Replacing AC ducts typically costs between $1,200 and $8,500 depending on home size, duct type, and labor complexity. This article lists realistic AC duct replacement cost ranges and the main drivers contractors use to price jobs so homeowners can budget and compare quotes.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Full duct replacement (single-story 1,200 sq ft) | $1,200 | $3,500 | $6,000 | Assumptions: basic flexible ducts, standard access, Midwest labor. |
| Full replacement (two-story 2,500 sq ft) | $2,800 | $5,500 | $8,500 | Assumptions: some sheet metal, attic runs, moderate insulation. |
| Partial replacement / repairs | $300 | $900 | $2,200 | Per zone or several runs fixed or replaced. |
| Air sealing & insulation add-on | $200 | $800 | $2,000 | Per attic/ crawlspace project. |
Typical Total Price for Replacing Ductwork in a 1,200–2,500 sq ft Home
Most homeowners pay between $1,200 and $6,000 for a complete duct replacement in a typical single- or two-story home, depending on material and access.
Estimated ranges assume full replacement of supply and return trunks, basic flexible or spiral metal ducts, standard boot and register replacement, and normal attic or basement access. Higher-end sheet-metal designs, complex layouts, or extensive rerouting push totals above the high end.
Assumptions: Average U.S. labor rates, mixed materials, normal access.
Line-Item Cost Breakdown: Materials, Labor, Equipment, Disposal, Permits
Breaking a quote into materials, labor, equipment, delivery/disposal, and permits helps spot markup and trade tasks.
| Item | Materials | Labor | Equipment | Delivery/Disposal | Permits |
|---|---|---|---|---|---|
| Flexible duct runs (per linear ft) | $4-$9 per ft | $2-$6 per ft | $0.50-$1 per ft | $0.10-$0.50 per ft | Usually none |
| Sheet metal trunk (per linear ft) | $12-$30 per ft | $10-$25 per ft | $1-$3 per ft | $0.20-$1 per ft | $0-$150 |
| Registers & boots (per fixture) | $15-$80 each | $20-$75 each | $0 | $0 | Usually none |
| Air sealing / insulation (per area) | $0.50-$2 per sq ft | $40-$95 per hour | $50-$250 rental | $50-$300 | $0-$100 |
Which Variables Change the Final AC Duct Replacement Quote
Access, duct material, and the number of linear feet are the strongest price variables—each can change the quote by 20–200%.
Examples: replacing 200 linear ft of flexible duct vs. 200 linear ft of sheet metal typically shifts materials+labor from roughly $1,200 to $4,400. If attic access requires scaffolding or floor cuts, add $300-$1,200.
Two niche drivers: high-efficiency insulated duct (R-6 or higher) adds $1.50-$4 per linear ft; long-run returns over 35 ft often require bigger trunk sizing and add $500-$1,500.
How Home Size, Number Of Vents, And Runs Affect Price
House square footage and the number of supply/return runs set most total estimates—expect $1,000-$3,500 for 1,000–1,800 sq ft, $3,000-$6,000 for 1,800–2,800 sq ft.
Typical per-vent cost: $75-$250 installed for replacing register, boot, and short duct run. Adding 6–12 vents increases totals significantly; long linear footage (100+ ft) usually raises labor and material by 15–40%.
Practical Ways To Reduce AC Duct Replacement Price
Scope control and targeted repairs—replace only damaged runs and prioritize sealing—often cut the bill by 30–60% versus full replacement.
Strategies: verify which runs leak or are undersized with a diagnostic test, accept insulated flex where possible, do attic prep and clear access before contractor arrival, and get multiple quotes with itemized line items. Avoid unnecessary upsized trunking unless system capacity requires it.
Regional Price Differences And Seasonal Scheduling Tips
Expect 10–30% higher prices in coastal metro areas and cold-climate regions due to labor and material premiums.
Example deltas: Northeast/California often +15–30% vs. Midwest; rural areas can be -5–15% but may have minimum charges. Scheduling off-peak (spring or fall) can reduce labor rates or get faster appointment windows.
Common Add-Ons, Time Estimates, And Typical Job Examples
Most full replacements take 1–4 days depending on crew size and complexity; add-on sealing, insulation, or mold remediation raises time and price.
| Example Job | Specs | Labor Time | Price |
|---|---|---|---|
| Small repair | 3 runs, replace flex, seal boots | 2–4 hours | $300-$800 |
| Full 1,300 sq ft replacement | Flexible trunks, 8 vents, attic work | 1–2 days (2 techs) | $1,200-$3,500 |
| Large 2,800 sq ft remodel | Sheet metal trunks, reroute, insulation | 2–4 days (3–4 techs) | $4,000-$8,500 |
Typical hourly rates: $75-$125 per hour for experienced HVAC techs; minimum charges often $250-$500.