Main purpose of this paper is to investigate the improvement in energy-saving performance by comparing before and after rebuilding or renovation of the public rental housings based on statistical approach. For this purpose, actual data and information related to annual energy consumption, environmental awareness and lifestyle are collected through the questionnaire to the tenants. Electric power, city gas and water consumptions are decreased more than 10% by introducing latent heat recovery type hot-water supply machine and water-saving toilet system and shower kit etc., although living comfortable level after rebuilding is improved by bathtub enlargement and three-place hot-water supply system. We also accepted the weak correlation between the environmental awareness level and energy consumption volume. We believe that this correlation strongly suggests the further energy-saving potential without additional facilities installation.
