Refrigerating circuit, comprising: a first compressor unit, a condenser/gas cooler, and a collecting container, a normal refrigeration branch coupled between the collecting container and the suction side of the at least one first compressor unit, the normal refrigeration branch comprising at least one cold consumer having an evaporator with an expansion device arranged before it; and a freezing branch coupled between the collecting container and the suction side of the first compressor unit, the freezing branch comprising at least one cold consumer having an evaporator with an expansion device arranged before it, a second compressor unit and a desuperheating device, the refrigerant circuit further comprising refrigerant conduits for connecting said elements and for circulating a refrigerant therethrough, a defrosting line connected between a branching-off point in the pressure line after the first compressor unit and at least one attaching point between the expansion device (16; 22) and the evaporator (18; 24) of one of the cold consumer units, wherein a pressure reduction valve is arranged in the defrosting line, characterized in that the refrigerant circuit further comprises: a control unit being configured to operate at least one of the evaporators (18, 24) in a defrosting mode, in which a partial flow of the pressurized gaseous refrigerant leaving the first compressor unit is led to the respective evaporator (18, 24) through the defrosting line, wherein the pressure of the refrigerant is reduced by the pressure reduction valve and the refrigerant defrosts the respective evaporator (18, 24) while maintaining its gaseous state and flows back to the respective compressor unit (4, 28); wherein the control unit is configured to reduce the end pressure value of the first compressor unit during the defrosting mode in order to reduce the pressure of the second compressor unit and raise the performance of the second compressor unit. a first compressor unit, a condenser/gas cooler, and a collecting container, a normal refrigeration branch coupled between the collecting container and the suction side of the at least one first compressor unit, the normal refrigeration branch comprising at least one cold consumer having an evaporator with an expansion device arranged before it; and a freezing branch coupled between the collecting container and the suction side of the first compressor unit, the freezing branch comprising at least one cold consumer having an evaporator with an expansion device arranged before it, a second compressor unit and a desuperheating device, the refrigerant circuit further comprising refrigerant conduits for connecting said elements and for circulating a refrigerant therethrough, a defrosting line connected between a branching-off point in the pressure line after the first compressor unit and at least one attaching point between the expansion device (16; 22) and the evaporator (18; 24) of one of the cold consumer units, wherein a pressure reduction valve is arranged in the defrosting line, characterized in that the refrigerant circuit further comprises: a control unit being configured to operate at least one of the evaporators (18, 24) in a defrosting mode, in which a partial flow of the pressurized gaseous refrigerant leaving the first compressor unit is led to the respective evaporator (18, 24) through the defrosting line, wherein the pressure of the refrigerant is reduced by the pressure reduction valve and the refrigerant defrosts the respective evaporator (18, 24) while maintaining its gaseous state and flows back to the respective compressor unit (4, 28); wherein the control unit is configured to reduce the end pressure value of the first compressor unit during the defrosting mode in order to reduce the pressure of the second compressor unit and raise the performance of the second compressor unit. a control unit being configured to operate at least one of the evaporators (18, 24) in a defrosting mode, in which a partial flow of the pressurized gaseous refrigerant leaving the first compressor unit is led to the respective evaporator (18, 24) through the defrosting line, wherein the pressure of the refrigerant is reduced by the pressure reduction valve and the refrigerant defrosts the respective evaporator (18, 24) while maintaining its gaseous state and flows back to the respective compressor unit (4, 28); wherein the control unit is configured to reduce the end pressure value of the first compressor unit during the defrosting mode in order to reduce the pressure of the second compressor unit and raise the performance of the second compressor unit.