Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterHow Much Does Duct Repair & Sealing Cost in Lewisville?
Our Duct Repair & Sealing services in Lewisville, TX typically cost between $350 and $1,200 for a standard single-family home, with most jobs landing in the $450-$750 range depending on the number of breaches, duct age, and accessibility. Homes built before 2000 in established Lewisville neighborhoods like Castle Hills and Old Town routinely show more deterioration at the duct joints, which adds scope. A written price is delivered before any work begins – no exceptions.
Duct Repair & Sealing Cost Breakdown (2026)
The table below reflects actual price ranges for the Lewisville market. These are not national averages pulled from a content database – they reflect what homeowners in Denton County are paying in 2026 for documented, professional-grade duct work.
| Service | Typical Price Range | Notes |
|---|---|---|
| Aeroseal duct sealing (whole-home) | $1,400 – $2,800 | Pressurized polymer seals leaks from inside the duct run without cutting into walls |
| Mastic sealing (accessible joints, whole-home) | $350 – $650 | Brush-applied sealant at every visible joint and seam; most common on flex-duct systems built 1985-2005 |
| Foil-tape sealing (accessible joints) | $200 – $450 | HVAC-rated foil tape at visible joints; appropriate for minor gaps, not significant breaches |
| Single duct run repair (minor breach) | $95 – $180 | Localized patch or re-wrap at one run; common after pest intrusion or shifting in crawl spaces |
| Single duct run repair (major breach or collapse) | $180 – $380 | Partial replacement of a damaged flex-duct segment; includes reconnection at both ends |
| Plenum seal or repair | $150 – $350 | The plenum is the central distribution box that connects to your air handler; gaps here lose the most conditioned air |
| Full duct system replacement (new ducts) | $2,800 – $6,500+ | When repair is no longer cost-effective; priced per linear foot of new duct plus labor |
| Camera inspection + written scope | $0 (included) | Every CleanRun visit includes a camera inspection; the written price follows before work begins |
What moves the final number
Lewisville homes built in the 1970s and early 1980s – particularly in neighborhoods like Valley Vista and Lakeland – tend to use older rigid metal ductwork that corrodes at the seams. Metal duct joint repairs cost more per linear foot in labor because cleaning and prepping the surface before applying mastic takes time. Flex-duct systems that are more common in homes built after 1990 in areas like Highlands or near Hebron Parkway are faster to seal but more prone to full-segment collapse, especially in attics where summer temperatures above 140 degrees Fahrenheit accelerate deterioration of the outer jacket.
Crawl-space duct systems – found in older sections of Lewisville near the Lake Lewisville shoreline developments – carry a labor premium of roughly 15-25% above attic-mounted systems because of restricted access and the time required to work safely in confined space. Attic work in North Texas summers also carries a heat surcharge from some contractors; CleanRun does not add a seasonal surcharge, but it is worth asking any company you get a quote from whether their summer pricing matches what’s on their website.
What Affects Duct Repair & Sealing Pricing in Lewisville
- Number of breaches and their location: A camera run through the duct system before any work starts – what CleanRun documents as part of the standard photo record – determines exactly how many joints are failing and where. A home with two failing joints at accessible attic elbows is a fundamentally different job from one with eight failing joints distributed across three floors. The camera finding drives the written price, not a rule-of-thumb square footage formula.
- Duct material and age: Flex-duct systems common in Lewisville homes built between 1985 and 2005 degrade faster than galvanized metal and typically need either mastic sealing at every joint or segment replacement. Older rigid metal systems corrode at seams and often need surface preparation before mastic will bond correctly, adding time to the job.
- Accessibility: Attic ductwork in a single-story home with a full attic hatch is the easiest access scenario. Crawl-space systems, second-floor soffits, and any duct run buried in finished wall cavities all add labor time and, in some cases, minor drywall work to reach the breach point. Lewisville’s mix of 1970s ranch-style homes and newer two-story construction in the Old Town area means access conditions vary significantly from street to street.
- Leakage rate at time of inspection: Some contractors use a duct blower test (also called a duct blaster or pressurization test) to measure the total air leakage rate before and after sealing. If leakage is above 15% of total system airflow, aeroseal or comprehensive mastic sealing is usually the more cost-effective path versus patching individual joints. That measurement matters because it drives the scope decision, and scope drives price.
- Sealing method chosen: Aeroseal is the most thorough method for systems with widespread micro-leaks and gaps in inaccessible runs, but it costs more upfront. Mastic applied manually at accessible joints costs less and is appropriate when most leaks are reachable. Foil tape is the lowest-cost option but it is only appropriate for minor gaps on accessible runs – it is not a substitute for mastic on a system with significant leakage.
- Whether duct cleaning is done at the same time: Sealing a dirty duct system locks contaminants in place. Combining Duct Repair & Sealing in Lewisville with a full cleaning in one visit saves mobilization cost and avoids having to schedule two separate appointments. CleanRun prices combined jobs as one written scope, not two separate invoices added together.
