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
AfterWhy Herndon Homeowners Choose Lennox Air Duct Cleaning
CleanRun Air Duct Cleaning services in Herndon provides independent Lennox air duct cleaning, repair, and sealing service for homeowners in Herndon, VA, with documented photo records of every duct run and written upfront pricing before any work begins. We are not affiliated with or authorized by Lennox Industries; we are a local, independently owned crew that has worked on Lennox systems since the original Dave Lennox Signature Collection era and today services everything from builder-grade Merit furnaces to Elite-series variable-speed air handlers. Our difference is evidence: every job starts with a written price under Haven Standard Clause 1 and ends with before-and-after photos inside every duct run. Call (571) 520-6317.
Why Trust CleanRun Air Duct Cleaning Herndon for Your Lennox Air Duct Cleaning?
Tomas Reyes, who leads our crew, grew up in Queens, NY, where his father ran a building maintenance operation out of a rented garage. That early exposure to mechanical systems stuck. He trained at New York City College of Technology in Brooklyn, picked up the fundamentals of HVAC systems and indoor air quality, then spent two decades working through every type of ductwork a Mid-Atlantic home can throw at you. For several years now, Tomas and our team have been who Herndon residents call - including homeowners near the historic downtown core along Elden Street - when they want Lennox service in Herndon with a documented inspection, not a sales pitch.
We know Lennox equipment specifically. We’ve opened hundreds of Lennox duct systems in Northern Virginia homes, pressure-mapped the static profiles, and documented what we found. We understand how Lennox variable-speed blowers respond to duct restriction, how their cased coils collect debris in humid attics, and how their iComfort-enabled air handlers report airflow faults that trace back to duct-side problems, not equipment failures. We use OEM Lennox or exact-fit aftermarket parts where they are commonly available, and we perform warranty-safe service that does not compromise manufacturer coverage.
Our equipment roster includes Rotobrush flexible-shaft systems, Nikro negative-pressure extractors, Abatement Technologies HEPA containment, and Honeywell, Aprilaire, and Guardsman air quality components - tools you can look up independently before you agree to any price. Every technician is background-checked and uniformed under Haven Standard Clause 3: Verified Crews. We publish our license number on every page, not buried in a footer.
“Show the photo first. Then explain what it means. The estimate comes after that.” That’s how Tomas trained our crew to approach every Lennox system we open in Herndon.
Common Lennox Air Duct Cleaning Problems We Fix in Herndon
- Secondary heat exchanger dust loading on ultra-low-NOx and high-efficiency furnaces. Lennox EL296V and SL280V units with secondary heat exchangers collect fine dust on the coil face over time. In Herndon, where 1980s-1990s townhomes often have original return ductwork with degraded fiberglass duct board, filter bypass is common. That bypass dust is finer than what a standard pleated filter catches, and it plates onto the secondary heat exchanger, driving pressure drop and nuisance high-limit trips. The furnace throws a fault code; the homeowner calls for equipment service; the real problem is upstream in the return duct. We find this with video inspection and static pressure testing, then clean the exchanger face and seal the return leaks so it stays clean.
- Constant-torque blower wheel caking on Elite and Signature variable-speed air handlers. The EL18XCV, EL296V, and SL22KLV use constant-torque or variable-speed blower motors that modulate airflow precisely. When the blower wheel cakes with fine filter-bypass dust - the kind that gets through degraded duct board seams in Herndon’s original townhome construction - the motor compensates by drawing more current. Homeowners hear it as a low hum that gets louder over months. Rooms at the end of long duct runs drift from setpoint. We pull the blower assembly, clean the wheel and housing, then pressure-map the system to find the duct leaks that caused it.
- Wet-fiber matting on cased coil evaporator faces. Lennox CX34 and C33 cased coils in Herndon attics face a specific problem: Northern Virginia’s humid subtropical summers push attic temperatures and humidity to extremes. When return duct sealing has failed on 30-45-year-old fiberglass duct board, warm humid attic air infiltrates the return plenum. The evaporator runs colder than design because the mixed air is warmer and wetter, and the coil face develops a matted layer of wet fiber and biofilm. This restricts airflow, reduces latent capacity, and produces the musty odor that sends homeowners searching for “duct cleaning near me.” We clean the coil face with foaming cleaner and soft brushes, then seal the return plenum and duct board joints with mastic.
