High-efficiency furnaces save energy by operating with less heat waste than conventional furnaces. New heating technology and components make this possible. Annual Fuel Utilization Efficiency (AFUE) is a measurement of how much heat a furnace can create from the fuel being consumed.
High-efficiency furnaces have an AFUE of at least 90% and sometimes as high as 98.5%! Traditional furnaces can have an AFUE rating as low as 80%. Because of this difference in fuel-burning efficiency, a new high-efficiency furnace can save you over 12% on your energy bill!