Natural down-draft evaporative coolers are devices recently developed at the University of Arizona's Environmental Research Laboratory (ERL)> These towares-like devices are equipped with wetted pads and sprays at the top which provide cool air by gravity flow. In arid regions, these devices can be used for cooling residential and commercial buildings, as well as outdoor private and public areas. This paper focuses on some recent developments and applications of the towars in arid regions internationally and nationally. The paper also demonstrates CoolT~( direct C ), a computer program developed by the author that has been used for cool tower sizing and performance prediction. Recent examples include the Botswana Technology Center, a Headquarters office building in Sourth Africa currently undr construction. This building is cooled by a series of cool towares, and the MOMRA'Environmental Rowdah" project in Riyadh, Aaudi Arabia another recently built project which demonstrates the use of cool otwars for cooling outdoor spaces.
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