80% AFUE or higher
With heating systems, the efficiency of a furnace is determined by is AFUE (Annual Fuel Utilization Efficiency); a gas furnace’s efficiency in converting fuel to energy. The higher the AFUE, the more energy efficient the furnace is.
A gas furnace with an 80% AFUE rating means that 80 cents of every $1.00 of heating energy expense warms the home. A gas furnace with a 95% AFUE rating means that 95 cents of every $1.00 of heating energy expense warms the home. 95% AFUE furnaces are more energy efficient.
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