If you own a freezer, whether that be an upright or chest freezer, you may be wondering why the exterior walls and the top seem to be hot. A freezer that is hot to the touch on the sides and top is a good thing. In fact that heat means that the freezer is working properly. Let me explain.
Most refrigerators today use a condenser to remove the heat from the refrigerant that is located in the base of the refrigerator behind the grill near the compressor. A fan blows across the condenser which is a group of coils with fins on them to allow the heat to be drawn off of the refrigerant and put back into the room. This allows the refrigerator to keep your beer cold.
Because freezer walls are so thin, freezer manufactures needed to figure out a way to prevent the cold air inside the freezer from effecting the exterior walls. If the exterior walls got cold moisture would form on them causing the freezer cabinet to rust. You may have noticed that when you have a glass with ice in it moisture condenses around the outside of the glass. That’s because the ice in the glass makes the exterior part of the glass so cold that the moisture around it condenses from a gas that we know as humidity, to a liquid. The liquid water then runs down the side of the glass. Mostly that’s why we need coasters.