Table 1.

General information of country and study site.

Information		Description
Population (Nationwide)		51.78 million (2019) [21]
Population (Seoul metropolitan area)		25.89 million (2019) [21]
Climate of the country		'Dwa' in Köppen-Geiger classification
Our study site information	Location	Gyeonggi province, Republic of Korea (Located in Seoul metropolitan area) Latitude: 37.378, Longitude: 127.118
	Housing type	Apartment complex (16 buildings)
	Number of households	918
	Floor areas	103–228 m2
	Heat supply method	District heating Four pipe system having central substation Separate central SH and DHW heat exchanger
	Sub-metering method	SH and DHW submeters in each household