AC Flex Duct Prices, Cost Ranges, and What Drives the Final Price 2026
Buyers typically pay $3-$12 per linear ft for AC flex duct, with total jobs from $150 to $2,500 depending on scope and materials. This article on AC flex duct prices summarizes typical totals, per-foot rates, and the main drivers: length, diameter, insulation, and labor access.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Supply-only flex duct (per linear ft) | $3 | $6 | $12 | Assumptions: 6″–12″ diameter, standard foil-faced insulation. |
| Installed flex duct (per linear ft) | $8 | $15 | $30 | Assumptions: includes labor, basic connectors, residential attic access. |
| Small replacement job (single run) | $150 | $350 | $800 | Assumptions: 10–30 ft run, simple access, standard materials. |
| Full system rework (whole-house) | $800 | $1,800 | $2,500 | Assumptions: 8–10 runs, attic or crawlspace, mid-range materials. |
Typical Installed Price For A Single Flex Duct Run
For a common residential job—a single supply run 10–30 linear ft—expect an installed cost of $150-$800, with the average around $350. This range assumes a 6″–10″ duct, one register, standard foil-faced insulation, and easy attic or basement access.
Assumptions: single-story home, Midwest labor, minimal fittings.
Material, Labor, Equipment, Permits: What Each Part Costs
| Materials | Labor | Equipment | Permits |
|---|---|---|---|
| $3-$12 per linear ft (duct, collars, tape) | $75-$125 per hour; $50-$250 per run labor | $0-$150 (ladders, basic tools; rental if large job) | $0-$200 (local mechanical permit for major work) |
Materials typically make up 30%-60% of small jobs while labor dominates larger system replacements.
Assumptions: labor_hours = 1–8 depending on runs; hourly_rate = $75–$125.
How Length, Diameter, And Insulation Thickness Change The Quote
Price increases roughly proportional to linear footage and diameter: 6″–8″ runs cost about $3-$7/ft supply-only, 10″–14″ about $6-$12/ft supply-only. Doubling diameter can raise material cost by 50%-100% and increase labor by 10%-30% due to handling difficulty.
Insulation grade matters: R4 vs R6 adds about $0.50-$2 per ft; exterior-rated or high-temperature liners add more. Thresholds: under 25 ft runs usually quoted as per-run minimum; over 100 ft can qualify for bulk discounts.
Practical Ways To Reduce AC Flex Duct Price On A Replacement Job
Control scope by replacing only damaged runs, choosing standard foil-faced insulation instead of premium liners, and scheduling off-peak season work. Preparing attic access and pre-measuring runs can cut labor hours and reduce total cost by 10%-30%.
Get at least three quotes, request itemized bids, and compare per-linear-ft pricing and included fittings to avoid hidden add-ons.
How Prices Vary Across U.S. Regions And Typical Percentage Deltas
Expect regional variation of roughly: Midwest baseline, +10%-25% in the South and Sun Belt, +15%-35% in West Coast metro areas, and +20%-40% in Northeast metros. Labor and permit costs explain most of these deltas; material freight contributes for larger ducts and insulation.
Example: $12/ft installed average Midwest → $14-$16/ft Sun Belt → $18-$22/ft West Coast.
Installation Time, Crew Size, And Hourly Rates To Budget For
Small single-run installs: 0.5–3 hours with one technician; whole-house swaps: 8–24 hours with a 2-person crew. Budget $75-$125 per hour per technician; expect $150-$300 per hour total for a two-tech crew.
Assumptions: normal attic/crawlspace access, no HVAC balancing or major sheet metal work required.
Common Add-Ons, Removal Fees, And Site Complications That Increase Price
| Item | Low | Average | High |
|---|---|---|---|
| Old duct removal & disposal | $50 | $150 | $500 |
| Access panels / attic rerouting | $75 | $200 | $700 |
| Sound attenuators or high-MERV lining | $50 | $200 | $600 |
| Emergency or same-day rush | +25% | +50% | +100% |
Unseen obstacles—knob-and-tube wiring, blocked joists, or limited attic clearance—are common reasons quotes jump by 20%-60%.
Three Real-World Quote Examples With Specs And Totals
| Scope | Specs | Labor Hours | Per-ft Rate | Total |
|---|---|---|---|---|
| Single run replacement | 20 ft, 8″ duct, R4 | 1.5 hrs | $12/ft installed | $240-$320 |
| Partial rework (3 runs) | 3 × 25 ft, 6″–8″, R6 | 6 hrs (2 techs) | $10-$14/ft installed | $750-$1,050 |
| Full system rework | 8 runs, mixed diam., attic work | 16-24 hrs (2 techs) | $12-$22/ft installed | $1,200-$2,500 |
These examples show how run count, run length, and access drive final totals; use them to sanity-check contractor bids.