The study investigated the performance of a 5-ton capacity indirect evaporative cooler under controlled environmental conditions (43.9 C dry-bulb temperature and 19.9% relative humidity) but for different air flow rates (631 to 2388 m(3)/h). The experimental results showed that the intake air energy efficiency ratio of the cooler varied from 7.1 to 55.1 depending on test conditions and air flow rate. The power consumption of indirect evaporative cooler was found to vary from 68.3 to 746 watts. Water consumption was found to vary between 0.0160 and 0.0598 m(3)/h. At full fan speed, an average of 58.7% of the total water consumed by indirect evaporative cooler was evaporated. The results indicated that intake air energy efficiency ratio was directly proportional to the wet-bulb depression. The study also showed that the indirect evaporative cooler is suitable for hot and dry climatic conditions. (C) 2013 Elsevier B.V. All rights reserved.