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AFUE stands for Annual Fuel Utilization Efficiency

This is a measurement of a gas furnace's efficiency in converting fuel to energy, by projecting the average thermal efficiency for a complete heating season.

A higher AFUE rating means greater energy efficiency. 80% AFUE = 20% escapes home.

Two Things to Remember

Because electric furnaces don’t utilize combustion to generate heat, these units typically have AFUE ratings above 90 percent. However, since electricity generally costs substantially more than gas, a gas-fired furnace with a lower AFUE is usually the more cost-efficient choice.

Furnace efficiency is expressed by factors other than the AFUE rating. The furnace blower fan's electrical consumption isn’t included when calculating the rating. Yet, it makes a substantial contribution to furnace operating cost.

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Optional variable-speed ECM blowers that reduce electricity use as much as 75 percent less also help reduce utility expenses.

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