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In terms of energy efficiency, appliances such as refrigerators, air conditioners, electric water heaters, dishwashers, and washing machines must meet federal minimum energy performance standards and bear the EnergyGuide label; “ Energy Star ” Although it is voluntary, some states make it mandatory and it is widely accepted around the world. Washing machines, dishwashers, refrigerators and freezers, room air conditioners, dehumidifiers, room air purifiers, ceiling fans are “ Energy Star ” The product range.