Considering the relationship between the environmental load and the environmental quality is very important in design of the ecological housing. Moreover, the importance of study from the viewpoint of lifecycle is increasing. Then, this study focuses on the relations between LCCO2 and daylight environment by sun control louvers at the window of living room model. In this case study, effective factors to decrease LCCO2 differ mainly depending on the materials of slats. In addition some materials indicates the relation of “trade off” between decreasing CO2 emission and keeping suitable daylight illuminance.
