This study focused on the energy management on the operations of small air-conditioning at university. The uses of small air-conditioning equipment have been the issue of energy-savings because each university campus has installed the small window-type system almost for all classrooms, offices and laboratories. Due to the characteristics of load scattered and un-unified monitoring of the system, it results in ineffective energy-consuming and management. By using the actual case study, we find that the energy consumption can be decreased through the unloading control procedures. Our empirical results suggest that the investment in energy controlling and management system is a cost-effective means of addressing the energy-savings. The government should promote the policy on university campus nationally.