Duct Repair & Sealing Cost - Tested First, Written Price Second

Every visit starts with

Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents

Worth knowing

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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Before & after – our own jobs

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How Much Does Duct Repair & Sealing Cost in Dallas?

Our Duct Repair & Sealing services in Dallas typically cost between $350 and $1,200 for a standard single-story home, with most jobs landing in the $500-$850 range. Larger two-story homes or systems with significant deterioration – crushed flex duct, disconnected plenums, or failed mastic joints – can run $1,200 to $2,800 before any HVAC component work is added. Every CleanRun job starts with a written price before a single panel comes off, so you know the exact number before work begins.

Duct Repair & Sealing Cost Breakdown (2026)

The table below reflects real pricing in the Dallas market as of 2026. These are not national averages pulled from a data aggregate – they reflect what homeowners in Dallas, Frisco, Oak Cliff, and Lake Highlands are actually paying for documented duct work this year.

What Moves the Price Up or Down

The single biggest cost driver in Dallas duct work is attic access and attic conditions. From May through September, attic temperatures in Dallas regularly reach 140-160°F. That heat slows work, limits how long a technician can safely stay in the space, and drives up labor time on attic-run duct systems – which covers the majority of homes built in Dallas between 1970 and 2010. A job that takes two hours in February can take four hours in July, and an honest price reflects that.

The second variable is whether your system uses rigid sheet-metal duct, flexible duct, or a combination. Rigid duct is more expensive to fabricate replacement sections for but holds a mastic seal better over time. Flex duct is faster to replace per run but is more prone to future tearing, especially in tight attic spaces where HVAC crews step on it during other service visits. In Preston Hollow and University Park, we regularly find rigid duct systems from the 1970s and 1980s where the original mastic has dried and cracked at every joint – unsealing quietly for years before a homeowner notices uneven room temperatures or a spike in their Oncor bill.

Third: how much leakage there actually is. A camera inspection is the only way to know before pricing a job. Homes in Lake Highlands and East Dallas built in the late 1980s frequently show 20-35% duct leakage on a blower door test – meaning nearly a third of conditioned air never reaches a living space. That is a full-system repair scope, not a spot-seal job, and the price reflects it.

What Affects Duct Repair & Sealing Pricing in Dallas

• Home size and number of duct runs: A 1,400 sq ft Oak Cliff bungalow might have 8-10 duct runs total. A 3,800 sq ft Frisco two-story can have 22-28 runs. More runs means more joint connections to inspect, seal, and photograph – price scales accordingly. Most Dallas homes in the 2,000-2,500 sq ft range have 14-18 runs.
• Attic vs. crawl space vs. in-wall routing: Dallas is predominantly slab-on-grade, which means most duct systems run through the attic. Attic work carries a heat-season labor premium. The handful of older Dallas homes with crawl space duct systems – found occasionally in parts of Lakewood and Winnetka Heights – are priced differently because access, humidity, and rodent exposure create a different scope.
• Severity and type of damage: A single disconnected flex run found during a camera inspection is a $120-$280 repair. A system where the return plenum has separated from the air handler, three runs are crushed, and every boot is unsealed is a full-scope job. The camera tells the story; the written price follows from what the camera shows, not from an estimate made at the thermostat.
• Age of the duct system: Dallas homes built before 1995 often have duct systems that were never designed to current leakage standards. Fiberglass duct board systems from the 1980s – common in Far North Dallas and Richardson – deteriorate from the inside and frequently show delamination that mastic cannot bridge. Those systems sometimes require section replacement rather than sealing, which changes the scope and price.
• Sealing method selected: Aeroseal (an injected polymer sealant that bonds from inside the duct) costs more upfront than manual mastic application but can reach joint failures that are physically inaccessible – inside wall cavities, above dropped ceilings, in tight plenum chases. For homes where access is limited, Aeroseal’s documented leakage-reduction printout is often the only way to verify the work was done. Manual mastic is appropriate and cost-effective where joints are reachable.
• Permit requirements: In Dallas proper, duct repair that involves replacing more than 50% of a duct system typically requires a mechanical permit through Dallas Development Services. The permit fee runs $75-$200 depending on scope and is passed through at cost. Frisco, Plano, and Garland have similar thresholds but their own permit schedules. Any contractor who does not mention permits on a full-system replacement is worth asking about directly.

