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
AfterLennox Air Duct Cleaning in Sterling, VA | CleanRun Air Duct Cleaning Leesburg
CleanRun provides independent Lennox Air Duct Cleaning in Sterling and repair across Sterling, VA, for homeowners who want their system diagnosed by technicians who know the difference between a Dave Lennox Signature variable-speed air handler and a Merit Series single-stage unit. We’re not a Lennox dealer or warranty center. We’re the crew Sterling Park and Cascades homeowners call when their Elite Series blower is clogged with fifty years of fiberglass batt debris or their flex duct is sweating in a 130°F attic. Call (571) 487-7204 for a written estimate before any work starts.
Why Sterling Residents Choose Us for Lennox Service
We’ve been in Sterling homes since 2013, and by now we know the two-story colonial on Shaw Road with the 1971 galvanized trunk isn’t the same job as the Cascades townhome with flex duct running through a vented attic. Tomas Reyes, our owner, grew up in Queens and learned the trade at Triangle Tech in New York before spending two decades on HVAC systems up and down the East Coast. He runs CleanRun on a straightforward principle: the camera goes in first, and every recommendation gets backed by a still frame or a written measurement. No phantom problems. No inflated scope.
Our technicians carry Lennox OEM-compatible filters and gaskets when they’re cost-effective, but we don’t pretend to be an authorized dealer. What we deliver is documented evidence: a photo record of every duct run before and after cleaning, a written price under Haven Standard Clause 1 before a single panel comes off, and the 365-Day Done Right Promise in writing on every job. Sterling homeowners who bought between 2015 and 2025 at Loudoun County price points tend to research before they call. We built our process for exactly that customer.
Lennox sales & service across Northern Virginia has become crowded with $79 coupon operators who run a shop vac for twenty minutes and call it done. Our equipment roster includes Rotobrush rotary systems, Nikro negative-pressure extractors, Abatement Technologies HEPA filtration, and Honeywell, Aprilaire, and Guardsman accessories - brands customers can verify independently. Every crew is background-checked and uniformed under Haven Standard Clause 3: Verified Crews.
Common Lennox Air Duct Cleaning Problems We Solve in Sterling
- Signature and Elite blower wheels clogged with fiberglass debris. In Sterling Park’s original 1967-1975 colonials, the Dave Lennox Signature Collection SL280V and Elite Series EL296V variable-speed air handlers pull return air through rigid galvanized steel trunks wrapped in first-generation fiberglass batt insulation. After fifty summers above 130°F in unconditioned attics, that insulation compresses and crumbles. The fibers migrate directly to the blower wheel and evaporator coil, reducing airflow and forcing the variable-speed motor to overwork.
- Merit and Elite flex duct delamination in Cascades attics. The Lennox Merit Series ML180 and ML193, along with Elite EL18XCV units in 1985-2000 Cascades townhomes, connect to flexible duct runs that sweat and sag in Sterling’s humid subtropical summers. Condensation pools in low spots, the duct liner separates from its wire helix, and the resulting gaps trap debris and harbor mold spores that enter the supply air.
- Condensate corrosion on high-efficiency Signature furnaces. The SL280V and SL297NV condensing furnaces produce acidic condensate that drains through small-diameter PVC. When return duct leaks in Sterling’s older homes pull unconditioned, humid attic air into the system, the condensate management components corrode faster than design specs anticipate. We document this with video inspection before recommending cleaning versus component replacement.
- Failed mastic seals on original Sterling Park trunk lines. Galvanized steel supply and return trunks serving Lennox systems in Sterling Park homes have mastic seals that dried and cracked over five decades. The resulting pressure imbalances cause the air handler to pull excessive dust through gaps near the plenum, loading the filter and coating the coil - a problem duct cleaning alone won’t solve without concurrent sealing.
- Pressure imbalances from mixed-era renovations. Sterling homeowners who’ve added finished basements or attic conversions often find their Lennox system was never rebalanced for the new load. The original duct sizing, adequate for 1972 square footage, becomes a restriction point that drives dust accumulation and uneven register output. Our video inspection measures actual airflow at each register against the manufacturer’s design tables.
Before
AfterLennox Service in Sterling: What Local Conditions Mean for Your Equipment
Sterling contains two distinct housing eras colliding in the same zip code, and that collision shapes every Lennox duct cleaning job we quote. The original Sterling Park subdivision, built 1967-1975, harbors some of Loudoun County’s oldest forced-air systems with mid-century sheet-metal ductwork now 50+ years old. Meanwhile, the massive Cascades and other Dulles Corridor subdivisions built 1985-2000 are hitting the 25-35-year threshold where flexible duct liners crack, delaminate, and mastic seals fail. Two separate waves of severely deferred duct maintenance are converging simultaneously in a way not seen in newer Ashburn to the west or more mixed-age Herndon to the east.
For Lennox owners, this split means diagnosis has to be neighborhood-specific. A Signature SL297NV in Sterling Park may be connected to a rigid trunk shedding fiberglass fibers into the air stream - a condition requiring rotary brush cleaning of steel, careful removal of compressed batt insulation, and resealing with modern mastic. The same model line in a Cascades colonial may be feeding through flex duct that’s sweating in a 130°F attic, which calls for soft-bristle tools that won’t tear the delaminating liner, plus repair or replacement of the damaged flex runs. We routinely carry both setups on the same truck. No neighboring zip code requires this split.
