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
McLean homeowners with multi-zone systems or aging original ductwork need repair crews who understand what they’re walking into before the basement door opens. We’re CleanRun Duct Repair & Cleaning, and our Duct Repair & Sealing in McLean crews dispatch from our Washington, DC office to handle everything from 9,000 sq ft custom builds with three separate air handlers to Broyhill-era ranches off Old Dominion Drive still running 1960s galvanized trunk lines. Call (240) 318-7712 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Alexandria Is McLean’s Preferred Duct Repair & Sealing Company
We’ve been working in McLean since 2013, and the photo records from our jobs tell the story better than any marketing copy. Our crews have documented repairs in more than 1,200 McLean homes, from the new construction clusters near George Bush Center for Intelligence to the original Broyhill McLean Estates subdivisions between Balls Hill Road and Old Dominion Drive.
McLean customers consistently cite two reasons they chose us over competitors: the written price delivered before a single panel comes off, and the before-and-after photo record of every duct run they receive as a standard deliverable. No manager approval needed. No “call for pricing.”
Our response time to McLean averages same-week scheduling, with dispatch coordinated from our DC metro office. Technicians are background-checked and uniformed under Haven Standard Clause 3: Verified Crews, and they arrive identified by name with license credentials visible.
The local knowledge matters. A crew that doesn’t recognize the difference between a 2023 multi-zone Carrier system and a 1967 galvanized trunk with delaminating fiberglass liner will quote the wrong scope and leave the real problem untouched. We’ve seen both in McLean, sometimes on the same street.
Our Duct Repair & Sealing Services in McLean
Duct Sealing
McLean’s bimodal housing stock means a duct sealing job here swings between 6,000-9,000 sq ft custom builds running three or more zoned air handlers and untouched Broyhill-era ranches still on original 1960s galvanized sheet-metal trunk lines - two entirely different sealing strategies on the same street. For the mega-estates, we seal per-system with full pressure balancing across zones; for the mid-century originals, we address failed joints and degraded liner before applying mastic. Every sealing job includes a written scope and photo documentation of each sealed joint.
Flex Duct Repair
The flex duct runs in newer McLean custom builds often fail at connection points when oversized systems short-cycle, creating pressure spikes that blow collars loose. We replace damaged flex sections with new insulated flex, secure with mechanical fasteners (not tape alone), and seal with mastic compound. In homes near the Potomac where summer humidity regularly pushes 70%, we verify the interior metal surface is dry before sealing - Haven Standard Clause 1 requires it, and applied sealant on damp substrate fails within a year.
Metal Duct Repair
Original sheet-metal trunk lines in McLean’s 1950s-1970s homes separate at longitudinal seams and joint connections after decades of thermal expansion cycling. We were called to a Broyhill McLean Estates colonial off Old Dominion Drive where the homeowner had been meaning to “demo the place next year” - for about a decade. Camera inspection down the supply and return ducts showed the original sheet-metal trunk line had separated at three joints, and the fiberglass liner had delaminated and was shedding into the airstream. We reconnected the trunk, wrapped the bare sections with duct insulation, and sealed every joint with mastic - no more debris blowing out of the registers.
Duct Insulation
Unconditioned attic and crawl space runs in McLean homes lose significant thermal efficiency, particularly in the sprawling custom builds where ductwork snakes through unconditioned roof spaces over 8,000 sq ft. We install foil-faced fiberglass duct insulation or closed-cell wrap on exposed metal, sealed at all seams with mastic. For the older Broyhill-era homes, we frequently find original fiberglass liner that has degraded to the point of shedding particles; we remove the failed material and install new external insulation rather than leaving degraded liner in the airstream.
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 professional-grade tools from brands customers can verify independently: Honeywell zone control panels and dampers, Aprilaire media air cleaners and ventilation controllers, and Abatement Technologies negative-pressure extraction systems. We stock common McLean-area parts for faster turnaround on repairs - no waiting on shipping for standard collar sizes, flex diameters, or mastic compounds. For zone control diagnostics on multi-system estates, we carry Honeywell and Aprilaire test equipment to verify damper operation and static pressure across all zones before declaring the job complete.
Common Duct Repair & Sealing Problems We See in McLean Homes
- Pressure imbalance blowouts in multi-zone custom builds. On 6,000+ sq ft custom builds with multi-zone systems, sealing one zone at a time without balancing the whole system leaves pressure imbalances that blow open flex duct connections the following season. We test static pressure across all zones before and after sealing.
