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This paper presents an investigation of a direct evaporative air cooler (DEAC) under Algerian climate, at the city of BECHAR. We carried out the theory and design of the DEAC. Simulation is done for an evaporative air cooler for three successive months June, July and August under TRNSYS environment. Measured weather data of the selected site are generated by METEONORM software. Result showed that the maximum depression of the dry bulb temperature reached is about 18.86 degrees C and the Energy Efficiency Ratio (EER) is calculated. Evaporative cooling equipments work well in the hot and arid southern regions, which constitute practically the two third of the country. They have no impact whatsoever on the environment. Energy consumption is much less than in classical air conditioning units this is why these systems can be powered by solar photovoltaic panels. (C) 2010 Published by Elsevier Ltd.