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  1. Auto-defrost, automatic defrost or self-defrosting is a technique which regularly defrosts the evaporator in a refrigerator or freezer. Appliances using this technique are often called frost free, frostless, or no-frost.
    en.wikipedia.org/wiki/Auto-defrost
    Refrigerators and freezers with auto-defrost usually have a temperature control mechanism that tells the unit when to stop cooling. There’s still power running to the unit, but when the internal temperate reaches the specified setting, it will stop blowing cool air into the main compartment until the evaporator has defrosted.
    fredsappliance.com/service/defrost-works-refrigerat…
    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.
    home.howstuffworks.com/question144.htm
    Self-defrost (or frost-free) is a cleaning design feature in freezers. Self-defrosting is an automatic defrost cycling process requiring no intervention from the user. It works by heating coils inside the freezer at regular intervals to prevent frost build-up.
    www.thespruce.com/self-defrost-or-manual-defrost …
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