A Super-insulated house was constructed near Sendai City in accordance with the Canadian R-2000 manyual. Shelter performance, thermal environment, air quality and energy consumption of this house were investigated for two and a half years. This super-insulated house was very airtight compared with the other houses. The two-and-a-half-year measurement of room temperature and humidity showed that the daily mean temperature for the dining-living room and the master bedroom were 16℃〜20℃ during the winter and 22℃〜32℃ during the summer. Humidity ratio for these rooms was less than 5g/kg during the winter. The indoor environment of this super-insulated house during the heating season was more thermally comfortable, compared with that of ordinary houses in Japan. During the summer, the indoor temperature in this house was stable during the day and did not decrease at night time even if the outdoor air temperature dropped. The CO_2 concentration in this house was lower than that of the other airtight houses due to continuous mechanical ventilation. The space hiating energy consumption for this suoer-insulated house was less than that of ordinary houses in Tohoku District in which only the living-dining room was heated.
