In this paper, the effects of energy system types and energy-conscious behavior on energy consumption in detached houses were studied. A questionnaire for the residents of detached houses in Kinki region was carried out. The energy system types of residential houses are next four types : 1) E-G house; the ordinary energy system, electricity and gas are supplied by the energy companies, 2) E-G-P house; the ordinary energy system, with a photovoltaic s system, 3) E house; all-electric houses, 4) E-P house; all-electric houses, with a photovoltaics system. As a result, the largest energy consumption in the primary energy conversion was found in all-electric houses (E house). On the whole, the energy consumption in E-G-P house was smaller than in E house.
