Key signs that indicate you need a new furnace include an advanced age exceeding 15 to 20 years, frequent and increasingly expensive repairs, surging monthly utility bills due to lost mechanical efficiency, or the furnace blowing lukewarm air and short-cycling constantly. Additionally, loud banging, screeching, or rattling noises, visible rust or cracks on the metal casing, and a yellow burner flame instead of a crisp blue flame—which signals dangerous carbon monoxide risks—mean replacement is urgently required.
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