ECO2 is a program that certify building energy efficiency rating in Korea and thus it is important to have reliability on the accuracy of the program. The gap between calculated and measured energy consumption is defined as energy performance gap, EPG...
ECO2 is a program that certify building energy efficiency rating in Korea and thus it is important to have reliability on the accuracy of the program. The gap between calculated and measured energy consumption is defined as energy performance gap, EPG. This study aimed to compare the calculated and measured heating energy consumption using ECO2 program. The result showed that for all investigated buildings, measured data were larger than calculated data. Additional issues on reasons of EPG were analyzed, noting the importance of input data.