Published national guides put full system replacement commonly between $5,000 and $12,500 or more installed, with size, efficiency tier, fuel type, and duct work deciding where a house lands. Single component repairs run $150 to $650 for most findings, and a diagnosis visit runs $75 to $200. The honest quote separates equipment, duct corrections, and electrical or venting changes into lines, because the duct line is where replacement quotes quietly differ by thousands between companies measuring the same house.
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