The purpose of this study were to investigate the state of indoor environmental factors and energy consumption during winter in residential houses and to analyze factors which influenced this environment. Energy consumptions and indoor environmental factors of this survey were conducted in 21 houses(apartment; 11 and detached houses;10) between December, 2010 and February, 2011 which measured energy consumptions and indoor environmental factors as well as kept records of interviews with residents and other related factors. The results obtained were as follows. Indoor environmental factors which were found to influence apartment houses higher than detached houses. The average gas consumption of detached houses(90.98㎥) was higher than that of apartment houses(76.33㎥). Gas consumption showed positive correlations to temperature and carbon dioxide in the residential houses. The mean concentration of PM10, and CO2 in large family were higher than those of small family. We found that the more gas consumption, the higher concentration of PM10, CO2 and temperature(p<0.01). Keywords : Energy consumption, Indoor air quality, Carbon dioxide, PM10