Fast, Reliable Duct Repair & Sealing Across Arlington
Most Arlington homeowners with pre-war homes need duct sealing or repair at some point, and in this town the job is rarely straightforward. We dispatch crews daily from our Washington, DC office to Arlington’s tight lots and older neighborhoods, and we know the difference between a standard patch and the kind of coal-era trunk work these houses actually require. Call (844) 685-6342 for upfront pricing and a crew that arrives when we say we will.
Why Bellows Air Duct & Vent Co. Is Arlington’s Preferred Duct Repair & Sealing Company
We’ve been at this since 1984. Ray Castillo built this company on the idea that a homeowner should never have to argue about whether a job was done right. That’s why our Duct Repair & Sealing team carries a 90-Day Done Right Promise on every Arlington visit, stamped in writing with no paperwork required if something needs attention.
Arlington customers call us back because we show them their ducts before we touch them. Every job starts with a camera inspection and ends with one. You see the leak, the gap, the coal-era trunk connection. Then you see it sealed. No claims without proof.
Our office answers calls live, 24 hours a day. Not an app. Not a voicemail tree. A real person who can get a background-checked, uniformed technician to your door in Arlington, usually same-day. We’ve served this corridor long enough to know which streets have alley access only, which basements flood in spring, and why a two-family on Massachusetts Avenue needs a different approach than a single-family off Mystic Valley Parkway.
Our Duct Repair & Sealing Services in Arlington
Duct Sealing
Arlington’s gravity-furnace conversions are our specialty. In the two-family homes that dominate this market, retrofitted return plenums are commonly cut directly into the original coal-era gravity furnace casing. That means a “repair” job often requires sealing the entire 80-year-old trunk, not just a visible leak. We use Guardsman mastic sealant rated for these conditions, applied with proper surface prep so it actually bonds to century-old metal. Foil tape won’t hold here. We don’t use it.
Flex Duct Repair
When central air was retrofitted into Arlington’s Craftsman bungalows and Colonial Revivals, contractors ran flex duct through original plaster-and-lath framing in whatever path they could find. Sharp bends, crimps, and sagging runs are standard. Our Rotobrush flexible-shaft equipment navigates these obstructions where rigid tools fail, and we replace damaged flex with properly sized, insulated runs that don’t kink behind your walls.
Metal Duct Repair
The large-diameter sheet-metal trunks in 02474 and 02476 have carried 60-80 years of layered coal soot, conversion debris, and biological buildup. Standard cleaning intervals underestimate this. When we repair metal duct in Arlington, we’re often working through corroded seams, failed original rivets, and sections that have settled with the house. We patch with matching gauge metal, seal with mastic, and reinforce where the duct has taken structural stress.
Duct Insulation
Arlington sits in the Mystic River watershed, and the low-lying eastern sections near Alewife Brook in 02476 see humidity that destroys poorly insulated basement and crawl-space ductwork. Condensation forms on cold metal during summer shoulder months, saturating old fiberglass wrap and breeding mold. We install new duct insulation with proper vapor barriers, sized for Arlington’s moisture load, not a dry-climate specification.
Mastic Sealant
We specify Guardsman mastic for Arlington’s conditions because it remains flexible through freeze-thaw cycles and bonds to surfaces that foil tape simply won’t adhere to. In humid basement environments, tape peels. Mastic doesn’t. We apply it with proper cure time, not rushed, so the seal lasts.
Air Leak Repair
Leak detection in Arlington requires understanding how these houses breathe. Return plenums connected to coal-era trunks pull air from places they shouldn’t, basement ducts leak into crawl spaces, and retrofitted supply runs lose pressure through gaps no homeowner can see. Our camera inspection finds the source. Then we fix it, not just the symptom.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Arlington
We carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, the same brands serious HVAC contractors specify for tight-access residential work. For Arlington’s older housing stock, that means flexible-shaft tools that navigate plaster-and-lath obstructions, HEPA containment for coal-era debris, and mastic application systems that work in cramped basement headroom. Parts and materials are stocked for fast turnaround. Most Arlington repairs are completed in a single visit.
