How much does air duct sealing cost?
How much does air duct sealing cost?
$1 – $2 average cost per square foot
$1,000 – $6,000 average total cost
Average air duct sealing cost
Air duct sealing costs $1 to $2 per square foot or $1,000 to $6,000 total, depending on the house size, sealing method, duct accessibility, and local labor rates. Many technicians use Aeroseal, a brand-specific aerosol method, that seals small cracks and gaps instead of manually sealing.
| Home size (square feet) | Average total cost |
|---|---|
| 1,000 | $1,000 – $2,000 |
| 1,500 | $1,500 – $3,000 |
| 2,000 | $2,000 – $4,000 |
| 2,500 | $2,500 – $5,000 |
| 3,000 | $3,000 – $6,000 |
Aeroseal duct sealing cost
Duct sealing with the Aeroseal brand costs $1,500 to $6,900 on average. This aerosol method uses a patented system that injects sealant particles into the ductwork, sticking to leaks and small gaps from inside the ducts. This approach is less invasive, quicker, and great for hard-to-reach leaks.
However, it's only used on small- to medium-sized gaps throughout a system. If your ducts are disconnected, blocked, or have gaps larger than 5/8", you'll need a manual sealing instead.
Duct sealing cost factors
Several factors affect the cost to seal air ducts:
Home size
Larger homes have more ductwork, naturally increasing the sealing cost. Every extra square foot can add expense, especially if there are duct leaks in hard-to-reach areas.
Sealing method
Manual sealing involves physically applying metal tape or mastic. This method is best for fixing large holes, but it can be messy, especially if your ducts are behind walls. Aerosol methods involve spraying a sealant inside the ducts and are ideal for minor leaks.
Duct accessibility and layout
Labor rates may rise if ducts are tucked behind walls, under floors, or in cramped attics. A simple system may cost far less to seal than one with complex twists and turns.
Condition and extent of damage
If your ducts need repairs because of larger gaps or damaged sections, the cost rises. Other HVAC repairs may cost $75 to $150 per hour to fix. Small repairs involving fuses or breakers cost less, while fixing a refrigerant leak or evaporator coil costs much more.
If the damage is extensive, your technician may recommend a full or partial replacement. Ductwork replacement costs $25 to $55 per linear foot or $1,400 to $5,600 total on average.
Inspection and testing
An air duct inspection costs $150 to $500, including the furnace and AC unit as well. Inspections check the safety of the entire HVAC system to make sure everything is working properly and helps detect other issues.
Many technicians perform a pressure test instead for $200 to $450. This test checks for leaks by pressurizing the ducts with nitrogen and monitoring for any drops in pressure.
Local incentives and rebates
Some states and utilities offer rebates or tax credits for duct sealing. Check the Database of State Incentives for Renewables and Efficiency (DSIRE) for possible savings.
To increase energy efficiency, make sure your ducts are properly insulated. Exposed ducts can release or absorb heat, making your HVAC system work harder and wasting energy. Duct insulation costs $1 to $13 per square foot on average.
Duct sealing FAQs
What is duct sealing?
Duct sealing means finding and closing leaks or gaps in an HVAC duct system to reduce air loss. Done professionally, this process restores optimal air flow and energy efficiency, improving comfort and lowering utility bills.
Is duct seal waterproof?
The sealants used to close ducts are moisture-resistant, effectively preventing air and most water infiltration, but they are not intended for submersion or direct water exposure over long periods.
What is Aeroseal duct sealing?
Aeroseal duct sealing refers to a process that sprays an aerosol sealant into ductwork. The sealant finds and seals leaks from the inside out, especially effective for minor and hidden leaks that are tough to reach by hand.
Is duct sealing worth it?
Sealing ducts can make a noticeable difference in home comfort and energy savings, with many homeowners reclaiming the cost through lower HVAC bills and less wear on their system. It's valuable for older systems or when persistent comfort or efficiency issues exist.
Getting estimates for duct sealing service
Follow these tips to help you find a reputable duct sealing service near you:
Get at least three itemized quotes.
Request project references and reviews.
Check reviews on HomeGuide and Google.
Confirm if inspections and pressure tests are included.
Check for rebates or incentives in your area.
Questions to ask technicians
Before hiring a duct sealing service, be prepared with questions that ensure clarity about the process, methods, and long-term results.
What sealing methods do you use, and why?
How will you determine where the leak is and how big it is?
Will the quote include inspection and pressure testing?
What warranty do you provide on the sealant and workmanship?
Can you provide references from recent projects?
Are there any rebates or incentives I qualify for?
Using our proprietary cost database, in-depth research, and collaboration with industry experts, we deliver accurate, up-to-date pricing and insights you can trust, every time.