IENet stands for Intelligent Environment Service Network, an installed network of computers to efficiently control the air-conditioning system. Sensors and detectors will be equipped to monitor temperature, humidity, CO₂, motion and to gather and transfer information of air-conditioning devices and their environments through a Virtual Private Network (VPN) and towards IENet Platform. User can control and monitor system equipments through webpage on IENet Platform. By this method, user is capable of automatically operate air-conditioning system for effective energy management, which also helps reduce electricity costs and CO₂ emission.