Ductwork Replacement Cost Calculator & 3D HVAC Blueprint
Estimate your exact ductwork replacement cost with our interactive 3D and Manual D CAD ductwork replacement cost calculator. Compare the cost to replace ductwork across sheet metal trunks, insulated flex runs, and fiberglass duct board while calculating CFM airflow, R-value insulation upgrades, and total air duct installation cost.
Home Size, Duct Specs & Access
Itemized Ductwork Installation Cost & Manual D Schedule
Breakdown of the Cost to Replace Ductwork by Home Size & Material
Understanding the true cost of replacing ductwork requires looking at three core variables: total linear footage of trunk and branch runs, duct material selection, and workspace accessibility. While basic flexible polyester runs in an open basement keep your initial air duct installation cost low, upgrading to a rigid 26-gauge galvanized sheet metal trunk paired with R-8 insulated branches delivers superior static pressure, quiet airflow, and a 30-to-50-year service life. Use the benchmark table below alongside our ductwork replacement cost calculator to compare typical residential configurations.
| Home Size (Sq Ft) | Typical Duct Footage | Supply & Return Vents | Flex Duct Replacement Cost | Hybrid Metal Trunk + Flex | All-Rigid Sheet Metal Cost |
|---|---|---|---|---|---|
| 1,000 – 1,500 sq ft | 90 – 125 lin ft | 7 – 10 runs | $2,800 – $4,600 | $3,800 – $5,900 | $4,900 – $7,400 |
| 1,500 – 2,000 sq ft | 125 – 165 lin ft | 10 – 13 runs | $3,900 – $6,200 | $5,200 – $7,900 | $6,600 – $9,800 |
| 2,000 – 2,500 sq ft | 165 – 210 lin ft | 13 – 16 runs | $5,100 – $7,800 | $6,800 – $10,200 | $8,500 – $12,600 |
| 2,500 – 3,500 sq ft | 210 – 290 lin ft | 16 – 22 runs | $6,800 – $10,800 | $8,900 – $13,800 | $11,200 – $17,400 |
| 3,500 – 5,000 sq ft | 290 – 420 lin ft | 22 – 28+ runs | $9,500 – $15,200 | $12,400 – $19,500 | $15,800 – $24,500 |
1. Bundling Ductwork With Full HVAC Replacement
Replacing leaky ducts at the same time as your heating and cooling equipment saves 15% to 25% on overlapping plenum and sheet metal labor. Estimate your combined system budget with our furnace and AC replacement cost calculator.
2. Pairing New Ducts With High-Efficiency Equipment
Properly sized Manual D ductwork protects variable-speed ECM blower motors from premature failure. Explore how lifetime heat exchanger warranties perform under proper static pressure in our Amana HVAC reviews.
3. Comparing Value vs. Premium Inverter Systems
Debating whether to invest more of your budget into rigid sheet metal ductwork or a modulating inverter heat pump? Compare equipment tiers and airflow requirements in our breakdown of Goodman vs. Daikin.
4. Protecting Your Investment From Unreliable Units
Even a flawlessly balanced, mastic-sealed trunk and branch system cannot compensate for defective coils or high compressor failure rates. Before signing a contractor quote, check our field report on the worst HVAC brands to avoid.
Frequently Asked Questions About Ductwork Replacement Cost
How much does it cost to replace all ductwork in a house? +
What is the 2 foot rule for ducts? +
- 24-Inch Trunk End-Cap Buffer: The last branch takeoff collar on an extended plenum supply trunk must be installed at least 24 inches (2 feet) back from the capped end of the trunk. When high-velocity air hits the dead-end cap, it creates a static pressure cushion that forces air evenly into the final branch runs rather than starving or over-pressurizing them.
- 24-Inch Takeoff & Fitting Spacing: Branch takeoffs, elbows, and trunk transitions should be spaced at least 24 inches apart (and staggered on opposite sides of the trunk) to prevent air turbulence and static pressure drops.
Is replacing ductwork worth it? +
How to estimate ductwork cost? +
- Calculate Linear Footage & Vents: Multiply your home’s conditioned square footage by
0.08to estimate total linear feet of trunk and branch ducting (e.g., 2,000 sq ft × 0.08 = 160 linear feet), or count each supply and return register (typically $450 to $750 per run installed). - Multiply by Material & R-Value Rate: Multiply total linear footage by your material base rate ($31/ft average for flex, $42/ft for hybrid, or $51/ft for rigid sheet metal) and add 12% for R-6 or 24% for R-8 insulation.
- Apply Access Labor Multipliers: Multiply labor by
1.0×for an open basement,1.18×for an attic,1.32×for a tight crawlspace, or1.48×if opening drywall soffits. - Add Plenums, Demolition & Sealing: Add $4.50/ft for old duct removal, $850 for new sheet metal supply/return plenums, and $650 to $950 for mastic sealing and static pressure balancing.