NAECA was enacted in 1987 and amended in 1988. Minimum efficiency standards have been established for air conditioners, heat pumps, dishwashers, clothes washers and dryers, furnaces, refrigerators and freezers, water heaters, and gas direct heaters. The DOE has not established minimum efficiency standards for televisions, microwave ovens, ranges and ovens. Appliance manufacturers have reduced energy consumption using improved insulation, more efficient motors, electronic controls, efficient compressors, and non-continuous burning pilots.Energy efficient appliances can prevent pollution by reducing the demand for electricity. From 1990 to 2015, the cumulative energy impact of the National Appliance Energy Conservation Amendments of 1988 is estimated to be an 0.8 percent savings of all fuels. However, energy efficient residential appliances are only one factor in the total energy consumption equation.