The aim of the study is to obtain the design method for thermal environments inside semi-outdoor space, such as covered mall. First, thermal environments inside covered malls located in West Europe under cold climate in winter were investigated on field observations in winter 1996. Next, taking geographical difference into account, the climate control ratio was proposed and the semi-outdoor space was divided into two types of heating control and cooling control based on the meaning of climate control. Then, the climate control ratio was applied to evaluate the climate inside the semi-outdoor spaces at West Europe, Southwest Asia and Imabari City, Japan.
