Energy is an important source of power for human daily activity. Energy efficiency is measured by the productivity of the system which goes through under certain condition as to achieve results at optimum level. The basic purpose of this study is to reduce and save energy consumption in order to determine the energy efficiency of public university library. Thereby saving measures can be identified from the building services installed in the library. From the findings, there are two major system correlates which is mechanical and electrical system. Based on these systems, it could resolve intricacy issues regards to building efficiency by conducting an Energy Saving Measures (ESM) in context of Malaysia’s tropical setting. Lack of supervision and excessive wastage of energy will render inefficient in both systems which would decrease the optimum level of performance and reliability issues. The study emphasizes that energy conservation should be prioritized in order to avoid unregulated energy consumption. Hence, it could focus on the main streamline where energy efficiency is a possible and potential sustainable building in the present and future for better surroundings and standard quality of life.