It is generally not worth investing significant repair money into a 30-year-old furnace, and proactive replacement is strongly advised. A 30-year-old furnace operates at drastically lower efficiency ratings (often 60% to 70% AFUE) compared to modern condensing furnaces that exceed 95% to 98% AFUE, resulting in massive energy waste and high utility bills. Furthermore, a furnace of that age carries a severe risk of a cracked heat exchanger, which can leak lethal carbon monoxide into the home. Replacing it ensures safety and modern efficiency.
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