In the present time, scrupulous use of energy is a challenge for the world population especially in Egypt. This period, Egypt is attesting creation new communities and our needs for energy will increasing, so we need a new way to design this communities and buildings with less energy. Use the passive techniques in buildings for cooling will be more harmonious with the nature and will achieve energy efficiency. This Paper will examine the Natural Ventilation Technique as one of passive cooling techniques for hot humid climate. It also will confirm that this passive cooling technique has attainable gains through analyzing its effect on Housing Building in port said climate using Design builder simulation program. The findings of this study will help to explore new approach of design energy efficient buildings for sustainable development in the present era and Egypt future using passive cooling techniques.