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Signs You Actually Need Duct Repair – Not Just Cleaning

Duct cleaning and duct repair are different services that address different problems. Cleaning removes debris, particulates, and microbial buildup from the interior surfaces of the duct runs. Repair addresses structural failures: disconnections, tears, crushed sections, failed joints, and separated plenums. You can clean a leaking duct system all day and the rooms will still be uneven in temperature, because conditioned air is escaping before it reaches the register.

In Dallas homes, the clearest sign of duct leakage is uneven room temperatures that don’t respond to thermostat changes. A bedroom that stays 4-6 degrees warmer than the rest of the house in August, even with the HVAC running hard, usually has a partially disconnected or crushed supply run. A second signal is higher-than-expected Oncor bills – when conditioned air leaks into the attic instead of reaching living spaces, the system runs longer to compensate. A third is visible dust streaks around registers, which indicate air is bypassing a filter and being drawn directly from the attic or wall cavity into the return system.

The CleanRun camera goes into every run before pricing is written. If what we find is a debris and contamination problem, we say so and scope a cleaning. If the camera shows a 4-inch gap at the second elbow or a flex duct that has collapsed to 30% of its rated diameter, we scope a repair. Both findings go into the written report with photographs – the same Duct Repair & Sealing in Dallas documentation standard we have held since 2013.

The Honest Case for Aeroseal vs. Manual Mastic in a Dallas Home

This question comes up on almost every quote for homes built in the 1980s and 1990s in North Dallas, Garland, and Mesquite. Manual mastic sealing is the right answer when the joints are accessible – meaning a technician can physically reach them in the attic or mechanical room with a brush. It is a durable, proven material, and on a system where access is good, it is often the most cost-efficient repair. The mastic cures hard, bonds well to both sheet metal and the exterior of flex duct, and does not depend on a proprietary chemical process.

Aeroseal is the right answer when joints are inside wall chases, above finished ceilings, or in return plenums that cannot be safely disassembled without damaging finished surfaces. The process pressurizes the duct system and injects an atomized polymer sealant; the particles bond at every point where air is escaping. The printed leakage report before and after is the documentation that makes it verifiable. For a 2,200 sq ft home in Lakewood with original ductwork and a finished second floor, an Aeroseal job might cost $1,600-$1,900 and reduce leakage from 28% to under 6% – with a printout showing both numbers. That is a different product from a mastic brush-out, and the pricing reflects it.

We do not recommend one over the other by default. The camera inspection tells us where the failures are; the location of those failures tells us which method is appropriate. Both methods carry the 365-Day Done Right Promise – if the leakage rate climbs back above the post-repair measurement within a year, we come back and make it right. That commitment is in writing on every job record, not just in marketing copy.

How to Save on Duct Repair & Sealing in Dallas

Get the Camera Inspection First

Skipping the inspection to save $95-$195 is the most expensive decision homeowners make in this category. Without a camera diagnostic, a technician is pricing from assumptions – and assumptions either over-scope (you pay for repairs you don’t need) or under-scope (the root problem gets missed and you pay twice). The CleanRun inspection fee is credited toward the repair if work is booked the same day, so in most cases you are paying nothing extra for the diagnostic.

Combine Duct Repair with Duct Cleaning

If your system needs both – and many Dallas homes built before 2000 do – scheduling them together saves a mobilization cost and allows the cleaning to follow the repair, so the inside of the sealed duct runs are photographed in their finished condition. Doing them separately means two truck rolls, two attic entries, and two written reports that should have been one.

Use the Free Second Opinion

If you have a written estimate from another Dallas contractor, CleanRun will put its own written number next to it at no charge. Bring the estimate. We document what is scoped, what our price is, and where any differences come from – in writing, before you decide anything. That offer does not expire and does not require a minimum spend. If a competitor’s number is genuinely lower for the same documented scope, you should know that before spending more.

Address Repairs Before Summer

Dallas HVAC systems work hardest from June through September. A duct system that is leaking 25% of conditioned air into a 150-degree attic during that period costs real money in electricity every month. Scheduling repair in March, April, or early May avoids the summer labor demand curve, allows attic work to be done in more tolerable conditions, and means your system is sealed before the Oncor bills peak. There is no artificial scarcity claim here – this is just the thermal calendar of a North Texas attic.

