ZEROME H measures real-time power usage for three or more types of usage (cooling, ventilation, lighting) for zero-energy certification, displaying power and harmonics on an LCD screen. Collected data can be integrated with existing home network equipment installed within the household. Power consumption data (for three or more types of usage) collected from each floor is transmitted to the zero-energy system or remote metering system installed in the management office or central monitoring room, enabling communication linkage.