ELI5: Why do grocery stores have those open refrigerators to display cold items? Isn't it a huge waste of energy? explainlikeimfive

My local health food co op even uses these--they have no doors on the display cold cases and let tons of cold air out. Why is this an acceptable practice?

Submitted January 14, 2015 at 07:30PM by FartsInPonytails http://ift.tt/1C0oLPY explainlikeimfive