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The high thermal insulation of housing construction has been spreading all over Japan, for the improvement of indoor environment and the efficiency of energy consumption. From the view point of global warming, it is acknowledged that the high thermal insulation reduces CO2 emission in the heating and cooling phase, but it increases CO2 emission at construction phase since the amount of materials for thermal insulation increases. In this study, the effect of the high thermal insulation, simulated on the condition of both phases, is taken into consideration. In the meantime, CO2 is emitted through many activities in daily life. In order to have more effective countermeasures against CO2 emission, it is important to grasp the amount of CO2 emission at the phase of daily activities as well as construction, improvement and disposal. The portion of each amount is also simulated in this study.