Ductwork Repair and Replacement Cost Guide
In This Guide
Ductwork Replacement Costs in 2026
Full ductwork replacement in a typical single-family home costs $1,400 to $5,600, with the national average landing near $3,000 to $4,000 for a complete system. The per-linear-foot cost runs $25 to $55 depending on whether you are doing a partial replacement or a full tear-out with new insulated ducting. Most homes have 100 to 300 linear feet of ductwork, so total cost scales directly with the size of the system.
Several variables determine where your project falls within that range. Home size is the most obvious factor, since a 1,200-square-foot ranch with a simple layout needs far less ducting than a 3,000-square-foot two-story with multiple zones. The type of duct material you choose matters significantly as well. Galvanized sheet metal runs $10 to $15 per linear foot for material alone and lasts 25 or more years. Flexible duct costs $4 to $8 per foot but has a shorter lifespan of 10 to 15 years. Insulated flex duct, which is the most common choice in new installations, runs $7 to $12 per foot and offers better energy efficiency than uninsulated options.
Labor makes up roughly 50 to 60 percent of the total project cost. HVAC contractors typically charge $75 to $125 per hour for ductwork installation, and a full replacement takes two to five days depending on the complexity of the layout and whether the crew needs to open walls, ceilings, or floors to access old ducts. Accessibility is one of the biggest cost multipliers. Ducts running through an open basement or accessible attic are relatively easy to reach, while ducts buried inside walls or under concrete slabs require demolition work that adds $1,000 to $3,000 or more to the project. For a detailed breakdown by square footage, see our guide to ductwork replacement cost by home size.
Regional pricing differences also affect your bottom line. Labor rates in metropolitan areas like New York, San Francisco, and Chicago run 30 to 50 percent higher than in rural markets. Building permit requirements vary by jurisdiction too, with permits for ductwork projects ranging from $50 to $250 for straightforward replacements and up to $1,500 when the work is part of a full HVAC system install. We break down these geographic price differences in our ductwork replacement cost by region guide.
Ductwork Repair Costs by Type
Not every duct problem requires a full system replacement. Many issues can be fixed with targeted repairs that cost a fraction of a replacement project. The average ductwork repair costs $660, but the range spans from $200 for a simple patch job to $2,100 for extensive repairs across multiple sections of the system.
Duct sealing is the most common and cost-effective repair. Manual sealing with mastic sealant or metal-backed tape costs $400 to $1,900 depending on how many leaks exist and how accessible the ducts are. Professional Aeroseal sealing, which uses an aerosol polymer injected into the duct system to seal leaks from the inside, costs $1,500 to $6,900 but can reach leaks that no technician could access by hand. The Department of Energy estimates that the average home loses 20 to 30 percent of conditioned air through duct leaks, so sealing often pays for itself within two to three years through lower energy bills. Our duct sealing cost and energy savings guide covers both methods in detail.
Rust and corrosion repair costs $200 to $500 per section. This is common in metal ductwork exposed to moisture, particularly in basements, crawl spaces, and attics with poor vapor barriers. If corrosion is widespread across the system, replacement is usually more cost-effective than patching multiple sections.
Disconnected or collapsed sections cost $200 to $600 to repair. Flexible duct is especially prone to disconnecting at joints or collapsing when support straps fail. This type of damage is often invisible because the ducts are hidden behind walls or above ceilings, but it causes noticeable temperature inconsistencies in the affected rooms. For a full breakdown of repair pricing, see our ductwork repair cost guide.
Insulation damage or deterioration costs $200 to $800 to address, depending on how much duct length is affected. When duct insulation compresses, falls off, or gets damaged by water or pests, the exposed duct surface radiates heat in summer and loses it in winter, reducing HVAC efficiency by 10 to 25 percent. Our guide on ductwork insulation cost explains why uninsulated ducts waste so much energy and what proper insulation costs.
What Drives Ductwork Costs
Understanding the factors that influence ductwork pricing helps you evaluate quotes and avoid overpaying. The four biggest cost drivers are material choice, accessibility, system complexity, and labor rates.
Material choice affects both the upfront cost and the long-term value of your ductwork. Sheet metal ducts cost more to install but last 25 or more years with minimal maintenance. Their smooth interior surfaces create less airflow resistance, which means your HVAC system works less to push air through them. Flexible duct is cheaper and faster to install, which is why it dominates new construction, but its ribbed interior creates more friction and its shorter lifespan means you may replace it twice in the time a single metal duct system would last. Most modern installations use a hybrid approach, with sheet metal trunk lines feeding flexible branch runs to individual rooms. Our flexible vs rigid duct comparison covers the performance and cost tradeoffs in detail.
