Two-years investigation on energy consumption was carried out for 9 residential buildings in Tohoku district from Dec. 2002 to Nov. 2004. In order to make clear the effect of low-impact life style on energy consumption, the low-impact life style menu on energy consumption was indicated to the occupants in 7 residential buildings, and the actions following the menu was investigated. The action period was a week in spring, summer and winter, respectively, in the second year. This paper reports the measurement results of energy consumption for two years and analyzes the causes of difference of energy consumption between the two years. The main results are following: 1) The annual energy consumption decreased 6% in the second compared to that in the first year. 2) The average of energy saving effect was 6% during the action of low-impact life style of a week in spring and summer. However, in winter, the average of energy consumption increased 11% compared with that of the week before the action. One of the reasons is the colder weather. 3) After the action of low-impact life style of a week, the average of energy saving effect was 4% in spring and 7% in summer compared with that of the week before the action. On the contrary, the average of energy consumption increased 13% in winter. 4) The results indicated that the energy consumption decreased in the second year because the energy saving consciousness became stronger after low-impact life style was acted.
