AFUE, or Annual Fuel Utilization Efficiency, is a measure of a furnace’s efficiency in converting the energy in its fuel to heat over a typical year. It is expressed in percentage, with a higher AFUE rating indicating a more efficient furnace. For instance, an AFUE rating of 98% means that 98% of the fuel is converted into heat, with only 2% lost. This rating is crucial as it directly impacts energy costs and environmental footprint. Amana’s high-efficiency furnaces, with AFUE ratings as high as 98%, offer homeowners significant savings on energy bills and are an eco-friendly heating solution.