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Thank you for taking the time to leave us your question. This model is a frost-free unit that utilizes Frost Guard technology. Adaptive Defrost (Frost Guard) means that the refrigerator will only defrost as needed. It accounts for door openings and usage to determine when it is necessary to defrost and how long the defrost cycle needs to run. If the refrigerator is not being frequently used (for example, your family is on vacation), it will not defrost as often. The Adaptive Defrost (Frost Guard) feature also utilizes a "Pre-Chill" function to lower the freezer temperature prior to the defrost cycle. This lowering of the freezer temperature allows the freezer to return to its set temperature point more quickly once the defrost cycle is complete. All of this amounts to minimal thawing of foods and refreezing during the defrost cycle. The result is that it reduces freezer burn.
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