When you are shopping for a new HVAC system, be sure to have a look at the EnergyGuide label. Created by the U.S. Department of Energy, the EnergyGuide label provides an easy way to compare the energy usage of a major appliances to similar products, helping you to choose the one with the best energy efficiency and features for your budget. The labels are standard on air conditioners, heat pumps, furnaces and other major appliances, and they contain similar information for each.