What is the lifespan of a Rheem furnace is 18 to 22 years with normal residential use and proper maintenance, which is similar to industry average for gas furnaces of 15 to 20 years and similar to premium brands like Trane and Carrier at 18 to 22 years but slightly longer than value brands like Goodman at 15 to 18 years. Rheem furnaces including Classic R92 single stage 92 percent AFUE, Classic Plus R96V two-stage variable speed 96 percent AFUE, and Prestige R98V modulating 98 percent AFUE are built with aluminized steel heat exchangers and standard components designed for 20-year life. Life depends heavily on maintenance, installation quality, and usage. A furnace that has annual maintenance with filter changed every 2 to 3 months, burners cleaned, and heat exchanger inspected, with proper sizing via Manual J and correct airflow of 400 CFM per ton, will last 20 to 22 years, while a furnace with neglected filter that causes overheating and high limit trips, poor installation with undersized ductwork causing high static pressure, and short cycling will last only 12 to 15 years. Rheem offers lifetime heat exchanger warranty on many models like R96V and R98V, indicating confidence in longevity. Common parts that fail first include igniter after 5 to 8 years at 100 to 200 dollars, flame sensor after 1 to 2 years needing cleaning, and blower motor after 12 to 15 years at 400 to 700 dollars.
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