What does AFUE mean?

AFUE is an acronym for Annual Fuel Utilization Efficiency.

For example, if you get a bill for $100 for using your furnace, which is 50% efficient, you put $50 worth of heat in your home and $50 worth of heat outside.

A high-efficiency furnace typically has an AFUE rating of 90% or higher, meaning it converts 90%+ of its fuel into usable heat. These systems are ENERGY STAR® certified and can significantly reduce your energy bills.