Ask About the Written Price Before Anything Starts

CleanRun does not have a “call for a quote” option. Every price is written and delivered before work starts – Haven Standard Clause 1. If a contractor cannot give you a written price before touching your system, ask why. The written price is not a formality; it is the only document that protects you if the scope or cost changes mid-job. Call (469) 405-6133 and a live person will walk through what a written estimate for your home looks like before scheduling anything.

What the CleanRun Documentation Record Looks Like

Every job that leaves a CleanRun truck in Dallas produces the same deliverables, regardless of scope. The technician photographs the interior of every duct run before work begins – showing current condition, any visible debris, any structural failure points, and the before-state of every joint or connection being repaired. After the work is complete, every repaired area is photographed again, and the photo record is assembled into a documented job report delivered to the customer.

This is not a summary email with a few stock photos. The before-and-after images are specific to your system: your plenum, your runs, your register boots. A technician who shows you a photo of a 3-inch debris accumulation at the first supply elbow is showing you evidence. A technician who says “your ducts were really dirty” is asking you to take their word for it. CleanRun has held the documented photo standard on every job since the first service call in 2013, across more than 52,000 homes served.

The written warranty – the 365-Day Done Right Promise – is also part of the job record. If the repair does not hold, if leakage returns above the post-repair measurement, or if any documented finding was addressed incorrectly, CleanRun comes back and makes it right. That is a written commitment on every job record, under every technician’s name, backed by Haven Standard Clause 5.

Dallas Duct Repair Pricing vs. Surrounding Markets

Homeowners in Plano, Frisco, and Allen sometimes see slightly lower duct repair quotes than homeowners in Dallas proper, and the reason is not contractor pricing – it is house design. Newer construction in Frisco and McKinney (predominantly 2000-2020 builds) uses more accessible attic layouts with better clearance. A technician can move through those attics faster, which reduces labor time. Homes in older Dallas neighborhoods – Lakewood, M Streets, Oak Cliff, North Oak Cliff, Winnetka Heights – often have non-standard duct layouts, partial crawl space routing, or decades-old modifications that slow access significantly.

The material costs are the same across the metro. Flex duct, mastic, insulation wrap, and Aeroseal polymer pricing does not vary meaningfully between Dallas and Frisco. What varies is labor time, and labor time is driven by attic conditions, system age, and how many modifications the previous HVAC contractor made over 30 years of service calls.

Richardson and Garland homes from the 1975-1995 build window are a specific segment worth mentioning. Many of those systems used fiberglass duct board – a rigid, internally insulated duct material that was popular in North Texas for about 20 years. Duct board holds a mastic seal reasonably well when the board is intact, but after 30-plus years in a Texas attic, the board surface often shows delamination: the inner liner separates from the fiberglass body, restricting airflow and creating air quality issues as glass fiber fragments enter the system. Mastic does not fix delamination; those sections need replacement. A camera inspection will show it; the written estimate will scope it correctly. Learn more about what a full inspection covers on our home page.

FAQs – Duct Repair & Sealing Cost in Dallas

How much does duct sealing cost in Dallas for an average home?

For a 1,800-2,400 sq ft Dallas home, duct sealing runs $500-$1,400 depending on the method and number of connection points that need to be addressed. Manual mastic sealing on accessible joints lands at the lower end of that range; Aeroseal for the same home costs more ($1,200-$1,800) but reaches joints inside walls or above finished ceilings that a mastic brush cannot. The written price is always delivered before any work begins – call (469) 405-6133 for a free estimate specific to your home and system.

Is duct repair worth it in Dallas given the energy savings?

In most cases, yes – and the math is measurable. A Dallas home with 25% duct leakage pays to condition air that never reaches a living space; it goes into a 140-degree attic instead. At current Oncor rates, that can represent $40-$90 per month in wasted electricity during summer peak months. A $1,000 duct repair that reduces leakage from 25% to under 8% typically recovers its cost within 14-24 months in energy savings alone – and that is before accounting for reduced HVAC system wear from shorter runtime cycles. The Aeroseal printout shows pre-repair and post-repair leakage in CFM (cubic feet per minute), so the savings are documented rather than estimated.

