Plug-in refrigerated display cabinets are widely used in supermarkets. Since these cabinets do not have a drainage system connected to the mains, the accumulated defrost water is removed with the help of PTC resistance. The energy consumption of the PTC resistor constitutes nearly 20% of the total energy consumption. Considering that the final energy consumption is met from primary energy sources; With the decrease in fossil fuels and the increase in energy costs, it is necessary to use the consumed energy more efficiently. In this study, the refrigerant in superheated vapor state at the compressor outlet was passed through the compressor discharge line pipes and the stagnant water in the condensation pan. By adding additional fins to the discharge pipes in the condensation pan, heat transfer is increased and energy consumption is reduced. In this way, the energy consumption of the cabinet was reduced, and the energy class, which was "E" in the current system, was upgraded to the "D" class with the new design. Thus, an environmentally friendly design has been introduced and 11,138 kg/day CO2 emissions for 1 refrigerator have been reduced by reducing primary energy consumption.