While packaged systems used in walk-ins are impacted by the standard and would be evaluated as a pre-matched system, the DOE standard does not mandate use of packaged systems. The standard allows for use of split systems with separate unit coolers and condensing units that meet the minimum AWEF values.The AWEF calculation is similar for independent components, and there is no AWEF advantage to preselecting matched or packaged systems versus rating them as individual components.