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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Before
AfterFast, Reliable Duct Repair & Sealing Across McLean
Duct repair and sealing in McLean, VA typically runs $380-$1,200 per system depending on accessibility, material type, and whether dead-leg runs from prior renovations need camera inspection before sealing work can begin. Most McLean homes require scoping across two or three separate systems, and we deliver a written price per system before any panel comes off. Call (240) 255-4519 for a free estimate with exact numbers for your house.
We serve McLean from our Washington, DC dispatch office, with crews running daily routes through the 22101 and 22102 corridors. You don’t need a technician who treats your home like a standard suburban call. McLean’s housing stock - large colonials, split-levels, and ranchers on wooded lots, many modified through successive renovations - produces duct problems that don’t match the simpler systems found in newer construction or denser neighboring jurisdictions. Our Duct Repair & Sealing team has handled these conditions since 2013, and we photograph every run before and after so you can see what was actually done.
Why CleanRun Air Duct Cleaning Rockville Is McLean’s Preferred Duct Repair & Sealing Company
McLean homeowners research before they call. We built our process around that.
Every job starts with a written price delivered before work begins - Haven Standard Clause 1, no exceptions. This matters in McLean because many homes here have multiple systems, and a single blanket quote either overcharges you or leaves the crew cutting scope once they’re inside. We scope per system, price per system, and put it in writing.
Our Documented Photo Record is included on every visit, standard. The inside of every duct run, before and after, delivered to you as part of the job record. In McLean’s market, where homes sell at premium prices and buyers request maintenance documentation, this record has tangible value beyond the immediate repair.
Tomas Reyes has led CleanRun since its founding in 2013. The company is independently owned and operated under the Haven Standard, not a franchise network, and every technician is background-checked and uniformed under Haven Standard Clause 3: Verified Crews. We publish our license number on every page because credentials should be verifiable, not claimed.
The 365-Day Done Right Promise backs every job in writing - if the work isn’t right, we make it right. Not a policy subject to manager approval. A written guarantee.
Our Duct Repair & Sealing Services in McLean
Duct Sealing
Leaky ducts in McLean homes waste 20-30% of conditioned air on average, per Department of Energy estimates, but the actual loss in older systems with renovation-patched trunk lines often runs higher. We seal supply and return plenums (the central distribution boxes), trunk takeoffs, and register boots using mastic sealant or foil-backed tape rated for HVAC use - not duct tape, which degrades. In McLean’s 1960s-70s colonials along Old Dominion Drive, we regularly find original stamped-metal trunks with cracked mastic from decades of thermal cycling; surface inspection misses these failures, so we pressure-test before sealing and photograph every joint after.
Flex Duct Repair
Flex duct - the insulated, flexible tubing common in basement extensions and attic runs - collapses, tears, or disconnects at takeoffs over time. McLean homes are particularly prone to this: many have flex extensions into finished basements or added third floors that were never properly supported, creating sag points where debris accumulates and moisture pools. We replace damaged sections with new R-6 or R-8 insulated flex, support it properly to prevent future sag, and seal all connections with mechanical fasteners plus mastic. A typical flex duct repair in McLean runs $280-$650 per run depending on length and accessibility.
Metal Duct Repair
Original galvanized steel trunk lines in McLean’s older homes corrode at seams, separate at slip joints, or get punctured during decades of in-place remodeling. We patch small breaches with sheet metal and mastic, replace rotted sections with matching gauge steel, and reseal all longitudinal seams. Metal repair costs more than flex - typically $450-$900 per section in McLean - but it preserves the original system’s airflow capacity where replacement would require re-engineering the whole distribution path.
Duct Insulation
Unconditioned attic and crawl space runs in McLean lose efficiency through conduction and gain moisture through vapor drive. We re-wrap accessible metal trunks with fiberglass insulation and vapor barrier, or replace degraded flex duct with properly insulated new material. Summer dew points here regularly exceed 70°F, and uninsulated or poorly insulated ductwork in vented attics sweats, promoting microbial growth that resealing alone won’t address. Insulation work in McLean typically runs $320-$780 per run depending on diameter and linear footage.
Mastic Sealant Application
Mastic is a water-based, fiber-reinforced sealant that remains flexible after curing, making it the preferred material for sealing metal duct joints in McLean’s climate. We apply it with a brush or spray at all trunk takeoffs, plenum connections, and register boots, then allow proper cure time before pressurizing the system. For homes with the failed original mastic common in 1960s-70s construction, we remove degraded material and reapply fresh sealant rated for the temperature cycling these systems see. Mastic sealing as a standalone service in McLean runs $340-$720 per system.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Before
AfterTrusted Brands We Service in McLean
CleanRun crews carry professional-grade equipment from trade-recognized brands: Rotobrush agitation systems, Nikro and Abatement Technologies negative-pressure extractors, Honeywell and Aprilaire air quality components, and Guardsman sealants. We stock Guardsman mastic and Honeywell dampers locally for McLean jobs, which means faster turnaround when a repair requires specific materials rather than generic substitutes. You can verify every product independently - we name them because evidence should be checkable, not claimed.
