Ductwork Cost in 2026: Repair and Installation

Last updated: March 2026

By the HVAC Pricing Guide Team

Ductwork is the hidden infrastructure of your HVAC system. It carries heated and cooled air from your furnace, air conditioner, or heat pump to every room in your home, and it returns spent air back to the system. When ductwork is in good condition, you barely notice it. When it is leaking, damaged, or poorly designed, the problems show up as uneven temperatures, high energy bills, and poor indoor air quality.

Ductwork costs range from as little as $200 for a minor repair to $6,000 or more for a complete installation in a new or existing home. This guide covers the full spectrum of ductwork projects, from sealing and cleaning to full replacement, so homeowners can understand what to expect before requesting quotes.

Duct Repair Cost: $200 to $1,000

Most ductwork repairs fall in the $200 to $1,000 range, depending on the scope of the problem and how accessible the damaged section is. Simple fixes like reconnecting a disconnected joint or patching a small hole are at the lower end. More extensive repairs involving multiple sections or hard-to-reach locations push toward the higher end.

The biggest factor in repair cost is accessibility. Ducts that run through open basements or exposed attics are easy to reach and less expensive to repair. Ducts hidden behind finished walls, above ceilings, or under concrete slabs require more time, specialized tools, and sometimes drywall removal, all of which add to the labor cost.

For a minor repair, the job may take 1 to 2 hours. A more complex repair involving multiple sections or difficult access could take half a day. HVAC technician hourly rates typically run $75 to $150, so labor is a significant component of the total cost for any ductwork project.

When to Repair vs. Replace

If the damage is limited to one or two sections and the rest of the ductwork is in good condition, repair is usually the right choice. However, if your ducts are more than 20 years old and you are experiencing widespread issues (leaking joints, sagging flex duct, poor airflow in multiple rooms), a full replacement may be more cost-effective in the long run.

A good rule of thumb: if repair costs would exceed 30% to 40% of the cost of new ductwork, replacement is worth serious consideration. Your HVAC contractor can perform a duct leakage test to quantify how much air your system is losing, which helps inform the repair-vs-replace decision.

Duct Sealing Cost: $300 to $1,000

Duct sealing addresses air leaks at joints, connections, and small gaps throughout the duct system. The average home loses 20% to 30% of conditioned air through duct leaks, according to Energy Star. Sealing these leaks is one of the most cost-effective home energy upgrades available.

Manual duct sealing involves applying mastic sealant (a thick paste) and metal-backed tape to every accessible joint and connection. This is the most common approach and works well when most of your ducts are accessible. A professional will work through the attic, basement, or crawl space to seal each joint individually.

Aeroseal is a newer technology that seals ducts from the inside. The technician temporarily blocks all vents, then pressurizes the duct system with a mist of adhesive particles. The particles collect at leak points and form a seal. Aeroseal can reduce duct leakage by up to 90% and is the only practical option for sealing ducts hidden inside walls and floors.

After sealing, homeowners typically notice more even temperatures throughout the home and a measurable reduction in energy bills. Many utility companies offer rebates for duct sealing, which can offset 25% to 50% of the cost. Check with your local utility before scheduling the work.

Duct Cleaning Cost: $300 to $500

Professional duct cleaning costs $300 to $500 for an average-sized home with one HVAC system. Larger homes, homes with multiple systems, or those with significant contamination can pay $500 to $1,000. The price typically includes cleaning all supply and return ducts, registers, and the main trunk lines. For a full breakdown of what duct cleaning involves and when it is worth the investment, see our air duct cleaning cost guide.

What Duct Cleaning Includes

A legitimate duct cleaning service uses specialized equipment to dislodge and remove dust, debris, and contaminants from inside the duct system. The process typically involves these steps.

• Inspecting the duct system with a camera to assess the level of contamination
• Attaching a high-powered vacuum to the duct system to create negative pressure
• Using brushes, air whips, or compressed air tools to dislodge debris from duct walls
• Cleaning all supply and return registers
• Cleaning the blower compartment and evaporator coil housing (if included)
• Applying an antimicrobial treatment (optional, usually an additional $100 to $200)

The entire process takes 3 to 5 hours for a typical home. Technicians should use HEPA-filtered vacuum equipment to prevent contaminants from being released into the home during cleaning.

When Duct Cleaning Is Needed

Duct cleaning is not needed as frequently as some companies suggest. The National Air Duct Cleaners Association (NADCA) recommends cleaning every 3 to 5 years under normal conditions. However, certain situations call for more immediate cleaning.

• After a home renovation, especially drywall work, sanding, or painting
• After moving into a previously occupied home
• If there is visible mold growth inside the ducts
• If you notice a musty or unpleasant odor from the vents
• After a pest infestation (rodents, insects) in the duct system
• If a household member has unexplained respiratory symptoms or allergies

Does Duct Cleaning Improve Air Quality?

The EPA states that duct cleaning has not been proven to prevent health problems, and studies have not conclusively demonstrated that particle levels in homes increase because of dirty ducts. However, if your ducts have visible mold, evidence of pest activity, or excessive dust buildup, cleaning is a reasonable step.

