Abstract
We investigated both lifestyle and energy consumption of 626 university students in Tohoku area by questionnaire surveys to assess energy conservation behaviours and energy consumption of one-person households. As a result, the following observations were obtained: 1) The percentage of possession of most appliances for one-person households, with few exceptions, was as high as the percentage for one-family households. 2) The difference in household type affected energy conservation behaviours and temperature in living room. 3) The annual energy consumption of one-person households varied in the characteristic of house occupant such as university students and workers.