Change in lifestyle is a key component to realizing a low-carbon society. A research group examined determinant factors associated with the residential consumption and perception of savings of electricity and gas based on data collected from a large-scale survey in Suita City, Osaka, Japan, in two different years: 2009 and 2013, and ‘household income,’ ‘actual amount of energy consumption,’ and ‘perception of energy savings’ were identified as three closely related elements.