All major home appliances must meet the Appliance Standards Program set by the US Department of Energy (DOE). Manufacturers must use standard test procedures developed by DOE to prove the energy use and efficiency of their products. Test results are printed on yellow EnergyGuide label, which manufacturers are required to display on many appliances. This label estimates how much energy the appliance uses, compares energy use of similar products, and lists approximate annual operating costs. Your exact costs will depend on local utility rates and the type and source of your energy.
An ENERGY STAR qualified appliance must carry the EnergyGuide label. EnergyGuide labels frequently note whether the product is ENERGY STAR qualified.