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What is the efficiency rating of a high efficiency furnace?

April 26, 2017efficiency furnace high rating

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What is the efficiency rating of a high efficiency furnace?

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The efficiency rating is called annual fuel utilization efficiency or afue. For residential systems in the USA, the minimum is 80%. There is no standard for what is considered “high efficiency”. The range of efficiencies goes up to about 96% for gas furnaces.