What is the lifespan of a Goodman 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 Rheem and Ruud at 18 to 22 years but slightly shorter than premium Trane at 20 to 22 years. Goodman furnaces including GMSS92 single stage 92 percent AFUE, GMVC96 two-stage variable speed 96 percent AFUE, and GMVM97 modulating 98 percent AFUE are built with aluminized steel heat exchangers and standard components designed for 20-year service life. Lifespan depends heavily on maintenance, installation quality, climate, and usage hours. A Goodman 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, lifespan drops to 12 to 15 years. Goodman offers lifetime heat exchanger warranty on many models like GMVC96 and GMVM97 indicating expected long life. 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. Many owners report 18 to 22 year lifespan.
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