What does "AFUE" indicate in HVAC systems?

"AFUE," which stands for Annual Fuel Utilization Efficiency, is a critical measure in HVAC systems, particularly in furnaces and boilers. It indicates the efficiency with which a heating appliance converts fuel into usable heat over the span of a year. The AFUE percentage reflects how much of the fuel consumed is transformed into heat for the space being heated compared to the total fuel used, which includes lost energy in the flue gases, etc.

A higher AFUE rating means that the appliance is more efficient, wasting less fuel and providing more heat. This is particularly important for homeowners and businesses looking to save on energy costs and improve heating performance.

Understanding AFUE is essential for making informed decisions when selecting heating systems, as it directly relates to energy consumption and operating costs.