In the last few years the energy consumption for refrigeration has increased rapidly. As a consequence, care should be taken to ensure that these are energy-efficient devices. Energy savings can be achieved most easily in those parts of the refrigerating system where the energy consumption is the largest.In addition to a suitable design of the refrigerating system components, the operating parameters also play a significant role. This paper analyses the impact of refrigerating temperature or evaporating temperature on the energy consumption. It is well known that decreasing the evaporating temperature reduces the coeficient of performance. An analysis of the impact of evaporating temperature has shown that its reduction is rapidly accelerated by water vapor condensation from the air frosting of the evaporator, resulting in extra energy consumption for defrosting the evaporator.