BeforeAfterHow to Save on Duct Repair & Sealing
Get a camera inspection before agreeing to any scope
The single most effective way to avoid overpaying is to know exactly what you are paying for before the work starts. A camera run through each duct run – what the industry calls a video inspection of the duct interior – gives you a factual record of where the breaches are, how many there are, and how severe. Without that record, you are buying a service description, not a documented scope. Every CleanRun job includes this inspection, and the photo record from it becomes part of the written deliverable you receive when the crew leaves.
Combine sealing with cleaning in one visit
Scheduling duct cleaning and duct sealing as separate jobs means paying for two mobilizations, two setup times, and sometimes two trips out to Lewisville. When both are done in a single visit, the combined cost is almost always lower than the sum of two individual jobs. It also avoids sealing a system that still has debris in it, which is a real problem if cleaning was skipped.
Ask for a written second opinion on any quote you receive
If you already have a written estimate from another company, CleanRun will put its own number next to it in writing – for free. This is not a sales pitch disguised as a service. It is a direct comparison, in writing, so you can see exactly where the numbers differ and why. Call (940) 240-8552 and mention the competitor’s written estimate.
Ask specifically what sealing method is being used and why
Mastic, foil tape, aeroseal, and full replacement are not interchangeable. Each is appropriate for a different severity of leakage and a different type of duct system. A company that quotes foil tape on a system with 20% air leakage is underselling you a solution that will fail. A company that quotes aeroseal on a system with two minor joint gaps is overselling you a solution you do not need. Ask the technician to explain the method in relation to what the camera found. If they cannot answer that specifically, the written price is not grounded in a real inspection.
Do not delay minor repairs until they become major ones
In Lewisville’s climate, a small breach in a flex-duct run left alone through one North Texas summer does more damage than the repair itself would have cost. Heat and humidity accelerate deterioration of the duct jacket, and a 4-inch gap at a joint can become a 12-inch collapse by fall. A $120 repair in March is often a $340 repair – or a full-segment replacement – by October.
Verify the equipment being used before agreeing to a price
Professional-grade sealing and cleaning requires professional-grade tools. CleanRun uses equipment from Rotobrush, Nikro, Abatement Technologies, Honeywell, Aprilaire, and Guardsman – brands you can look up independently and compare to what any other company is using. If a contractor cannot name the equipment they are bringing to your home, that is relevant information before you sign anything.
FAQs – Duct Repair & Sealing Cost in Lewisville
How much does duct sealing cost in Lewisville, TX?
Duct sealing in Lewisville costs between $350 and $2,800 depending on method and scope. Manual mastic sealing at accessible joints runs $350-$650 for a whole-home treatment. Aeroseal – which pressurizes the duct system and injects a polymer sealant that adheres to leaks from inside, including runs that are otherwise inaccessible – runs $1,400-$2,800 for a whole-home job. Foil-tape sealing of minor accessible gaps costs $200-$450. The right method depends on what a camera inspection actually finds, not on which option costs less. Call (940) 240-8552 for a written price specific to your home’s system – the inspection and written quote are free.
Is it cheaper to repair ducts or replace them?
Repair is cheaper than replacement in most cases, but the break-even point depends on the age and condition of the existing duct system. As a general rule: if more than 30-40% of a flex-duct system is damaged or collapsed, replacement often costs less over a five-year horizon than repeated repairs. A full replacement in Lewisville runs $2,800-$6,500 or more depending on system size and material. A documented camera inspection gives you the factual basis for that decision – you can see the percentage of damaged runs in the photo record rather than taking a contractor’s word for it. Call (940) 240-8552 and we will put a repair scope and a replacement scope side by side in writing so you can compare them directly.
How long does duct sealing take?
A manual mastic sealing job on a standard 2,000-square-foot Lewisville home takes 3-5 hours, including the camera inspection before work starts and the photo documentation after. Aeroseal jobs typically take 4-8 hours because the system has to be pressurized, tested before sealing, injected, cured, and then tested again to confirm the leakage rate dropped. Either way, the written price you receive before work starts includes the time estimate, so there are no surprises at the end of the day.
Can duct sealing lower my energy bills?
Yes, measurably. The U.S. Department of Energy has documented that the average home loses 20-30% of conditioned air through duct leaks before it reaches the registers (the vents in your floors and ceilings). In Lewisville summers, where your HVAC system may run 10-12 hours a day from June through September, that loss is reflected directly on your Oncor/TXU bill. Sealing a system with significant leakage typically reduces HVAC energy consumption by 10-20%. The exact number depends on how leaky the system was before sealing, which is why a pre- and post-sealing leakage test gives you an actual number rather than an estimate. We include that test result in the documented photo record delivered after every job.
Does CleanRun offer a warranty on duct repair and sealing work?
Every job CleanRun completes in Lewisville is backed by the 365-Day Done Right Promise – if the work is not right, we make it right. This is a written guarantee on every job, not a policy that requires manager approval or a call to a corporate hotline. It is documented in writing as part of the job record you receive. If a sealed joint fails within a year of the service date, we come back and fix it. That commitment is the same on a $200 foil-tape job and a $2,000 aeroseal job.
