Duct Repair & Sealing in Potomac - Tested First, Written Price Second

Fast, Reliable Duct Repair & Sealing Across Potomac

Duct repair and sealing in Potomac typically runs $850-$2,400 for a full system, depending on whether we’re reconnecting crushed flex runs, replacing degraded liner, or sealing joints across multiple HVAC zones. Most Potomac homes need more than a surface cleaning - they need the connections tightened, the liner stabilized, and the leaks stopped at the source. Call (571) 487-7204 for a written estimate before any work starts.

Call (571) 487-7204

We’ve been driving the River Road corridor since 2013, and our Duct Repair & Sealing crews know what waits inside these large estate homes: original ductwork that kept running because the house was maintained beautifully, while the hidden system inside the walls slowly failed. Dispatch and scheduling are coordinated from our Washington, DC office, but the technicians who arrive at your door live and work in the Montgomery County area. They know the difference between a 1978 split-level off Falls Road and a 2005 teardown on a Persimmon Tree Road lot - and they know what each one’s ducts are likely hiding.

Why CleanRun Air Duct Cleaning Leesburg Is Potomac’s Preferred Duct Repair & Sealing Company

Potomac homeowners don’t buy from coupons. They buy from documentation. Since 2013, we’ve served 52,000+ homes with one rule: every job starts with a written price and ends with a photo record of every duct run. No exceptions.

Our reputation in Potomac was built on what we can show, not what we can claim. Customers here research before they call, and they stay because we deliver the evidence - before-and-after photos, written scopes, and a 365-Day Done Right Promise backed in writing on every job. Haven Standard Clause 1: written price before any work starts. Haven Standard Clause 3: Verified Crews, background-checked and uniformed, identified by name before arrival.

Response time to Potomac is typically same-week scheduling, not same-day theater. These are substantial jobs - multi-zone systems in 5,000+ square foot homes - and we don’t rush the inspection that determines the real scope. Our technicians carry professional-grade equipment from Rotobrush, Abatement Technologies, and Aprilaire, and they know the local failure patterns: the delaminating fiberglass liner on River Road, the humidity-driven mold near the river valley, the crushed flex runs buried above finished basements in the 1980s builds.

Our Duct Repair & Sealing Services in Potomac

Duct Sealing

Sealing is often the real fix in Potomac homes. The original mastic and tape on 1970s-1990s systems has dried, cracked, or simply failed after decades of thermal cycling. We seal supply and return joints with fresh mastic sealant and mechanical fasteners, then pressure-test the system to verify the seal. In a recent job off River Road, we measured a 22% air loss through disconnected joints before sealing - after, it dropped to 4%. The homeowner had been heating their crawl space for fifteen years.

Flex Duct Repair

Flex duct crushes, disconnects, or sags over time, especially in the long runs common to Potomac’s large homes. We find collapsed flex above finished basements, in attics where storage weight compressed the run, and at connections where the original zip-tie failed. Our crew replaces damaged sections with new insulated flex, supports it properly to prevent future sag, and seals the connections with mastic and mechanical bands. We document the repair with before-and-after photos of the specific run.

Metal Duct Repair

Sheet metal trunks in Potomac’s older estates often harbor the real problem: original fiberglass liner that has separated from the metal wall and crumbled into the airstream. This isn’t dirt. It’s structural degradation of the duct itself. We remove the failed liner under negative-pressure extraction with HEPA filtration, clean the metal shell, and apply new liner or seal the metal directly depending on the system’s design. On Persimmon Tree Road, we rebuilt a main supply trunk that had been shedding liner into three zones for years.

Duct Insulation

Potomac’s humidity makes uninsulated or degraded duct insulation a real problem. Condensation forms on cool supply ducts in summer, feeding mold growth that spreads through the system. We replace water-damaged or compressed insulation with new vapor-barrier-wrapped material, sealed at all seams, and we pay special attention to ducts running through the unconditioned spaces common in these large homes - attics, crawl spaces, and garage chases.

Air Leak Repair

Leaks at the plenum (the central distribution box), register boots, and duct connections are the silent efficiency killers in Potomac’s multi-zone systems. We pressure-test the entire system, mark every leak, and repair with mastic, foil tape rated for duct application, and mechanical reinforcement where needed. The goal is simple: the air you paid to condition should reach the rooms you intended.

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Trusted Brands We Service in Potomac

Our equipment roster includes Rotobrush for mechanical agitation, Abatement Technologies for negative-pressure containment, and Aprilaire for humidity control integration - brands customers can look up independently. We don’t claim performance beyond manufacturer specifications. What we do claim is this: every technician is trained on the specific equipment they’ll use in your home, and we stock common repair parts for Potomac’s most frequent failure modes so we’re not ordering flex duct or mastic sealant while your system stays open. The truck arrives ready to complete the documented scope.

Common Duct Repair & Sealing Problems We See in Potomac Homes

• Delaminating fiberglass liner in 1970s sheet metal. The River Road and Persimmon Tree Road corridors are ground zero for original fiberglass duct liner that has separated and crumbled inside the sheet metal, turning an entire large estate’s duct system into a debris reservoir. Because these high-value homes kept running on their original multi-zone systems for decades, we routinely find liner degradation, not just dirt, in Potomac.
• Disconnected or crushed flex runs in multi-zone systems. Homes with 4,000-8,000+ square feet and three or four HVAC zones have long flex duct runs that sag, crush under attic storage, or disconnect at joints. We find these during camera inspection, often in finished basement ceilings where access is limited and the damage was invisible to the homeowner.
• Humidity-driven mold and mildew near the river valley. Potomac’s topography traps summer humidity, and finished basements with in-ground equipment see persistently higher relative humidity. Mold colonizes the backside of registers and the surface of degraded liner, then spreads through leaks at joints that were never properly sealed.
• Aging connections on well-maintained homes. The original air handler kept running, so no one looked at the duct sealing. Pollen and humidity intrude through failing connections, and the system slowly loses efficiency while the homeowner blames the HVAC unit. The fix is sealing, not a new compressor.

Pricing for Duct Repair & Sealing in Potomac, MD

We Also Serve Cities Near Potomac

Our crews work throughout Montgomery County, including Duct Repair & Sealing in Potomac and surrounding areas: Rockville, Gaithersburg, Germantown, and Montgomery Village. The same written-price standard, the same photo documentation, the same 365-Day Done Right Promise applies to every home we enter.

FAQs - Duct Repair & Sealing in Potomac