To identify characteristics of passive cooling techniques quantitatively, a series of outdoor experiments using twin experimental test houses were carried out. As five passive cooling techniques applicable to actual outdoor rest facilities, foliage plant wall, water falling wall, roof water spraying, solar chimney and cool tower were picked up. Evaluating the effectiveness using SET^* as a parameter, it was verified that effects of roof water spraying, water falling wall and foliage plant wall were more significant than solar chimney and cool tower. Psychological influence of the water on passive cooling effect was derived from the results of subjective experiment.
