This work intends to create creative technical solutions for cooling turbine oil in order to reduce electrical energy consumption and improve dependability under several load and climatic situations. Particularly with major enhancements and adjustments to compressors, recent energy-saving needs have resulted in changes in cooling system components and operations. Although most of the time they run under partial load settings with on-off compressor cycles controlled by a thermostat, compression systems are normally built to run under maximum load conditions. Unlike conventional thermal control, variable-speed compressors continually control the speed to match the compressor capacity to the needed load, therefore enabling energy savings. Moreover, matching compressor capacity at any frequency with the whole cooling system capacity depends much on managing the heat transfer area in the evaporator. The cooling system thus becomes not only the compressor but also completely variable-capacity. This study intends to find the ideal compressor frequency in view of evaporator area in order to enhance energy-related properties. Developing a control algorithm depends on knowing the ideal frequency for every operational situation at several evaporator heat transfer zones. In order to accomplish aim, a Variable Frequency Drive (VFD) was applied to modify compressor frequency and a control system with solenoid valves controlled by pressure and temperature managed the evaporator heat transfer area. With a 50% evaporator capacity and the ideal cooling condition happening at 30 Hz, notable energy savings were obtained. With effective and quick cooling (a temperature difference of 40.7 ℃ in 25 min) the system reached the lowest energy consumption under these conditions. Among all the evaluated settings, these ones are the most efficient since they strike operating efficiency and cooling time.