What AC duct replacement costs and what drives the price
AC duct replacement cost is driven by home size, how accessible the existing ductwork is, and which duct material the job calls for. A single-story house with an open basement runs far less than a two-story home with finished walls and sheet metal throughout. Regional labor rates push the final number in either direction.
What determines the cost of duct replacement?
Home size is the biggest single driver.
More square footage means more linear footage of duct, more materials, and more labor hours. A second story adds complexity because runs through interior walls and across ceilings take longer to complete than runs through an open basement or crawlspace. Accessibility matters just as much as size. Ducts buried in finished walls or tight attic spaces require demolition and patching that open, unfinished spaces do not. The material you choose also shifts the number. Flexible duct, rigid sheet metal, and fiberboard each carry different material costs and installation times. Finally, labor rates vary by region, and what a contractor charges in one market can differ substantially from what the same job costs elsewhere. A single-story house with an open basement and flexible duct runs lands at a very different place than a two-story home with finished walls and sheet metal throughout.
How does a contractor quote duct replacement accurately?
Any number a contractor gives you is only as reliable as the inspection behind it.
Before anyone can quote the job accurately, they need to get into the attic or crawl space, measure static pressure, check for leaks, and confirm that the existing layout is actually moving conditioned air where the rooms need it. Some trunk lines are worth keeping; others look serviceable but are failing in ways that change the entire scope of the replacement. You cannot make that call yourself. Pressure measurement requires specialized tools, and working in attic or crawl space conditions for long enough to do it properly is not something most homeowners can safely do. The trained eye that separates a duct that looks worn from one that is genuinely compromising the system is what makes a quoted price trustworthy.
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