Common Duct Repair & Sealing Problems We See in McLean Homes
- Dead-leg flex extensions from successive renovations. In the established neighborhoods along Old Dominion Drive and Chain Bridge Road, 1960s-70s homes commonly have duct systems where the original stamped-metal trunk was extended with flex duct into a subsequently finished basement or added third floor - creating near-inaccessible dead-leg runs that no prior technician has ever reached, and that reliably contain 40-plus years of compacted debris.
- Failed mastic at original trunk takeoffs. Decades of thermal cycling and in-place remodeling in McLean’s pre-1990 colonials crack seals that a surface inspection won’t reveal. We pressure-test these joints because visual checks miss the gaps that matter.
- Moisture-laden insulated flex duct in unconditioned spaces. McLean’s heavy oak, tulip poplar, and maple canopy produces some of the highest airborne pollen loads in the mid-Atlantic, and it infiltrates through older, loosely fitted return-air grilles. Combined with 70°F-plus summer dew points and long HVAC runtimes, this creates microbial growth inside attic and crawl space flex runs that resealing alone won’t fix.
- Modified return paths from basement finishes and bump-out additions. McLean’s renovation pattern - additions rather than teardowns - frequently leaves return ducts undersized or rerouted through convoluted paths, creating pressure imbalances that strain equipment and uneven temperatures between floors.
Pricing for Duct Repair & Sealing in McLean, VA
Here’s what duct repair and sealing actually costs in McLean’s market:
| Service | Typical Range in McLean |
|---|---|
| Mastic sealing per system | $340-$720 |
| Flex duct repair/replacement per run | $280-$650 |
| Metal duct repair per section | $450-$900 |
| Duct insulation per run | $320-$780 |
| Camera inspection with agitation (dead-leg access) | $180-$340 per run |
| Full system assessment with written scope | Free |
McLean homes often have two or three separate HVAC systems - main floor, basement, and sometimes a third-floor addition - and we price per system, not per vent. No per-vent pricing. No teaser coupon that balloons once the truck arrives. One flat price per system, agreed in writing before work starts, every time.
What moves the number: accessibility (crawl space vs. walk-up attic), material type (flex vs. metal), whether camera inspection and agitation are needed to reach dead-leg runs, and whether insulation replacement is bundled with sealing. We scope it, photograph it, and write the price. You approve it before we start.
Bring a competitor’s written estimate - CleanRun provides a Free Second Opinion, our number next to theirs, no cost.
We Also Serve Cities Near McLean
Our crews run daily routes through McLean, Reston, Sterling, Arlington, and Herndon. Same written-price process, same Documented Photo Record, same Haven Standard coverage. Call (240) 255-4519 to schedule or request a free estimate in any of these areas.
Serving McLean, VA - Our Local Coverage Area
We’re based in the McLean area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Duct Repair & Sealing in McLean
Most McLean homes built between the 1960s and 1990s have two or three separate HVAC systems - main floor, basement finish, sometimes a third-floor addition - each with its own duct network, plenum, and return path. A single quote either averages across systems and overcharges you for the simple one, or underestimates the complex one and leaves the crew cutting scope mid-job. CleanRun scopes and prices each system separately, in writing, before work starts. Call (240) 255-4519 for a free assessment of your specific configuration.
We use camera inspection and agitation tools under negative-pressure extraction to locate and access dead-leg runs that standard NADCA cleaning can’t reach. In McLean’s established corridors along Old Dominion Drive and Chain Bridge Road, these runs are common - flex extensions into finished basements or added floors with no accessible register, sometimes abandoned mid-renovation. The camera shows us what’s there before we write the scope. The photo record shows you what we found and what we did.
You receive three concrete deliverables: a written scope of work with the agreed price, a Documented Photo Record of every duct run before and after, and a written 365-Day Done Right Promise. The photo record is the critical one - it shows the condition of each run at the start and the sealed, cleaned state at completion. In McLean’s market, where home values are high and buyers request maintenance records, this documentation has lasting value beyond the immediate repair.
McLean’s combination of heavy tree cover, 70°F-plus summer dew points, and long HVAC runtimes creates conditions that attack flex duct from the inside and outside. Pollen and moisture infiltrate through older return grilles, then condense in cool attic runs during peak cooling season. Microbial growth degrades the insulation and inner liner. Sealing the connections helps, but if the flex itself is moisture-damaged, replacement with properly supported, adequately insulated new material is the durable fix. We photograph the interior to show you which condition applies.
Yes, and McLean’s conditions can push toward the higher end of that range. The dense oak, tulip poplar, and maple canopy produces exceptional pollen loads that infiltrate older duct systems through loosely fitted returns. Dead-leg runs from decades of renovations hold compacted debris that recirculates. And the renovation pattern common here - successive additions rather than teardowns - means many homes have duct networks that were never designed as integrated systems, creating pressure imbalances that draw garage, crawl space, or attic air into living spaces. Source removal plus proper sealing addresses the root cause, not just the symptom.
Schedule Your McLean Duct Repair & Sealing Assessment
Call (240) 255-4519 to speak with a live person - we answer 24/7 - and schedule your free assessment. We’ll scope your system, identify any dead-leg runs or failed seals, and deliver a written price per system before any work starts. Every job includes a Documented Photo Record and the 365-Day Done Right Promise, backed in writing.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving McLean since 2013.
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