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DOE established a Working Group to negotiate amended energy conservation standards for six classes of walk-in cooler and freezer (walk-in) refrigeration systems. After holding a series of meetings as part of a negotiated rulemaking, the Working Group developed a Term Sheet containing a series of recommendations regarding potential energy conservation standards for these refrigeration systems and the current test procedure for evaluating the energy efficiency of a walk-in refrigeration system. This rulemaking proposes several test procedure amendments to implement these recommendations. These proposed amendments include certain changes to improve test procedure clarity, updating related certification and enforcement provisions to address the performance-based energy conservation standards for walk-in cooler and freezer equipment, and establishing labeling requirements that will aid manufacturers in determining which components would be considered for compliance purposes as intended for walk-in cooler and freezer applications. The proposal would also add certain equipment-specific definitions, remove the test method for refrigeration systems with hot gas defrost, and include a method to accommodate refrigeration equipment that use adaptive defrost and on-cycle variable-speed evaporator fan control.