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Freezers

In brief, a freezer works through the combined use of a heat pump, which transfers heat out of the area to be cooled, and a cooling agent such as Freon.  Cooling occurs by circulating the gas between high pressure and low pressure; when the gas drops to a lower state of pressure, the temperature drops too.  This process occurs within the compressor and a system of tubing which contains the gas. 

You may have noticed that a freezer in, say, your basement during the winter tends not to work as well.  This is because freezers work better in environments where the contrast between the temperature inside the freezer and that outside are more pronounced. 

Most freezer problems occur when some of its parts are either not properly maintained or have reached their life expectancy and need replacement.  For example, if your freezer stops running, it could be because the coils at the back are too full of debris (warning:  if looking at such things yourself, make sure the freezer is unplugged to avoid electrocution hazard).  Alternately, there could be a short in the wiring that needs to be located and repaired.  Other problems could occur with components such as the compressor motor or the evaporator fan, both of which can be replaced fairly easily by a professional.