The use of energy has become a commonly discussed issue with environmental and economic concerns. Everyday a significant amount of energy is used for commercial equipment in restaurants, grocery stores, convenience stores, and warehouses. Prior to 2006, there had not been any set regulations on energy usage for commercial refrigeration.
California was one of the first states to set energy regulations for walk-in coolers and freezers. They previously required an envelope insulation rating of R-28 for refrigerators and R-36 for freezers. California was also one of the first to require electronically commutated motors or permanent split capacitor-type motors for refrigeration. Before more states could pose their own requirements on energy consumption, the federal EISA (Energy Independence and Security Act) agreement was signed in 2007. California has fully accepted the EISA requirements, amending their previous appliance energy code.