- Delaminated fiberglass liner masking real leaks. In Broyhill-era ranches on original galvanized trunk lines, delaminated fiberglass liner shedding into the airstream masks the real leak at failed joints - techs seal the visible gap but the liner keeps degrading. Our camera inspection identifies both problems before quoting.
- Moisture-compromised sealant from short-cycling oversized systems. McLean’s dense hardwood canopy drives heavy pollen and organic debris loads that, combined with oversized systems short-cycling in July’s 70%+ humidity, keeps interior duct surfaces moist - sealant applied over damp metal fails within a year. We verify dry surfaces under Haven Standard Clause 1.
- Construction dust contamination in teardown-adjacent homes. McLean’s teardown-and-rebuild churn means neighboring homes frequently show elevated particulate loads and occasional drywall dust infiltration through compromised return pathways. We identify and seal these intrusion points during repair work.
Pricing for Duct Repair & Sealing in McLean, VA
Written pricing, delivered before work starts, every time. No exceptions.
| Service | Typical Range in McLean |
|---|---|
| Single-zone duct sealing (mastic, up to 12 joints) | $380-$650 |
| Multi-zone system sealing (per system, 2+ zones) | $520-$890 |
| Flex duct section replacement (per run) | $180-$340 |
| Metal trunk line repair and resealing | $450-$780 |
| Duct insulation wrap (per linear foot, exposed metal) | $14-$22 |
| Camera inspection with photo documentation | $95-$145 (credited toward repair if scheduled) |
McLean’s larger homes with multiple systems mean we quote per system, not per vent - a critical distinction. A 7,500 sq ft home with three Carrier zones might run $1,400-$2,400 for complete sealing across all systems, while a 2,200 sq ft Broyhill ranch with one original trunk line typically falls in the $380-$650 range. The written price covers the full scope; no per-vent add-ons, no “discovered issues” after work begins. Free estimates. Call (240) 318-7712.
We Also Serve Cities Near McLean
Our Duct Repair & Sealing crews regularly work in Alexandria, Arlington, Springfield, and Falls Church - the same written-price, photo-documented standard applies across the DC metro corridor. Scheduling is coordinated from our Washington, DC office with local crew dispatch to each community.
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
Yes, we quote per system because each is an independent sealed loop with its own static pressure profile and joint inventory. A typical multi-zone McLean home runs $520-$890 per system for complete mastic sealing and pressure balancing, with the full scope written before work starts under Haven Standard Clause 1. Call (240) 318-7712 for an exact count on your home’s configuration.
Often yes, if the trunk line is structurally intact and the damage is limited to separated joints and degraded liner. We camera-inspect first; if the metal is sound, we reconnect seams, remove shedding fiberglass, wrap with new insulation, and seal with mastic - typically $450-$780, versus $3,000+ for full replacement. The photo record shows you exactly what we found and what we did. Call (240) 318-7712 to schedule inspection.
Every CleanRun job concludes with three deliverables: a written scope of work performed, a 365-Day Done Right Promise backed in writing, and a Documented Photo Record showing the interior of every duct run before and after repair. You receive these as standard, not upon request. McLean homeowners with hidden basement and attic runs particularly need this evidence - we provide it without asking.
McLean’s dense hardwood cover produces pollen loads well above national averages, and July relative humidity regularly exceeds 70% - conditions that keep interior duct surfaces moist, particularly when oversized systems short-cycle. Sealant applied over damp metal or degraded organic substrate fails prematurely; our crews verify dry, clean surfaces before applying mastic, a step skipped by technicians unfamiliar with local conditions. This is why McLean-specific experience matters on your job.
Yes, and the effect is more pronounced in McLean’s larger homes where duct runs extend 200+ linear feet through unconditioned spaces. Department of Energy studies consistently show 20-30% HVAC energy loss through duct leakage; in a 6,000+ sq ft McLean home with three systems, that translates to measurable cooling load reduction, particularly in August when humidity extraction demand peaks. We don’t promise specific dollar savings - every home’s envelope and equipment differs - but we do guarantee the sealing work itself for 365 days, in writing. Call (240) 318-7712 for a free estimate with written pricing.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving McLean since 2013.