In a first step, the optimum melting temperature of the PCM to meet an average temperature Tm of about 5 °C as well as a maximum temperature of 8 °C in the fresh-food compartment for determining the power consumption under standard con- ditions in accordance to DIN EN 62552 had to be found. Fig. 4 shows the results for the integration of different PCM in a K-12020S-1 with phase change temperatures of −2 °C,−4 °C and −6 °C, cf. Fig. 3.The comparable evaporator temperature ampli- tudes are the result of the same thermostat settings, whereas the switch-on has to ensure automatic defrosting (i.e. >0 °C) of the evaporator and at switch-off the different PCM had to be solidified (i.e.