In Sterling Park, we cleaned a 1972 two-story colonial with a Lennox Elite EL296V furnace and found the original galvanized supply trunk wrapped in crumbled fiberglass batt insulation shedding fibers into the air stream. After a full video inspection, we sealed the trunk seams with mastic, replaced failing flex runs with R-8 insulated flex, and cleaned the blower and evaporator coil - restoring even airflow and cutting visible dust at the registers.
Lennox Models & Products We Service in Sterling
We work on the full Lennox residential lineup: Dave Lennox Signature Collection variable-speed and modulating systems including the SL280V and SL297NV; Elite Series two-stage and variable-capacity units including the EL296V and EL18XCV; and Merit Series single-stage equipment including the ML180, ML193, and ML14XC1 air conditioner. Our Sterling crews stock Lennox OEM-compatible filters and gaskets for common models, but for duct sealing, flex repair, and insulation replacement we use aftermarket materials that meet or exceed OEM specifications.
On systems over 20 years old with failing heat exchangers or compressors, we give an honest repair-vs-replace assessment. Duct cleaning alone won’t fix a cracked heat exchanger, and we’ll tell you that before we quote the work. Sterling service area coverage means we can return quickly if a cleaning reveals a larger issue.
Lennox Service Pricing in Sterling
Whole-system Lennox air duct cleaning in Sterling typically runs $450-$750 for a single-zone residential system, depending on duct material, accessibility, and whether sealing or flex repair is needed. Video inspection is included in every estimate. Duct sealing as a standalone service ranges $350-$600. Flex duct repair or replacement is quoted by the run, with written measurements from the video inspection.
What drives cost: rigid steel trunk systems in Sterling Park homes take longer to clean properly and often require insulation removal and resealing; Cascades-era flex duct may need section replacement rather than cleaning if delamination is advanced. Every price is written and agreed before work starts, under Haven Standard Clause 1. No per-vent pricing. No coupon bait-and-switch. Call (571) 487-7204 for an exact quote - estimates are free.
Serving Sterling, VA - Our Local Coverage Area
We’re based in the Sterling 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 - Lennox Air Duct Cleaning in Sterling
Yes. We use rotary brush systems sized for galvanized steel trunk lines, not aggressive tools meant for flex duct. The video inspection comes first to map the trunk condition, seam integrity, and any active rust spots. On 50-year-old Sterling Park systems, we often find the steel itself is sound but the mastic seals and external insulation have failed - those get addressed as separate line items in the written quote. Call (571) 487-7204 for an exact quote - estimates are free.
The smell is almost always mold or mildew in sweating flex duct runs that need Dryer Vent Cleaning in Sterling or full replacement. Sterling’s humid subtropical climate pushes attic temperatures above 130°F, and the temperature differential across thin flex duct liners causes condensation that pools in low sag spots. Lennox Merit and Elite systems in 1985-2000 Cascades homes are particularly prone because the original flex was often R-4 or R-6 insulation, inadequate for this climate. We video-inspect to locate the affected runs, replace them with R-8 insulated flex where needed, and clean the evaporator coil if cross-contamination has occurred.
No. Duct cleaning performed by a qualified technician does not void Lennox equipment warranties. We are independent Lennox service specialists, not manufacturer-authorized, but our work is documented and photographically recorded - documentation that supports, not jeopardizes, any future warranty claim. We do not perform work that would affect sealed refrigeration components or the heat exchanger; those remain under factory warranty terms.
For Sterling’s climate and housing stock, we recommend video inspection every 3-5 years. Sterling Park homes with original steel trunks and degraded insulation may need more frequent attention due to active fiber shedding. Cascades homes with flex duct in vented attics should be inspected for liner delamination every 3 years, especially if summer mustiness has been noticed. The 365-Day Done Right Promise covers our work if conditions recur. Call (571) 487-7204 for an exact quote - estimates are free.
Yes. While this page focuses on Lennox systems, our crews work on Trane, Carrier, Bryant, Rheem, and other major brands daily across Loudoun County. The Sterling housing factors - mixed-era construction, humid attics, deferred maintenance - affect all manufacturers similarly. Our equipment and documentation process is brand-agnostic.
Service Areas Near Sterling
CleanRun serves homeowners throughout Loudoun and Fairfax counties from our base near Ida Lee Park. Beyond Sterling, we provide Lennox service in Leesburg for the historic district and newer east-side developments, Lennox service in Ashburn for the Brambleton and One Loudoun areas, plus regular calls to Herndon, South Riding, and Great Falls. Each area has its own ductwork patterns and failure modes, and we adjust our approach accordingly.
Book Your Lennox Service in Sterling Today
Call (571) 487-7204 to schedule your Lennox system inspection. A live person answers, 24/7. We’ll send a uniformed, background-checked technician with a video camera and a written price before any work begins. Every duct run gets photographed. Every job carries the 365-Day Done Right Promise. The camera goes in before the quote comes out.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Leesburg, serving Sterling since 2013.