Typical buyers pay $1,200-$5,500 to install a new HVAC duct system; the Cost Of Metal Duct vs Flex Duct depends on material, length, and labor. Metal (sheet metal) systems cost more in materials and fabrication but last longer; flex duct is cheaper per linear foot and quicker to install but has higher long-term losses.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Whole-Home Metal Duct (10-12 vents) | $2,000 | $3,800 | $6,500 | Assumptions: 1,200-2,000 sq ft home, standard 6″–10″ trunk and branch. |
| Whole-Home Flex Duct (10-12 vents) | $1,200 | $2,200 | $3,800 | Assumptions: insulated flex, typical runs, good access. |
| Per Linear Foot Metal Duct (round) | $8 | $15 | $35 | Assumptions: includes fittings; larger gauges cost more. |
| Per Linear Foot Flex Duct (insulated) | $1.50 | $4 | $8 | Assumptions: includes collars and basic clamps. |
Typical Installed Price For Metal Duct Systems In a 1,500 sq ft Home
Metal duct systems for an average 1,500 sq ft single-story with attic access typically run $2,500-$5,000 complete, including boots and basic register grilles. Expect $15-$25 per linear foot for fabricated sheet-metal trunk and branch runs in normal-access attics.
Assumptions: Midwest labor rates, standard 26–28 gauge galvanized steel, 10–12 supply/return outlets.
Typical Installed Price For Flex Duct Systems In the Same 1,500 sq ft Home
Flex duct installs for the same home generally cost $1,200-$2,800 with insulated 6″–10″ flex runs and standard collar connections. Budget $3-$6 per linear foot installed for common insulated flex duct, excluding major balancing work.
Assumptions: insulated flex (R4), average run lengths, contractors using quick-connect fittings.
Breakdown Of Major Quote Components: Materials, Labor, Equipment, Permits
The major parts of a duct quote show why total pricing varies between metal and flex systems.
| Materials | Labor | Equipment | Permits |
|---|---|---|---|
| $800-$3,000 metal sheet, fittings | $600-$2,200 installation labor | $50-$300 scaffolding/duct lifters | $0-$300 local permit fee |
| $200-$900 insulated flex, collars | $400-$1,200 quicker install labor | $0-$150 basic ladders/tools | $0-$200 possible permit |
How Run Length, Number of Bends, and Duct Diameter Change the Final Quote
Long runs, many bends, and larger diameters increase cost significantly; a single 50-foot run adds $150-$500 in material and labor for metal but only $75-$250 for flex. Expect per-bend labor adders of $15-$60 for metal versus $5-$20 for flex on typical jobs.
Numeric thresholds that alter quotes: runs over 30 linear feet, diameters >12″, and more than 4 90-degree bends per run typically push the install into the high range.
Energy-Related Cost Drivers: Leakage, R-Value, and Airflow Penalties
Metal ducts are cheaper to seal effectively; typical leakage savings translate to $80-$300 per year in energy on a mid-size system versus an unsealed flex system. Estimate 5%-15% efficiency penalty for poorly installed flex compared with 2%-6% for sealed metal.
Higher-efficiency HVAC tuning or additional sealing costs $150-$700 but reduces operating expense; factor this into lifecycle pricing.
Practical Ways To Reduce Total HVAC Duct Replacement Price
Control scope by replacing only main trunks or only supply runs when feasible; partial metal trunk + flex branches often saves $700-$2,000. Prepare access (clear attic, remove insulation) to cut labor time by 10%-30%.
Other measures: get 3 written quotes, schedule in shoulder seasons, accept standard grilles, and reuse existing boots where undamaged to lower cost.
Regional Price Differences And Scheduling Effects On Final Cost
Prices vary by region: coastal and urban markets typically cost 10%-30% more than Midwest/rural areas; example: a $3,800 metal install in Midwest becomes $4,500-$5,000 in large coastal metro areas. Busy season (summer/fall) can add 5%-20% due to contractor demand.
Assumptions: percentage deltas apply to both materials and labor components.
Common Add-Ons, Repair Versus Replace Examples, And Quick Quote Scenarios
Typical add-ons include balancing/dampers ($150-$500), additional sealing ($150-$700), register replacement ($15-$75 each), and removal/disposal ($100-$600). Repairing a short damaged flex run often costs $60-$250 versus $400-$900 to replace a comparable metal elbow section.
| Scenario | Specs | Labor Hours | Total |
|---|---|---|---|
| Partial trunk metal repair | 20 ft trunk, 2 fittings | 4-6 | $650-$1,400 |
| Full flex replacement, whole house | 10–12 runs, insulated | 8-16 | $1,200-$2,800 |
| Hybrid: metal trunk + flex branches | long trunk 30 ft + flex runs | 6-12 | $1,800-$3,200 |