The average lifespan of a residential furnace typically ranges between 15 to 20 years, though units can occasionally last up to 25 years if they receive regular, professional maintenance and routine servicing. Gas and oil furnaces require annual tune-ups to inspect heat exchangers, clean burners, test safety switches, and replace air filters. Actual longevity depends heavily on the quality of initial installation, frequency of filter changes, local climate harshness, and overall runtime hours during severe winter heating seasons.
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