This project introduces “Air conditioning control system” to air conditioners in six component factories in Vietnam. The system constantly monitors operation status of the compressor equipped in the air conditioner outdoor unit by measuring an electric current at the optimum programmed timing. Controlling the compressor once or twice in thirty minutes and the system reduces energy consumption and CO2 emissions. This system can be introduced to existing facilities and realizes energy-saving by preventing excessive cooling without impairing comfortableness.