What does AFUE stand for in furnace efficiency ratings?

What does AFUE stand for in furnace efficiency ratings?

• A. Annual Fuel Use Efficiency
• B. Annual Furnace Use Efficiency
• C. Average Fuel Utilization Efficiency
• D. Annual Fuel Utilization Efficiency

Answer: (D)

AFUE stands for Annual Fuel Utilization Efficiency. It’s a yearly efficiency metric that shows how effectively a furnace converts fuel into heat for the home, expressed as a percentage. The higher the AFUE, the more of the fuel energy becomes usable heat rather than being lost through exhaust. This helps compare furnaces on how well they use fuel over a typical year. The other phrasings don’t match the standard term—Utilization is the correct word, and it’s Annual rather than Average or Use.

AFUE stands for Annual Fuel Utilization Efficiency. It’s a yearly efficiency metric that shows how effectively a furnace converts fuel into heat for the home, expressed as a percentage. The higher the AFUE, the more of the fuel energy becomes usable heat rather than being lost through exhaust. This helps compare furnaces on how well they use fuel over a typical year. The other phrasings don’t match the standard term—Utilization is the correct word, and it’s Annual rather than Average or Use.