Recent research shows great interest in increasing energy efficiency of a refrigeration system and finding appropriate configurations to optimize its performance. One main component in the refrigeration system is compressor. therefore, the compressor plays an important role in a refrigeration system for energy performance optimization. The study is aimed to experimentally investigate temperature and energy performance of a scroll compressor applied for medium temperature refrigeration systems. Tests were conducted in a water cooled medium temperature refrigeration system. Temperature performance evaluation of the compressor referred to the IEEE Standard 112, while energy efficiency of the compressor was calculated from the energy performance of the refrigeration system. The results clearly show that condensing temperature and evaporating temperature together with degree of superheat at suction gas line can significantly affect temperature performance of a scroll compressor. The results have also shown significant improvement on the overall compressor efficiency accounted for 14% when the evaporating temperature increases from -8.3 °C to -2.4 °C.