What is the H.A.V.E.N. Standard and why does it matter for pricing?
The H.A.V.E.N. Standard is CleanRun’s documented operating protocol covering how technicians are vetted, how prices are written and delivered, how documentation is handled, and how the 365-Day Done Right Promise is honored. Haven Standard Clause 1 is the upfront pricing requirement: a written price is delivered before any work starts, on every job, without exception. No “call for a quote” and no price revealed for the first time when the crew is already in your attic. This matters for pricing because it means the number you see before work begins is the number on the invoice when work ends.
What the Camera Found: Real Conditions in Lewisville Homes
Before any CleanRun technician quotes a sealing job, a camera goes through every duct run. What follows are conditions the camera actually finds in Lewisville homes – not fabricated scenarios, but documented patterns from over a decade of work in this market.
In Castle Hills, a neighborhood developed primarily in the late 1990s with a mix of flex-duct and rigid-metal systems, we regularly see mastic that was applied during original construction but never properly cured. It looks intact from the outside of the duct but the camera shows it has shrunk away from the joint edge, leaving a gap of 0.5-1.5 inches at every elbow. That is not visible without a camera, and it is not diagnosable by a technician who skips the inspection and quotes a flat rate by square footage.
In Old Town Lewisville, where homes from the 1960s and 1970s still have original galvanized metal ductwork, the camera frequently finds rust perforation at the bottom of horizontal runs – not at the joints, but through the duct wall itself. Standard mastic sealing at joints does not address that. The repair scope is different: partial section replacement followed by mastic at the new connections. The cost is also different, which is exactly why the camera precedes the written price rather than following it.
In newer construction near Lewisville’s FM 407 corridor and the Flower Mound boundary, flex-duct systems installed after 2010 show a different problem: the inner liner has separated from the outer jacket at connections that were stapled rather than clamped during original installation. The separation is not visible from the register end. The camera shows it. The repair is a reconnection and mastic seal at the boot – typically $95-$150 per occurrence.
CleanRun vs. the $79 Coupon: What the Price Actually Includes
Lewisville homeowners searching for duct sealing will find companies advertising entry-level pricing in the $79-$99 range. It is worth understanding what that price typically does and does not include, because the line items matter.
A $79 coupon price almost always covers only the service visit – not a camera inspection, not a written scope, not documentation of what was found or repaired. Some companies count the number of vents in your home and multiply by a per-vent rate that was not disclosed when you called. Others define “sealing” as applying foil tape to accessible joints only, regardless of whether those are the joints that are actually leaking.
CleanRun’s pricing structure includes the camera inspection, the written scope, the photo record before and after, and the 365-Day Done Right Promise as standard line items – not as add-ons. The written price you receive before work starts covers all of that. If you want to compare a CleanRun quote to a competitor’s written estimate, the free second opinion service exists specifically for that purpose. Call (940) 240-8552 and bring both documents.
Key Takeaways
- Duct sealing in Lewisville costs $350-$1,200 for most homes, with Aeroseal whole-home jobs running $1,400-$2,800.
- The right sealing method depends on what a camera inspection finds – not on a per-vent formula or a square footage calculation.
- Lewisville homes built before 2000 (Valley Vista, Old Town, Castle Hills) and those with crawl-space duct runs carry higher repair costs due to duct age and access conditions.
- Combining duct cleaning and sealing in one visit costs less than scheduling them separately and avoids sealing a contaminated system.
- Every CleanRun job includes a camera inspection, a written price before work starts, a documented photo record after, and the 365-Day Done Right Promise – all as standard deliverables, not upsells.
- CleanRun offers a free second opinion on any written estimate from a competitor – in writing, side by side.
Get a Written Price for Your Lewisville Home
If you want to know exactly what duct repair or sealing will cost for your specific home, the only way to get that number is a camera inspection followed by a written scope. CleanRun serves all of Lewisville and the surrounding Denton County area – from Castle Hills and Old Town to the FM 2499 corridor – and every inspection concludes with a written price before any work begins. That is Haven Standard Clause 1, and it has been the same since the first job in 2013.
Tomas Reyes and the CleanRun team have documented duct conditions in more than 52,000 homes. Every one of those jobs started with a camera and ended with a photo record. To schedule your inspection or get a free second opinion on a competitor’s written estimate, call (940) 240-8552. A live person answers every call.
For background on CleanRun’s full approach to duct work in this market, the home page covers the complete service list and the H.A.V.E.N. Standard in detail.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Lewisville, serving Lewisville, TX since 2013.
Pricing reflects the Lewisville market as of 2026. CleanRun Air Duct Cleaning Lewisville offers free estimates – call (940) 240-8552.
What Our Customers Say
"Flat price agreed up front, no per-vent add-ons at the end. That was the whole reason I did not call the coupon company."
- Suzanne B."My allergies genuinely improved. They also told me the ducts did not need sealing, which I had been quoted for elsewhere."
- Petra K."The before and after photographs of each run are the reason I used them. You cannot argue with what came out of the return."
- Marguerite O.