This paper studies the Frequency Temperature Control mechanism and cold (heat) metering algorithm about central air-conditioning terminal installations. The temperature control and household metering management system for central air-conditioning terminal machine are developed. The system hardware, software design programs and key technologies are expatiated. The terminal machine is integrated with PIC microcontroller, user data acquisition, transmission and control. Delphi language is used in the accounting management system of the host computer. The results show that, the system is no need of new wire, the high performance-price ratio, easy assembly, stable operation and reasonable charge. It is of great significance to adopt the heat and cold metering for the energy conservation, environmental protection and property management. At the same time, it provides the property management with a new technology and channels for the modern intelligent building.
