The increased demand for artificial cooling through the use of air conditioning units in order to provide comfort would also mean increased energy usage and increased electricity cost to the occupants in a hot and humid climate like that of Malaysia [14]. Cooling by natural ventilation and passive cooling is a good energy conserving design strategy to improve the indoor thermal comfort and air quality in a tropical country like Malaysia, which has high daytime temperatures of 29–34 1C and relative humidity of 70–90% throughout the year.