What's the average 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 matches premium brands like Trane and Carrier at 18 to 22 years but is longer than budget 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 service life. The actual life depends heavily on factors like maintenance, installation quality, climate, and usage hours. A Rheem furnace that receives annual professional tune-up at 100 to 150 dollars, has filter changed every 2 to 3 months to prevent overheating and high limit switch tripping that cracks heat exchanger, is correctly sized via Manual J load calculation to avoid short cycling that causes thermal stress, and operates in moderate climate where heating season is 3 to 4 months will last 20 to 22 years. If filter neglected, ductwork undersized causing high static pressure above 0.5 inches water column, and installed poorly with incorrect gas pressure, life drops to 12 to 15 years. Rheem offers lifetime heat exchanger warranty on many models indicating expected long life. Common parts failing first include igniter after 5 to 8 years at 100 to 200 dollars.
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