HVAC ductwork costs about $500-$2,000 for targeted repairs and $2,000-$7,500 for many whole-home replacements. Total price depends on home size, duct material, accessibility, insulation needs, and how much of the system must be replaced.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Minor duct repair | $200 | $700 | $2,000 | Sealing or replacing a limited run |
| Whole-home replacement | $2,000 | $5,500 | $12,000 | Varies with layout and access |
| Installed ductwork | $15 per linear ft | $30 per linear ft | $55 per linear ft | Typical mixed-material installation |
| Insulation upgrade | $1 per sq ft | $2.50 per sq ft | $5 per sq ft | Depends on duct location and insulation level |
What homeowners pay to replace HVAC ducts
A typical 1,500- to 2,000-square-foot home may cost $3,000-$7,500 to replace accessible ductwork with standard materials. A smaller job replacing one or two runs may be $500-$1,800, while extensive work in a large or difficult-to-access home can exceed $10,000. A practical planning range for a full replacement is $2-$6 per square foot of home area.
That estimate generally assumes standard residential heating and cooling, ordinary ceiling or crawl-space access, and no major structural or equipment changes. A contractor may price by the linear foot, by duct run, or as a complete system quote; the estimate should identify which approach is being used.
Assumptions: Typical U.S. labor rates, standard duct materials, and normal access; local prices and project scope vary.
Where sheet metal, flex duct, and labor enter the quote
Material choice affects both the initial estimate and installation time. Flexible duct is often less expensive and quicker to install in suitable spaces. Sheet metal costs more but may be specified for durability, fire-code requirements, or particular system designs. Labor and access can outweigh the price difference between duct materials.
| Quote item | Typical price | What changes the charge |
|---|---|---|
| Flexible duct, installed | $15-$30 per linear ft | Diameter, insulation, and routing |
| Sheet-metal duct, installed | $25-$55 per linear ft | Fabrication, fittings, and bends |
| Labor | $75-$150 per hour | Crew size and access difficulty |
| Sealing and balancing | $200-$800 per system | Number of joints and registers |
| Removal and disposal | $300-$1,500 | Old duct volume and disposal needs |
Some contractors include labor, fittings, sealing, and testing in a per-foot rate; others list them separately. A two-person crew working 10-20 hours at a combined billed rate of $150-$300 per hour would represent roughly $1,500-$6,000 in labor, though actual billing structures differ.
How square footage, duct length, and access change estimates
Home area is only a rough indicator: a 2,000-square-foot house with a compact layout may need less duct than a smaller home with long, branching runs. A system with 100-200 linear feet of duct might cost roughly $2,500-$8,000 installed, depending on material and site conditions. Longer runs and concealed routes generally increase both material use and labor hours.
Diameter and system capacity matter too. A 6-inch branch run is usually less costly than a larger trunk line, while a home needing multiple trunk lines, added returns, or separate zones requires additional fittings and labor. In an attic or crawl space with less than 24 inches of working clearance, labor may rise 15%-40% compared with open, accessible runs. Mold, damaged framing, or asbestos-containing materials require separate evaluation and may add substantial expense.
Which repair charges and removal fees can add up
Sealing a few accessible joints may cost $200-$600, while replacing a damaged branch and reconnecting registers can run $500-$1,800. Removing old ductwork typically adds $300-$1,500, and extensive demolition or difficult disposal can push the fee higher. Ask whether removal, disposal, sealing, and airflow testing are included in the written quote.
New insulation may add $1-$5 per square foot of duct surface, not home floor area. A contractor might also recommend a return-air addition, new registers, or access panels; these items can add $150-$1,000 or more depending on quantity and construction work. Existing HVAC equipment replacement is normally a separate expense.
When a duct repair costs less than full replacement
Repair is often the lower-cost choice when the duct system is structurally sound and damage is limited to a few loose joints, crushed sections, or uninsulated runs. A diagnostic visit may cost $75-$250, sometimes credited toward approved work. For ducts with widespread leaks, deteriorated insulation, or repeated failures, a repair quote should be compared with replacement rather than treated as an isolated fix.
Professional sealing commonly costs $300-$1,500 for accessible residential ductwork; extensive sealing or aerosol-based methods can cost more. Replacing only failed sections can preserve the budget when the remaining ducts are correctly sized and in good condition. Have the contractor explain how the proposed repair addresses airflow and leakage, not just visible damage.
How regional labor rates shift ductwork pricing
Prices in dense metropolitan areas and high-cost coastal markets may run 15%-30% above the national middle range, while some rural markets may be 10%-20% lower. These differences reflect wages, travel time, contractor availability, and local code requirements, not just material prices. Compare quotes from contractors working in the same market and with similar project scope.
Ask each bidder to list duct length, material, insulation, removal, sealing, permits if applicable, and any work excluded from the price. A low total may omit return ducts or testing, while a higher quote may include those tasks. Confirm that the proposed duct design matches the HVAC equipment and applicable local requirements.
Which ductwork choices can lower the final price
Keep the project limited to necessary runs, avoid relocating registers without a clear reason, and compare standard insulated flex duct with sheet metal where both are appropriate. Clearing stored items from attic or crawl-space access can reduce setup time. Scheduling outside peak heating or cooling demand may improve availability, although savings depend on local contractor schedules.
Obtain at least three itemized estimates and compare equivalent materials, duct lengths, insulation, disposal, and testing. Do not compare total prices until the included work is aligned line by line. Avoid paying for upgraded materials or air-quality add-ons unless the contractor explains the specific performance or code need they address.
How long a residential duct replacement usually takes
A straightforward replacement in an accessible home may take one to two days with a two- or three-person crew. A complex layout, tight crawl space, multiple floors, or major removal can extend work to three or more days. Labor time affects the estimate, but rushed installation can leave joints poorly sealed or airflow improperly balanced.
Ask whether the crew will test airflow and inspect connections after installation. If work requires opening finished ceilings or walls, separate the duct quote from patching and painting, which may add $300-$2,000 depending on the area. Keeping that scope explicit makes it easier to compare bids and plan the total project budget.