If you are shopping for a new refrigerator, you may be wondering what a frost free refrigerator is. "Frost free" is a term that has been used in the refrigerator industry for decades. Many older style refrigerators and some modern mini refrigerators and freezer-only units require manual defrost. In these non frost free models, frost periodically builds up in the freezer over the coils and it needs to be manually defrosted. This can be inconvenient as you have to remove all of the food from the freezer in order to do this.