Can duct repair be done in one day?

Most single-story Dallas homes – up to about 2,200 sq ft with attic-run duct systems – can have a full mastic repair job completed in 4-7 hours. Aeroseal jobs run 5-8 hours for the same size home because the pressurization and injection process requires setup and cure time. Two-story homes and any job involving plenum reconstruction typically require a full day. We schedule with enough time to do the documented photo record properly – the after photos are part of the deliverable, not an afterthought.

What is the difference between duct sealing and duct cleaning – and do I need both?

Duct sealing addresses structural failures: gaps, disconnections, and joint failures that let conditioned air escape before reaching living spaces. Duct cleaning addresses interior contamination: dust, debris, mold spore accumulation, and particulate buildup on duct surfaces. They are different problems with different solutions. Many Dallas homes built before 2000 need both – contamination builds up over time, and sealing a dirty duct system without cleaning it first locks the debris in place. If the camera inspection finds both conditions, the written estimate will scope both and show each line item separately so you can see exactly what you are approving.

How do I know if a duct repair quote in Dallas is fair?

A fair duct repair quote in Dallas is written, itemized by scope, and delivered before work starts. If a contractor quotes from the curb or over the phone without a camera inspection, the number is a guess – it will either be wrong or it will have room for add-ons once work begins. Specific line items to check: the number of duct runs being repaired, the sealing method (mastic vs. Aeroseal vs. foil tape), whether insulation wrap is included on repaired runs, and whether a post-repair photo record is included. If any of those are absent from the written price, ask for them in writing before signing anything. CleanRun’s Free Second Opinion puts our written number next to any competitor’s quote at no charge – call (469) 405-6133 and bring whatever estimate you have.

Does Dallas require a permit for duct repair?

For spot repairs – sealing joints, replacing a single flex duct run, or resealing register boots – no permit is typically required in Dallas. For work that replaces more than 50% of a duct system or involves modifying the supply or return plenum at the air handler, Dallas Development Services requires a mechanical permit. The fee runs $75-$200 depending on scope and is passed through at cost. Frisco, Plano, Garland, and Richardson have similar thresholds but their own fee schedules. Any reputable contractor will tell you upfront whether your job requires a permit – it should be documented in the written scope, not discovered after work begins.

Key Takeaways

• Duct repair and sealing in Dallas costs $350-$2,800 for most homes, with the majority of jobs in the $500-$1,400 range.
• Aeroseal costs more upfront ($1,400-$2,200 for a typical Dallas home) but reaches failures inside walls and chases that manual mastic cannot.
• The biggest Dallas-specific cost drivers are attic conditions, home age, and system layout – not contractor markup.
• A camera inspection is the only way to price a repair correctly; CleanRun credits the inspection fee toward same-day repair bookings.
• Every CleanRun job includes a written price before work starts, a documented before-and-after photo record of every duct run, and the 365-Day Done Right Promise in writing.
• Homes in Lake Highlands, Garland, Richardson, and Lakewood built before 1995 are the most likely to show leakage rates above 20% – often the result of original duct systems that have never been inspected or sealed.
• A Free Second Opinion on any written competitor estimate is available at no charge – call (469) 405-6133.

Get a Written Estimate for Duct Repair in Dallas

CleanRun Air Duct Cleaning Dallas schedules camera inspections across Dallas, Plano, Frisco, Garland, Richardson, Lake Highlands, Oak Cliff, and the surrounding metro. Every estimate is written, itemized, and delivered before any work starts – Haven Standard Clause 1. A live person answers every call, 24 hours a day. If you have a competitor’s written estimate, bring it: the Free Second Opinion puts CleanRun’s number next to it in writing at no charge, so you can compare scope and price before making any decision.

Call (469) 405-6133 to schedule a free estimate. Tomas Reyes and the CleanRun team have documented the inside of more than 52,000 Dallas-area duct systems since 2013 – every one with a written price before work started and a photo record when the crew left.

Pricing reflects the Dallas market as of 2026. CleanRun Air Duct Cleaning Dallas offers free estimates – call (469) 405-6133.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Dallas, serving Dallas, TX since 2013.