For any electrical appliance labeled with Energy Star, the average efficiency is usually 10 to 20 percent higher than their non-labeled counterparts. However, this varies from appliance to appliance. For example, an energy star refrigerater must be at least 15% more efficient than minimum federal efficiency standards. Furnaces that qualify for the Energy Star label are also about 15% more efficient. Light bulbs must meet a variety of different standards and guidelines to ensure that they are Energy Star quality. Office equipment must be more efficient and must also enter a “sleep” mode when not in use to earn an Energy Star label.
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