Accessibility is often the factor that surprises homeowners the most. Ducts in an unfinished basement or open attic can be reached, inspected, and replaced without any demolition work. Ducts inside finished walls, above drywall ceilings, or under concrete slabs require cutting open those surfaces, doing the duct work, and then restoring the surfaces afterward. This demolition and restoration work can add $1,000 to $5,000 to a project depending on how much needs to be opened up and what materials are involved in the repair. Our guide to ductwork installation by location breaks down costs for attic, basement, and crawl space installations.
System complexity includes factors like the number of zones, the total linear footage of ductwork, the number of supply and return registers, and whether the layout requires complex routing around structural obstacles. A straightforward ranch-style home with a central mechanical room and short, direct duct runs costs far less per square foot to duct than a multi-story home with long runs, multiple turns, and ducts that need to route around plumbing, electrical, and structural elements.
Labor rates vary significantly by region and season. HVAC contractors in major coastal cities charge $100 to $150 per hour, while contractors in smaller markets may charge $65 to $90. Scheduling work during the shoulder seasons of spring and fall, when HVAC demand drops, can sometimes result in better pricing and faster scheduling. Emergency ductwork repairs, while uncommon, carry premium rates of 1.5 to 2 times the standard hourly rate.
Signs Your Ductwork Needs Replacement
Ductwork deteriorates gradually, which makes it easy to overlook until the problems become severe. Most duct systems last 15 to 25 years, with flexible ducts on the shorter end and well-maintained metal ducts on the longer end. Several warning signs indicate that your ducts are past the point of cost-effective repair.
Uneven temperatures between rooms are one of the earliest indicators of duct problems. If some rooms in your home are consistently too hot or too cold while others are comfortable, the ductwork serving those rooms may be leaking, disconnected, undersized, or crushed. Before assuming the ducts are at fault, rule out simpler causes like dirty filters, blocked registers, or a malfunctioning thermostat. Our guide on how ductwork design affects room temperature explains the relationship between duct layout and comfort.
Rising energy bills without increased usage suggest that your duct system is losing conditioned air. A duct system in good condition delivers 80 to 90 percent of the air your HVAC produces to the living spaces. A deteriorated system might deliver only 60 to 70 percent, forcing your HVAC to run longer cycles to maintain temperature. This shows up as higher utility bills, more frequent HVAC cycling, and increased wear on the heating and cooling equipment. An energy audit can measure exactly how much air your ducts are losing.
Visible damage including dents, holes, rust, disconnected joints, or sagging flexible duct sections is an obvious sign that repairs or replacement are needed. Check any exposed ductwork in your basement, attic, or crawl space annually. Leaking duct indicators are not always visible, though, so a professional pressure test is the definitive way to measure duct integrity.
Excessive dust, musty odors, or poor indoor air quality can indicate that ducts are pulling in unconditioned air from attics, crawl spaces, or wall cavities through leaks and gaps. This unconditioned air brings dust, insulation particles, and sometimes mold spores into your living spaces. If your home gets dusty quickly after cleaning, or if you notice musty smells when the HVAC runs, your ducts may be compromised. For a complete checklist, see signs your ductwork needs replacement.
Age over 15 years is reason enough to have your ducts professionally inspected, even if you are not noticing obvious problems. Flexible duct degrades faster than metal, with joints loosening, insulation compressing, and the inner liner developing cracks over time. Metal ducts are more durable but can develop rust at seams and connections, especially in humid climates. Our guide on how long ductwork lasts covers expected lifespans by material and what maintenance extends their useful life.
Duct Materials: Flexible vs Rigid Metal
Choosing between flexible and rigid metal ductwork involves balancing cost, performance, durability, and installation constraints. Each material has clear strengths and weaknesses that make it better suited to certain situations.
Rigid metal ductwork (galvanized steel or aluminum) costs $10 to $15 per linear foot for materials and $7 to $13 per foot installed. It provides superior airflow because the smooth interior surface creates minimal friction loss. Metal ducts are also more durable, with lifespans of 25 to 30 years, and they resist mold growth, pest damage, and compression. They are easier to clean than flexible duct because their smooth surfaces do not trap debris. The main downsides are higher material and labor costs, longer installation times, and difficulty routing around obstacles in tight spaces.
Flexible ductwork costs $4 to $8 per linear foot for materials and is significantly cheaper to install because it bends around obstacles without requiring custom fittings. This makes it the default choice in new construction where cost and speed are priorities. The ribbed interior surface creates more airflow resistance than smooth metal, though, which can reduce HVAC efficiency by 5 to 15 percent if the runs are long or poorly supported. Flex duct also has a shorter lifespan of 10 to 15 years and is prone to kinking, sagging, and tearing over time.
