How long Ruud furnaces last 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 identical to Rheem furnaces since same factory and components, slightly shorter than premium Trane at 20 to 22 years but longer than value Goodman at 15 to 18 years. Ruud furnaces including Classic R92 single stage 92 percent AFUE, Classic Plus R96V two-stage variable speed 96 percent AFUE, and Ultra R98V modulating 98 percent AFUE are built with aluminized steel heat exchangers and standard components designed for 20-year life. How long they last depends on maintenance, installation quality, and climate. A Ruud 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. Ruud offers lifetime heat exchanger warranty on many models like R96V and R98V, indicating confidence in longevity. Common parts failing first include igniter after 5 to 8 years at 100 to 200 dollars and blower motor after 12 to 15 years at 400 to 700 dollars.
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