For homeowners primarily concerned with indoor air quality, upgrading your HVAC filter to a higher MERV rating and maintaining a regular HVAC maintenance schedule will have a more consistent and measurable impact than duct cleaning alone.

New Ductwork Installation: $2,000 to $6,000

Installing new ductwork costs $2,000 to $6,000 for a complete system in an average single-family home. The price varies significantly based on home size, duct material, number of runs, and the complexity of the installation.

New construction installations are less expensive than retrofits because the walls, floors, and ceilings are open, giving the installer easy access. Retrofitting ductwork into a finished home requires cutting into walls or running ducts through attics and crawl spaces, which adds labor time and complexity.

Ductwork Cost Per Linear Foot

HVAC contractors often price ductwork by the linear foot. For planning purposes, here is what to expect for different duct types.

A typical 2,000-square-foot home requires 150 to 300 linear feet of ductwork, including trunk lines, branch runs, and return ducts. The exact amount depends on the home's layout, the number of floors, and the HVAC system design.

Ductwork Design Matters

Proper duct design is just as important as the installation itself. A well-designed duct system delivers the right amount of air to each room, maintains balanced pressure, and minimizes energy loss. Poor duct design leads to hot and cold spots, noisy operation, and wasted energy.

Insist that your contractor perform a Manual D duct design calculation (or equivalent) as part of a new installation or full replacement. This calculation determines the correct duct sizes, layout, and airflow for your home. Simply replicating the existing ductwork layout during a replacement may perpetuate design flaws from the original installation.

A properly designed duct system should have gentle turns rather than sharp angles, minimal use of flex duct, and adequate return air capacity. The return air system is frequently undersized in older homes, which leads to pressure imbalances, door suction, and reduced system efficiency. Upgrading the return air ducts during a replacement project can improve comfort significantly.

Duct Insulation Cost: $1,000 to $3,000

Insulating ductwork costs $1,000 to $3,000 for a whole-home project. The exact cost depends on the amount of ductwork, the insulation material, and the R-value (insulation rating) required. Duct insulation is most important for ducts that run through unconditioned spaces like attics, garages, and crawl spaces.

Uninsulated ducts in an attic during summer can lose 10% to 30% of the cooled air before it reaches your rooms. In a home spending $200 per month on cooling, that is $20 to $60 per month in wasted energy. Duct insulation typically pays for itself in 2 to 5 years through reduced energy bills.

Most building codes require a minimum of R-6 insulation on ducts in unconditioned spaces, and R-8 is recommended for attics in hot climates. If your home was built before these codes were adopted, your ducts may have little or no insulation. A professional energy audit can identify uninsulated ducts and quantify the potential savings from adding insulation.

When insulating ducts, it is important to seal them first. Insulating leaky ducts just means the conditioned air escapes into the insulation rather than into the room. Seal all joints and connections before wrapping or spraying insulation over the ductwork.

Signs of Ductwork Problems

Ductwork problems often develop gradually, making them easy to overlook. Homeowners who recognize these warning signs early can address issues before they lead to costly repairs or significant energy waste.

Uneven Temperatures Between Rooms

If some rooms in your home are consistently warmer or cooler than others, ductwork problems are a likely cause. A disconnected duct run, a crushed flex duct, or a leak at a major junction can starve certain rooms of conditioned air. Temperature differences of more than 3 to 5 degrees between rooms on the same thermostat zone suggest a duct issue.

Before assuming the worst, check that all supply registers are open and unobstructed. Closed registers and furniture blocking vents are common causes of uneven temperatures that do not require ductwork repairs.

High or Rising Energy Bills

Leaky ductwork forces your HVAC system to work harder to maintain the set temperature, which increases energy consumption. If your energy bills have been creeping up over time without a corresponding change in rates or usage habits, duct leaks are a strong possibility. The average home loses 20% to 30% of conditioned air to duct leaks, so the financial impact can be substantial.

Excessive Dust in the Home

Leaky return ducts can pull dust, insulation fibers, and other contaminants from attics, crawl spaces, and wall cavities into the air stream. If you find yourself dusting more often than usual or if you notice dust accumulating quickly on furniture after cleaning, leaky ductwork may be bringing in particulates from unconditioned spaces.

Musty or Unusual Odors

Musty smells from your vents often indicate moisture or mold inside the duct system. This can happen when condensation forms on uninsulated ducts, when a condensate drain backs up into the duct system, or when ducts run through damp crawl spaces. Mold in ductwork is a health concern and should be addressed promptly by a professional.

Visible Damage or Noise

Inspect any visible ductwork in your attic, basement, or crawl space during routine home maintenance. Look for disconnected joints, sagging flex duct, crushed sections, rust, or visible holes. Rattling, whistling, or popping sounds from the duct system during operation also indicate problems. Whistling often points to air leaks or undersized ducts, while rattling may indicate loose connections.

