A frost-free freezer has three basic parts:

  a.. A timer
  b.. A heating coil
  c.. A temperature sensor
Every six hours or so, the timer turns on the heating coil. The heating coil 
is wrapped among the freezer coils. The heater melts the ice off the coils. 
When all of the ice is gone, the temperature sensor senses the temperature 
rising above 32 degrees F (0 degrees C) and turns off the heater.
Heating the coils every six hours takes energy, and it also cycles the food 
in the freezer through temperature changes. Most large chest freezers 
therefore require manual defrosting instead -- the food lasts longer and the 
freezer uses less power.

http://home.howstuffworks.com/question144.htm 


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