What is the average lifespan of a Ruud 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 identical to Rheem furnace lifespan since same factory and components, and similar to premium brands like Trane and Carrier at 18 to 22 years but longer than budget brands like 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 service life. Average lifespan depends heavily on maintenance, installation quality, climate, and usage hours. 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 cracks, 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, average lifespan drops to 12 to 15 years. Ruud offers lifetime heat exchanger warranty on many models indicating expected long life.
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