Air duct replacement typically costs $16–$19 per linear foot, with an average 200-foot replacement costing around $3,100–$3,700 total. Air ducts are a key part of your heating, ventilation, and air conditioning (HVAC) system, distributing heated and cooled air throughout your home.
The cost of replacing ductwork depends on your home’s size, duct layout, material choices, insulation requirements, and local labor rates. In this guide, we’ll break down air duct replacement costs and what goes into project pricing. We also share insights from energy auditor Paule Scheckel on how duct leakage and insulation can affect the efficiency of your HVAC system.
Key Takeaways
- Air duct replacement typically costs about $16–$19 per linear foot, with a 200-foot replacement costing roughly $3,100–$3,700.
- Your ductwork length, material choice, insulation needs, installation complexity, and local labor rates play the biggest roles in replacement costs.
- Replacing damaged or leaking ductwork can improve airflow, indoor comfort, and HVAC efficiency throughout your home.
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What Is the Cost of Replacing Your Air Ducts?
Contractors usually estimate air duct replacement costs based on the total length of ductwork that needs replacing. Most homeowners can expect to pay about $16–$19 per linear foot, though costs may increase for hard-to-access areas, premium duct materials, insulation requirements, or complex HVAC layouts. Compare replacement costs for common ductwork lengths below.
| Ductwork Length | Estimated Replacement Costs |
|---|---|
| 100 feet | $1,600–$1,900 |
| 200 feet | $3,100–$3,700 |
| 300 feet | $4,700–$5,600 |
| 400 feet | $6,200–$7,500 |
| 500 feet | $7,800–$9,300 |
Note: The cost data featured in this guide was sourced using Homewyse, an online database that offers home improvement project estimates, unless otherwise stated.
What Factors Affect Air Duct Replacement Cost?
The cost of replacing your home’s air ducts depends on a few different factors, including the size of your duct system, materials, labor rates, and local permitting requirements. Larger or more complex duct systems generally cost more to replace because they require additional materials and installation time. Learn more about the biggest cost factors for this project in the sections below.
Duct System Size and Layout
The size and configuration of your duct system are major factors in replacement costs. Larger homes typically require longer duct runs and additional vents, increasing both materials and labor.
Accessibility also affects labor costs. Ductwork located behind walls, above ceilings, or inside crawl spaces generally takes longer to remove and replace than exposed ductwork in basements or utility rooms.
Duct Material
Air ducts are commonly made from sheet metal, fiberboard, or flexible duct materials. Rigid ducts, like sheet metal and fiberboard, are typically more durable but also cost more to install. Flexible ducts are typically less expensive and easier to route through tight spaces, but may not last as long as rigid alternatives. Here’s an overview of material costs, excluding labor and installation, for a typical ductwork replacement.
| Duct Material Type | Estimated Replacement Costs |
|---|---|
| Flexible, non-insulated | $1–$3 per linear foot |
| Flexible, insulated | $2–$4 per linear foot |
| Fiberboard | $4–$7 per linear foot |
| Sheet metal (aluminum or galvanized steel) | $7–$15 per linear foot |
Many HVAC contractors use sheet metal or fiberboard for long, straight duct runs and flexible ductwork for shorter connections or areas that are difficult to access. Because each material offers different benefits in terms of cost, durability, and insulation, many duct systems incorporate a combination of materials.
Duct Insulation
Adding insulation can also increase project costs. Proper ductwork insulation helps reduce energy loss, improve HVAC efficiency, and maintain more consistent indoor temperatures.
Many duct systems have sections that run through unconditioned spaces like attics, crawl spaces, and garages. Flexible and sheet-metal ducts often require additional insulation in unconditioned spaces, whereas fiberboard ducts provide built-in insulation and may not require supplemental insulation.
Pro Tip
- In a This Old House segment about air duct leaks, Paule Scheckel, an energy auditor, says that uninsulated ductwork in unconditioned spaces can lose 10%–15% of heating and cooling energy, making insulation an important consideration during a duct replacement project.
Labor Costs
When replacing your air ducts, labor costs can vary by region because of differences in the cost of living and demand for skilled technicians. Homeowners in large metropolitan areas typically pay more for duct replacement than those in smaller cities or rural communities.
Building Codes, Regulations, and Permitting Fees
Local building codes and permit requirements can also affect project costs. Permit fees often range from less than $100 to several hundred dollars, depending on your location and the scope of the work.
Other Air Duct Replacement Costs To Consider
Since your duct system interacts with your HVAC equipment and other components, an air duct replacement is not an isolated project. Additionally, a duct replacement usually requires the temporary removal of some ceiling and wall sections. Here’s a list of some additional cost factors you can expect during a duct replacement.
An air duct replacement usually involves cutting into your walls and ceiling. As a result, we recommend budgeting for drywall repairs after your new ductwork installation.
Air ducts are bulky and heavy, and removing your existing system can become labor-intensive. HVAC contractors usually charge an additional fee for removing and disposing of old ducts because of the complexity of the process.
If your air conditioner or furnace is near the end of its service life, you might consider upgrading the unit along with your duct system. This can help improve your entire system’s energy efficiency and performance. If both your air conditioning system and furnace need replacing, consider installing a modern heat pump, which achieves the functions of both devices with greater efficiency.
