Heat exchanger arrangement for a refrigerator apparatus, which evaporator comprises an evaporator tube (2) for conducting a refrigerating medium; a heat exchanger (5, 11) with at least one heat conducting member (7, 11), which is arranged in heat conducting contact with a portion of the evaporator tube and; a heat generating element (10) for defrosting the heat exchanger, which element is arranged in heat conducting contact with the heat conducting member. For optimizing defrosting, the heat-conducting member (7, 11) is arranged essentially between the heat generating element (10) and the evaporator tube (2).