Many commercial refrigerators use direct cooling, i.e., convection processes, to circulate cold air around the unit. This is an energy-efficient process that is widely preferred for heavy-duty industrial refrigerators. However, products kept in direct cool refrigerators come out with a layer of icing and even icicles and need longer to be defrosted. Frost-free cooling, on the other hand, eliminates the formation of icing, maintaining food at the proper temperatures. This keeps food fresh for longer and makes it easier to handle once out of the fridge.