In Japan, it pays attention to a traditional lifestyle that harmonized with nature. A residence using natural energy is one of the effective measures against the global warming issues. Therefore, the proposal of a sustainable design of house and the lifestyle becomes more important to reduce the negative environmental impact. Measurements were conducted in an environmentally symbiotic house with double-deck engawa, the sustainable design laboratory that had adopted a passive technique. In this paper, measurement of natural ventilation effect in summer.
