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High efficiency furnaces are gas units that use less fossil fuel to operate when compared with their traditional, single-stage counterparts. These units have an AFUE, or annual fuel utilization efficiency of at least 80%, with most on today's market having 90%. The AFUE rating indicates the amount of heat delivered as opposed to how much heat is lost or used. High efficiency furnaces have two-stage burners, which allow the furnace to operate at a lower level when weather outside is milder. Further augment efficiency are optional two-stage blowers which deliver warm at at a higher rate, also when needed.

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