In our previous report, we evaluated the outside air load reduction effect of the natural energy ventilation system by roof thermal collection and earth tube of house located in the city of Fujisawa (Kanagawa Prefecture). In this report, we evaluated the outside air load reduction effect, surveyed the electric power consumption and predicted energy self-sufficiency rate of wooden house located in the city of Kasukabe (Saitama Prefecture). The results the outside air load of this system is about 36 % reduction compared to the case without system. In addition, the annual electric power consumption of the measured house was 6,796 kWh/year, and the energy self-sufficiency rate with the introduction of solar power generation and electricity storage system reached 81.1% at 5 kW of solar power generation. It was expected that energy independence would be possible by reducing the outside air load of this system, optimizing of control conditions for switching, or energy conservation behavior by residents.
