The aim of this paper is to achieve the thermal comfort inside building with the mean of passive and hybrid evaporative cooling. The application was carried on Aswan in south Egypt in the biggest desert of the world, where the climate is very hot and dry. A building model was developed to calculate the effect of the evaporative cooling. A comparative study is carried on Islamic, traditional and modern architecture building arts. The calculations was done each hour, each day allover the year. The results were plotted for a representative summer day. The evaporative cooling has a great effect on the room cooling. The comfort conditions were gained in the ground and upper floor with direct evaporation of 15 l/d and 25 l/d consequently accompanied with summer night ventilation 5 h-1. The required amount of water could be gained with the mean of water areas like fountains, or moving water areas like Salsabil, water walls, water drop units with the help of air movement.