Even if you don’t need an air conditioner or furnace upgrade, your HVAC system may require minor adjustments to integrate with the new ducts. For example, you may need to replace your blower motor or resize your air vents. Your HVAC installer can let you know if this is the case.
If you have mold or asbestos in your existing ductwork, expect increased repair or replacement bills to cover removal of these materials. Asbestos abatement or mold remediation can add upwards of $2,000 to your overall project cost, according to local market prices. Paying for routine duct and vent cleaning can help prevent mold buildup and maintain indoor air quality in your home.
Understanding Common Types of Air Ducts
You can classify air ducts by their material and by their rigidity or flexibility. We put together a list of the three most common types of ducts used in residential HVAC systems below.
- Sheet metal: Sheet metal ducts are typically made from galvanized steel or aluminum. They’re durable, resistant to mold growth, and can withstand decades of use. However, sheet metal is usually the most expensive duct option. You can also have sheet metal ducts insulated or lined with fiberglass when installed in unconditioned spaces.
- Fiberboard: These ducts are made from rigid fiberglass panels. They generally cost less than sheet metal ducts and provide built-in insulation, which can improve energy efficiency. However, they’re typically less durable than metal ductwork.
- Flexible: Flexible ducts are made from a wire coil covered by plastic and, in many cases, insulation. Their flexibility makes them useful for navigating tight spaces and complex layouts where rigid ductwork is difficult to install. Flexible ducts are usually the most affordable option, but may not last as long as rigid duct materials.
When To Repair vs. Replace Ductwork
Homeowners can often resolve ductwork issues with targeted repairs instead of replacing the entire system. However, extensive damage, poor installation, or widespread efficiency problems may make replacement the more cost-effective option in the long run. A qualified HVAC contractor can inspect your ductwork and recommend the best solution based on its condition and performance.
Signs You Should Repair Your Air Ducts
Repairing your air ducts is usually a practical solution if your system is less than 10 years old and has only sustained minor damage, such as:
- Localized air leaks
- Damaged insulation on a small section of ductwork
- Loose connections, supports, or fittings
- Minor dents or physical damage
Signs You Should Replace Your Air Ducts
On the other hand, replacing your air ducts is often required if you notice any of the following:
- Extensive air leaks
- Significant corrosion, deterioration, or physical damage
- Poor airflow or uneven temperatures in multiple rooms
- Improperly designed or installed ductwork
- Major insulation failures affecting large portions of the system
- Aging ductwork that requires frequent repairs or no longer operates efficiently
Pro Tip
- Scheckel says that every joint and seam in a duct system represents a potential air-leak location, which can reduce HVAC efficiency over time.
Can You Replace Your Home’s Air Ducts Yourself?
We recommend hiring a licensed HVAC professional for air duct replacement rather than trying do-it-yourself (DIY) methods. Installing ductwork requires specialized knowledge of airflow design, building codes, insulation requirements, and HVAC system sizing. Improperly installed ducts can reduce system efficiency, increase energy costs, and lead to uneven heating and cooling throughout your home.
Professional contractors can also obtain permits when required, make sure the installation complies with local building codes, and identify underlying HVAC issues that may affect performance. While homeowners can sometimes handle minor duct sealing or insulation repairs, full duct replacement is generally not considered a DIY-friendly project.
Is an Air Duct Replacement Worth It?
An air duct replacement is often worth the investment if your existing ductwork has extensive air leaks, insulation failures, or other issues that reduce HVAC performance. According to Scheckel, duct leakage can account for 20% or more of a home’s heating and cooling energy loss, highlighting the impact damaged ductwork can have on energy efficiency.
While replacement costs can range from less than $2,000 for a small, straightforward project to more than $8,000 for a large or complex system, new ductwork can improve airflow, comfort, and energy efficiency throughout your home.
FAQs About Air Duct Replacement Costs
What is the lifespan of an air duct?
The lifespan of air ducts depends on the material, installation quality, and maintenance. Flexible ductwork typically lasts 10–20 years, fiberboard ducts often last 10–15 years, and sheet metal ducts can last 20 years or more. If you notice persistent air leaks, poor airflow, or rising energy bills, you may need to have your ductwork inspected, regardless of its age.
Does homeowners insurance cover air duct replacement?
This depends on the specific terms of your insurance policy. Generally, homeowners insurance doesn’t cover duct replacement resulting from age or normal wear and tear. However, if your ducts have suffered sudden damage from causes like extreme weather or fire, you may qualify for insurance coverage. To confirm duct coverage, we recommend asking your insurance company.
How long does ductwork replacement take for a house?
The time required to replace ductwork depends on the size and complexity of your system. Replacing a basic duct system with a simple layout can take 1–2 days, based on information we gathered from local installers, while replacing a large and complex system can take four days or more.
How often should homeowners replace their ductwork?
As a rule of thumb in the HVAC industry, air ducts typically need a replacement after 10–15 years. However, low quality flexible ducts may require an earlier replacement. On the other hand, if you invest in sheet metal ducts, you can potentially use your new duct system for 20 years or more. To keep your system running smoothly over time, you can invest in routine HVAC maintenance, which typically costs between $75–$200 for an annual visit.
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