Hot or Cold Spots in the Ductwork

If you can access your ductwork, run the system and feel along the joints and connections. Noticeable temperature changes or air blowing from joints indicate leaks. You can also hold a piece of tissue near duct connections. If it flutters or is pulled toward the joint, there is a leak that needs sealing. For a complete assessment, consider a professional HVAC maintenance visit that includes a duct inspection.

Duct Materials Compared

The choice of duct material affects cost, durability, airflow efficiency, and maintenance requirements. Each material has advantages and drawbacks depending on the application.

Sheet Metal (Galvanized Steel)

Sheet metal is the gold standard for ductwork. It is durable, resistant to mold, easy to clean, and provides smooth interior surfaces that promote good airflow. Sheet metal ducts last 20 to 25 years or more with minimal maintenance. The main drawback is cost: sheet metal is the most expensive duct material, both for the material itself and the installation labor.

Sheet metal ducts can be round or rectangular. Round ducts are more efficient from an airflow perspective, while rectangular ducts are easier to fit into tight spaces like joist bays and soffits. Most residential installations use a combination of both.

Flexible Duct (Flex)

Flexible duct consists of a wire coil covered with a plastic inner liner and surrounded by insulation and an outer vapor barrier. Flex duct is significantly less expensive than sheet metal and much easier to install, which makes it popular with builders and contractors.

The trade-off is that flex duct is more prone to airflow restrictions. If it is not properly supported and stretched taut, it sags and creates resistance that reduces airflow and system efficiency. Flex duct also has a shorter lifespan (10 to 15 years) and is more vulnerable to damage from pests, foot traffic, or accidental compression. For best results, limit flex duct runs to 25 feet or less and ensure proper support every 4 to 5 feet.

Fiberboard

Fiberboard ducts are made from compressed fiberglass with a foil facing. They offer built-in insulation and sound dampening, which can be advantages in certain applications. However, fiberboard has a rough interior surface that can trap dust and promote microbial growth, especially in humid climates.

Fiberboard is rarely used in new residential construction today. If your home has fiberboard ducts and they are in good condition, they can continue to function well. If they show signs of moisture damage, mold, or deterioration, replacement with sheet metal or flex duct is recommended.

Material Comparison Summary

Ductless vs. Ducted Systems

Homeowners facing a major ductwork project sometimes wonder whether a ductless system would be a better investment. Ductless mini-split systems eliminate the need for ductwork entirely by using individual air handlers mounted in each room, connected to an outdoor compressor via refrigerant lines.

When Ductless Makes Sense

Ductless systems are the best option in several specific scenarios. Homes without existing ductwork, such as older homes with radiator heating or baseboard electric heat, are prime candidates. The cost of installing new ductwork ($2,000 to $6,000) plus a traditional HVAC system can exceed the cost of a ductless solution.

Room additions, converted garages, finished attics, and accessory dwelling units (ADUs) are also well-suited for ductless systems. Extending existing ductwork to these spaces is often impractical or prohibitively expensive, especially if the current duct system is already at capacity.

Ductless systems also excel at zone control. Each indoor unit operates independently, allowing different temperatures in different rooms. This eliminates the energy waste of heating or cooling unoccupied rooms, which is a common inefficiency with ducted systems.

When Ducted Is the Better Choice

If your home already has ductwork in good condition, a traditional ducted system is usually more cost-effective. Replacing the HVAC equipment while keeping existing ducts costs less than installing a whole-house ductless system. Ducted systems also distribute air more evenly and quietly throughout the home.

For larger homes requiring heating and cooling in 5 or more zones, a ducted system is typically more practical. A ductless system covering 5 zones requires 5 indoor units, which adds significant equipment and installation costs. Multi-zone ductless systems range from $5,000 to $10,000 or more for a whole-home setup.

Cost Comparison

For homeowners weighing these options, the deciding factors are usually whether ductwork already exists, the home's layout, the number of zones needed, and the total budget. A qualified HVAC contractor can assess both options and provide quotes for each, allowing a side-by-side comparison for your specific home. See our heat pump cost guide for more on ductless and ducted heat pump options.

How to Save Money on Ductwork Projects

Ductwork projects are not cheap, but there are practical ways to reduce costs without sacrificing quality.

Get multiple quotes from licensed HVAC contractors. Ductwork pricing varies significantly between companies, and getting 3 or more written quotes ensures you are paying a competitive rate. Make sure each quote specifies the duct material, insulation level, and scope of work so you are comparing equivalent services.

Schedule the work during the off-season. Spring and fall are peak seasons for HVAC contractors, but winter and mid-summer are often slower periods. Some companies offer discounts or more flexible scheduling during these times.

Combine ductwork upgrades with other HVAC work. If you are replacing your furnace or air conditioner, adding duct sealing, insulation, or even a partial duct replacement to the same project can reduce the total cost because the contractor is already on site and the system is already disassembled.

Check for utility rebates and state energy efficiency incentives. Many utility companies offer rebates for duct sealing and insulation projects, especially when paired with a home energy audit. These rebates can cover 25% to 50% of the project cost in some areas.

Frequently Asked Questions