AFUE
Last updated: November 16, 2019
Annual Fuel Utilization Efficiency. The ratio of annual output of useful energy or heat to the annual energy input to the furnace. The higher the AFUE, the more efficient the furnace.
Annual Fuel Utilization Efficiency. The ratio of annual output of useful energy or heat to the annual energy input to the furnace. The higher the AFUE, the more efficient the furnace.