.com%2Fqa%2Findex.php%3Fqa%3Duser%26qa_1%3Dcementjune68