Refrigerator

A refrigerator having a fresh food compartment adapted for maintaining the contents thereof at a temperature above freezing, a vapour compression refrigerator system, air circulation means for causing a circulating airflow between said compartment and the evaporator of said refrigerator system, and a controller for controlling said air circulation means and said refrigerator system, characterised in that in a refrigeration mode with said refrigeration system and air circulation means active, said evaporator operates with a surface temperature within 10° C. of the temperature desired in the said fresh food compartment and a supply of air is maintained over said evaporator and into said fresh food compartment, and in a defrost mode said controller deactivates said vapour compression refrigeration system, or operates it without significant heat extraction at said evaporator, and activates said air circulation means to circulate air above 0° C. over said evaporator, and there is no other means of heating said evaporator.