Most HVAC professionals recommend a hybrid approach that uses sheet metal for the main trunk lines and flexible duct for branch runs to individual rooms. This combination captures the airflow advantages of metal where it matters most, on the high-volume trunk lines, while keeping costs reasonable on the shorter branch connections. For a detailed comparison including performance test data, see our flexible vs rigid duct guide.
Duct Sealing and Energy Savings
Duct sealing is one of the highest-return home improvements you can make. The EPA estimates that the average American home loses 20 to 30 percent of conditioned air through duct leaks, which translates to $200 to $400 in wasted energy costs per year for a typical household. Professional duct sealing costs $400 to $1,900 for manual methods and $1,500 to $6,900 for Aeroseal, which means the investment typically pays for itself in two to five years through energy savings alone.
Manual sealing involves a technician physically applying mastic sealant or metal-backed UL-181 tape to visible joints, seams, and connections. This method works well for ducts that are accessible, but it cannot reach leaks hidden inside walls or other enclosed spaces. Aeroseal takes a different approach by pressurizing the duct system and injecting a polymer aerosol that travels to leak points and seals them from the inside. It can seal leaks as small as 5/8 inch and reaches places no technician can access manually.
Beyond energy savings, properly sealed ducts improve comfort by delivering more conditioned air to the rooms that need it, reduce HVAC wear by shortening run cycles, and improve indoor air quality by preventing unconditioned air from infiltrating the duct system. For a complete cost analysis with expected payback periods, see our duct sealing cost and energy savings guide.
Special Situations and Add-On Costs
Several common scenarios add complexity and cost to ductwork projects beyond the standard replacement or repair estimates.
Adding ductwork to a house that has none is one of the most expensive ductwork projects, running $2,400 to $6,600 for the ductwork alone and $9,000 to $21,000 when combined with a new HVAC system. Homes without existing ducts, such as those heated with radiators, baseboard heaters, or wall units, require routing ducts through finished spaces that were never designed for them. This often means building soffits, giving up closet space, or running ducts through the attic or crawl space. In many cases, a ductless mini-split system is a more practical and cost-effective alternative. Our adding ductwork to an existing house guide covers the full scope of this type of project.
Running ductwork to a new room or addition costs $1,000 to $4,000 depending on the distance from the main trunk line, the route the duct needs to take, and whether the existing HVAC system has the capacity to handle the additional load. Extending ducts without verifying system capacity can cause the entire system to underperform. See our cost to add ductwork for a new room guide for details.
Asbestos in older ductwork is a concern in homes built before the mid-1980s. Asbestos was commonly used in duct insulation, joint compound, and sealing tape during that era. If your home was built before 1985 and you are planning any ductwork project, testing for asbestos before work begins is essential. Testing costs $200 to $800, and professional asbestos abatement adds $1,500 to $5,000 or more to the project depending on the amount of material involved. Our asbestos in ductwork guide covers testing procedures, removal costs, and legal requirements.
Ductwork modifications for HVAC upgrades are often overlooked when homeowners replace their furnace or air conditioner. A larger HVAC system pushing more air through undersized ducts creates noise, pressure imbalances, and reduced efficiency. Conversely, downsizing to a more efficient system may require dampers or zone controls to balance airflow through ducts that are now oversized. Our guide on ductwork modifications for HVAC upgrades explains when and why duct changes are necessary alongside equipment replacement.
When to Repair vs Replace
The decision to repair or replace depends on the age of the ductwork, the extent of the damage, and the cost comparison between a series of repairs and a one-time replacement.
Repair makes sense when the damage is isolated to one or a few sections, the ductwork is less than 15 years old, and the rest of the system is in good condition. Sealing a few leaking joints or replacing a single damaged section costs $200 to $600 and can restore performance without the expense and disruption of a full replacement.
Replacement is the better investment when the ductwork is over 20 years old, when leaks and damage are widespread across the system, when the ducts are undersized for the HVAC equipment they serve, or when the system uses materials that are no longer considered safe, like asbestos-containing insulation. A full replacement costs more upfront but eliminates the cycle of recurring repairs and delivers better energy efficiency, comfort, and air quality for the next 20 to 25 years.
A professional duct pressure test, which costs $150 to $500 as part of a comprehensive inspection, gives you the objective data you need to make this decision. The test measures total duct leakage as a percentage of airflow, and results above 15 to 20 percent typically indicate that the system has deteriorated past the point where spot repairs are cost-effective.