"ABSTRACT The objective of this project was to compare a typical open refrigerated display case line-up to a typical glass-doored refrigerated display case line-up with the aim of quantifying the difference in overall energy consumption and the difference in food product sales for each case type. For this research project@ two supermarkets were identified as test sites: one supermarket received a new@ open refrigerated display case line-up and the other supermarket received a new@ doored refrigerated display case line-up. Per unit length of case line-up@ the open display case line-up consumed approximately 1.3 times more energy than the doored display case line-up. Comparison of product sales between the open and doored display case lineups showed that ""doored versus open"" had no effect on product sales. Finally@ the door opening duration data collected in this study from the doored display case line-up validate the door opening procedure used in the method of test described in ANSI/ASHRAE Standard 72-2005 (ASHRAE 2005)."