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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AfterFast, Reliable Duct Repair & Sealing Across McLean
Most McLean homes need duct repair or sealing because of two problems that rarely exist in the same suburb: decades-old fiberglass duct board shedding into the airstream, or brand-new multi-zone systems still full of construction debris. We dispatch crews to McLean from our Washington, DC office, and we schedule repair work by the system, not by the vent, because that’s how large homes here are actually built. Call (240) 363-3380 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Washington Is McLean’s Preferred Duct Repair & Sealing Company
We’ve been documenting every duct run with before-and-after photos since 2013. That practice matters more in McLean than almost anywhere else in Northern Virginia.
McLean’s housing stock is split between aging 1960s-80s colonials and split-levels that have never had their original duct systems replaced, and newly built 6,000-10,000 sq ft luxury replacements where post-construction drywall dust and insulation debris are still embedded in brand-new ductwork - a bimodal pattern driven by the area’s relentless tear-down-and-rebuild cycle that sets it apart from neighboring Fairfax County suburbs like Vienna or Falls Church. A technician who only knows one of those two worlds will miss problems in the other. Our crews have handled both on the same street.
Our McLean customers receive a written price before any panel comes off, a Documented Photo Record of every duct run, and the 365-Day Done Right Promise backed in writing on every job. Haven Standard Clause 1 requires it. Tomas Reyes, who leads CleanRun, established that protocol in 2013 and has not waived it once across 52,000+ homes.
All technicians are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews. We do not send subcontractors whose names we do not know.
Our Duct Repair & Sealing Services in McLean
Duct Sealing
McLean’s larger homes - whether vintage colonials in Chesterbrook or new construction off Georgetown Pike - run duct systems through finished basements, attics, and crawlspaces where joints separate under thermal stress. We seal every joint at the air handler, plenum (the main distribution box), trunk lines, and registers using mastic sealant, not tape that degrades. In multi-zone homes with three or more systems, we price by the system so you’re not paying per-vent for identical work repeated across identical equipment.
Flex Duct Repair
Flex duct, the insulated flexible tubing common in basement retrofits and attic runs, fails at the elbows and where it connects to metal trunk lines. McLean’s 70°F+ summer dew points - standard in the humid Piedmont corridor above the Potomac River valley - drive condensation inside inadequately insulated flex duct, particularly in deep finished basements. That moisture collapses insulation R-value and triggers mold growth a visual check won’t reveal. We replace failed sections with properly insulated flex duct and seal the transitions with mastic.
Metal Duct Repair
Original galvanized metal ducts in 1960s McLean homes rust at the seams where fiberglass insulation wraps trap moisture. We cut out corroded sections, fabricate replacements, and rebuild transitions with metal and mastic sealant. In Broyhill McLean Estates and similar neighborhoods, we’ve found metal trunk lines that were never sealed at installation - air leaks into basement cavities that the homeowner paid to heat and cool for decades.
Duct Insulation
McLean’s climate demands proper duct insulation more than drier western Virginia markets. Uninsulated or degraded ductwork in attics and crawlspaces loses conditioned air before it reaches the register. We install professional-grade insulation from Abatement Technologies and Guardsman, specified to manufacturer standards and photographed before and after. In new construction with long runs through finished basements, missing or compressed insulation is a builder oversight we document and correct.
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.
BeforeAfterTrusted Brands We Service in McLean
Our equipment roster includes Rotobrush for mechanical agitation inside duct runs, Nikro for negative-pressure extraction (the suction system that captures loosened debris), and Abatement Technologies for HEPA filtration and insulation materials. We also install Aprilaire air quality components where duct repair reveals gaps the original builder left unaddressed. These are trade-recognized brands - McLean homeowners can look up specifications independently before agreeing to our written price. We stock parts for common McLean system configurations, so repair work isn’t delayed waiting for a distributor run to Fairfax.
Common Duct Repair & Sealing Problems We See in McLean Homes
- Delaminating fiberglass duct board in vintage homes. In unrenovated 1960s McLean homes that escaped the tear-down wave, technicians regularly find original fiberglass duct board lining that has delaminated over decades, shedding glass fibers directly into the airstream - a failure mode that neighboring newer-suburb markets like Reston or Ashburn almost never present at the same frequency or scale.
- Construction debris in new custom homes. In new 6,000-10,000 sq ft custom homes with multiple HVAC zones, post-construction drywall dust and insulation debris embedded in brand-new ductwork clogs the blower motor and distributes fine particulate through supply and return ducts - and builders often skip sealing the long runs through finished basements.