Common Duct Repair & Sealing Problems We See in Arlington Homes
- Technicians using standard rigid tools can’t navigate the sharp bends and plaster-and-lath obstructions common in pre-war Arlington homes, leaving sections of duct unsealed and leaking. We’ve been called in after other companies to finish what their equipment couldn’t reach.
- In 02476’s low-lying areas near Alewife Brook, condensation in poorly insulated basement ducts causes mastic sealant to fail prematurely, especially during humid shoulder months. The fix isn’t reapplying mastic. It’s insulating properly so condensation doesn’t form in the first place.
- DIY or non-specialist sealing of retrofitted return plenums often misses the coal-era trunk’s hidden gaps, so air keeps bypassing into unheated crawl spaces. Homeowners feel the draft, smell mustiness, and can’t figure out why their bills stay high. We find the actual source.
- On a recent job along Massachusetts Avenue, our tech found a two-family Colonial Revival where the upstairs unit’s return plenum had pulled away from the original gravity furnace casing, sucking unconditioned attic air and old coal soot into the living space. We re-secured the connection, applied Guardsman mastic sealant to the entire seam, and insulated the exposed run with new duct wrap, restoring proper airflow and cutting the homeowner’s energy bill estimate by 15%.
Pricing for Duct Repair & Sealing in Arlington, VA
We don’t do bait coupons. The price we quote on the phone is the price on the invoice. Here’s what Arlington homeowners typically see:
| Service | Typical Range in Arlington |
|---|---|
| Single duct leak sealing (mastic) | $180 - $340 |
| Flex duct section repair/replacement | $260 - $480 |
| Metal duct patch and seal | $220 - $420 |
| Duct insulation (per run, basement/crawl) | $320 - $580 |
| Coal-era trunk resealing (two-family) | $480 - $860 |
| Full return plenum reconnection and seal | $560 - $940 |
Actual cost depends on access, extent of damage, and whether we’re working around active HVAC. Every estimate is free, presented upfront, and valid for 30 days. We also honor our standing offers: $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Call (844) 685-6342 for your exact number.
We Also Serve Cities Near Arlington
Our crews work throughout the corridor, including Arlington neighbors in McLean, Alexandria, Annandale, and Burke. Same standards, same live-answer dispatch, same camera-verified results. If you’re unsure whether we cover your address, call and we’ll tell you straight.
Serving Arlington, VA - Our Local Coverage Area
We’re based in the Arlington 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 Arlington
Mastic is the only sealant that bonds reliably to the coal-era metal, layered soot, and irregular surfaces found in Arlington’s pre-war ducts. Foil tape fails within months on these surfaces, especially in humid basement conditions. We’ve removed failed tape jobs from homes in 02474 and 02476 and resealed properly with Guardsman mastic. Call (844) 685-6342 for a free inspection of your existing seals.
Most Arlington double-decker return duct damage can be patched if the surrounding metal is structurally sound. We camera-inspect first to check for hidden deterioration, then patch with matching gauge metal and mastic-seal the seam. If the duct has settled with the house or the coal-era trunk is compromised, we’ll show you and quote replacement honestly. Estimates are free.
Yes, proper duct insulation with a vapor barrier is the most effective mold prevention for Arlington’s basement and crawl-space ducts, particularly in low-lying 02476 near Alewife Brook. Uninsulated cold metal condenses moisture during humid shoulder months. That moisture feeds mold. Insulation stops the condensation. We size and install for this specific moisture load.
Yes, and this is exactly the repair we perform regularly in Arlington’s two-family homes. The connection between retrofitted plenum and original gravity casing is almost always leaking, often pulling unconditioned air and old soot into your living space. We re-secure the mechanical connection, mastic-seal the entire seam, and insulate exposed runs. Camera verification confirms the seal before we leave.
We use Rotobrush flexible-shaft equipment and Nikro HEPA-contained tools designed for tight, obstructed access. In Arlington’s plaster-and-lath construction, we rarely need to open walls. Our technicians navigate existing chases and register openings, with camera guidance to confirm complete coverage. If wall access is unavoidable, we mark the precise location and discuss minimal-opening options with you first.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Arlington and local communities for over 42 years.