According to Givoni (1994) there is a difference between bioclimatic architecture and passive cooling. Bioclimatic design consists of appropriate architectural design to keep the building from overheating or overcooling and can minimize the difference between the indoor average temperature and the outdoor average temperature but cannot lower the indoor average temperature below the outdoor average values. Chapter 6 discussed strategies for reducing overheating and overcooling in buildings. This chapter deals with passive cooling techniques, which are the only way in a hot climate to achieve average temperatures inside a building lower than outdoors unless mechanical or active techniques are used. In a cold climate we would need active or passive heating techniques.