In this paper we made energy consumption units of glass curtain wall type apartment and general apartment in Busan metropolitan city and compared energy consumption characteristics by building envelope. The monthly electricity consumption units of general apartment were shown in the range of $1.16{sim}1.51kWh/m^2{cdot}mon$ which were indicated higher value in January, February, August and September with little variation. On the other hand, in case of glass curtain wall type apartment, monthly electricity consumption units were represented in the range of $1.91{sim}7.07kWh/m^2{cdot}mon$ with significant fluctuations monthly, which were outstandingly high in July, August and September. The monthly city gas consumption units of general apartment were found to be in the range of $1.79{sim}18.07MJ/m^2{cdot}mon$, while glass curtain wall type apartment were within $0.94{sim}19.91MJ/m^2{cdot}mon$. City gas consumption units from December to March were shown highly in both type apartments. The monthly energy consumption units of general apartment were found to be within $14.23{sim}30.69MJ/m^2{cdot}mon$, while glass curtain wall type apartment were within $24.49{sim}68.9MJ/m^2{cdot}mon$. Energy consumption units of glass curtain wall type apartment were suggested 4.84 times higher than those of general apartment.