DESC: The GE Profile PDS20SBS bottom-freezer refrigerator features GE's ClimateKeeper System - the Best Temperature Management System You Can Buy! The ClimateKeeper System combines 3 elements to deliver unmatched temperature management. Upfront digital controls are precise and easy to use. More electronic sensors than competitor's systems, and each is positioned for maximum effectiveness. Multiflow air system includes more vents than competitors' systems, and it uses exclusive fresh food and variable-speed freezer fans to keep temperatures consistent throughout the refrigerator.