The operational range of the evaporative cooler means, particularly one chilling air and/or water to 79 F. or less when the outside ambient air temperature rises to 120 F. at a relative humidity as high as 50%, is extended by pre-cooling the intake water with a thermoelectric heating/cooling element,...http://www.google.com/patents/US6418728?utm_source=gb-gplus-sharePatent US6418728 - Thermoelectric water pre-cooling for an evaporative cooler