- Condensation damage in deep basements. McLean’s position in the humid Piedmont corridor produces summer dew points exceeding 70°F, driving condensation inside inadequately insulated flex duct in deep finished basements. The resulting mold growth and insulation failure require duct replacement, not just cleaning.
- Unsealed joints in multi-system homes. Large homes with three or more separate HVAC systems accumulate dozens of unsealed joints at the air handler, plenum, and register connections. Each leak pressurizes basement cavities and wastes conditioned air - the cumulative loss across multiple systems often exceeds 20% of total airflow.
Pricing for Duct Repair & Sealing in McLean, VA
A typical single-system duct sealing in McLean runs $480-$720. Flex duct repair or replacement on one system ranges $340-$580 depending on linear footage and basement accessibility. Metal duct repair - cutting out corroded sections and fabricating replacements - typically falls between $620 and $1,100 per system. Duct insulation work, common in attic and crawlspace runs, runs $420-$780 per system based on surface area and material thickness.
Homes with multiple systems receive per-system pricing, not per-vent multiplication. A three-system colonial in Chesterbrook with unsealed joints at every register might total $1,440-$2,160 for complete sealing - one written price for the scope, agreed before work starts, with no add-ons once the truck is on your driveway. That price includes the Documented Photo Record delivered as a standard job record.
Bring us a competitor’s written estimate and we’ll provide a Free Second Opinion at no cost. Call (240) 363-3380.
We Also Serve Cities Near McLean
Our Duct Repair & Sealing crews work throughout Northern Virginia, including Arlington, Alexandria, Falls Church, and Springfield. Each city’s housing stock presents different duct failure patterns - Arlington’s condo conversions, Alexandria’s historic rowhomes - and we adjust our approach accordingly. McLean remains our largest concentration of both vintage fiberglass-duct-board homes and new multi-zone construction.
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
Pricing should be per-system, not per-vent. A three-system home in McLean has three air handlers, three plenums, and three separate sets of trunk and branch lines - essentially three complete duct systems that happen to serve the same house. We quote each system individually so you see exactly where the work applies, then total the scope in one written price before any panel comes off. Call (240) 363-3380 for an exact quote - estimates are free.
New ductwork frequently arrives with drywall dust, insulation debris, and unsealed joints the builder never addressed. In McLean’s tear-down-and-rebuild market, we’ve found brand-new multi-zone systems with blower motors packed with construction particulate and long basement runs leaking at every connection. The ducts are new. They are not necessarily clean or sealed. Our camera inspection shows you the difference before you agree to any work.
Visible white or yellow fibers at registers, increased dust accumulation on surfaces near return-air vents, and a persistent fine particulate that recurs immediately after cleaning. In Broyhill McLean Estates, our crew opened up a 1968 colonial with three separate systems and found the original fiberglass duct board lining shed glass fibers directly into the return-air airstream - the blower motor cabinet was packed with it, and the long trunk runs through the finished basement had never been sealed. We performed camera inspection, removed the failed board, rebuilt the transitions with metal and mastic sealant, then sealed every joint on all three systems at the air handler and registers using our Rotobrush and Nikro equipment to hold NADCA standards. The homeowner had been breathing that fiberglass for years without knowing it. If your home matches this profile, schedule a camera inspection before assuming replacement is the only option.
McLean’s large-lot homes almost universally include deep finished basements with duct runs concealed behind drywall or drop ceilings. Leaks in these hidden lines pressurize wall cavities and waste conditioned air where the homeowner cannot see it. Summer dew points above 70°F compound the problem by driving moisture into unsealed joints, accelerating corrosion and mold. Sealing accessible joints with mastic, and documenting the work with photos of what was found, is the only verifiable solution.
Yes - a Documented Photo Record of every duct run, before and after, delivered as part of the standard job record. Haven Standard Clause 1 requires written pricing before work starts; our documentation protocol requires photographic evidence of what was found and what was changed. You receive both deliverables: the written scope with pricing, and the photo record with timestamps. If the 365-Day Done Right Promise is invoked, those photos establish the baseline. Call (240) 363-3380 to schedule.
Ready for a written estimate on duct repair or sealing in McLean? Call (240) 363-3380. A live person answers every call, and we’ll deliver a written price before any work begins - no exceptions, no per-vent games, no add-ons once we’re on site.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Washington, serving McLean since 2013.