- Flex duct collapse and sag at trunk takeoffs. In the dense 1980s townhome clusters off Elden Street and around the Herndon Parkway corridor, Lennox flex duct runs branch through shared party-wall chases. The original flex is often 30+ years old. It collapses against joists, sags below insulation, or pulls loose at takeoff collars. The result: one bedroom never hits setpoint, or a bathroom stays cold, and the homeowner blames the EL16XC1 or ML14XC1 outdoor unit. Our techs run a video inspection through the flex, find the collapse or sag, and repair with properly supported new flex or rigid pipe where the chase allows. This is duct-side work, not equipment replacement.
- iComfort airflow imbalance from duct restriction. Lennox iComfort-enabled air handlers in newer Herndon homes - often 2015-2025 builds in the Dulles corridor - report precise airflow data. When a duct run is partially blocked by collapsed flex, debris at an elbow, or a damper that has shifted in a shared-wall chase, the iComfort system logs airflow faults that look like equipment problems. We’ve traced these to duct-side restrictions repeatedly. Our approach: video inspection to locate the restriction, cleaning or repair to resolve it, then verification that the iComfort airflow readings return to manufacturer spec.
BeforeAfterLennox Parts & Our Repair-vs-Replace Approach
We stock OEM Lennox flex duct, takeoff collars, plenum fittings, and mastic-compatible foil tape on our Herndon-area trucks. For cased coil cleaning, we carry foaming cleaner rated for aluminum fins and polymer drain pans. For blower wheel cleaning, we use soft-bristle brushes that won’t damage the balanced assembly.
When a Lennox duct section is too far gone - crushed flex, duct board that has delaminated and is shedding glass fibers into the airstream, or a return plenum with structural failure - we tell you honestly. No upsell. We write the scope, show the photo, and give you a price that covers exactly what we proposed. Ducts are repaired or replaced with compatible materials, not swapped to a different brand of equipment. Your Lennox furnace, air handler, or heat pump stays in place; we fix what moves the air through it.
Call (571) 520-6317 for a written estimate. Bring a competitor’s quote; we’ll put our number next to it under our Free Second Opinion policy.
Our Lennox Service Process - Step by Step
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Diagnosis with video inspection and static pressure test. We insert a lighted camera into every accessible duct run and record static pressure across the Lennox air handler. For iComfort systems, we log airflow readings where the homeowner reports a problem. We show you the footage before proposing any work.
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Written scope and price under Haven Standard Clause 1. The scope lists exactly what we found, exactly what we’ll do, and exactly what it costs. No per-vent pricing, no add-ons after we start. You approve in writing before a single panel comes off.
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Cleaning, sealing, or repair with documented photo record. We clean with Rotobrush flexible-shaft systems where rigid equipment can’t reach Herndon’s party-wall chases. We seal with mastic and foil tape. We replace flex or fittings only where necessary. Every duct run is photographed before and after.
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System test and pressure verification. We restart the Lennox unit, verify static pressure improvement, check iComfort airflow readings if applicable, and confirm no new fault codes. The documented photo record is delivered as part of your job file.
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365-Day Done Right Promise in writing. If the work is not right, we make it right. The promise is backed in writing on every job, not stated only in marketing copy.
Lennox Products We Service & Install in Herndon
We service and clean duct systems connected to Lennox Merit Series equipment including the ML14XC1 air conditioner, ML180 and ML195 gas furnaces; Elite Series including the EL296V variable-speed furnace, EL18XCV air conditioner, and EL16XC1; Dave Lennox Signature Collection including the SL280V and SL22KLV furnaces and XC21 air conditioner; and Complete Comfort Series / iComfort-enabled air handlers. We do not sell new Lennox equipment; we clean, seal, and repair the duct systems that serve it. For homeowners in nearby areas seeking Reston Lennox service, we apply the same expertise. For Herndon homeowners with 1980s-1990s duct board in need of replacement, we install new flex, rigid, or duct board compatible with any of these model families.
We Also Service These Brands
Our crew is multi-brand trained and equally familiar with Trane and Carrier duct configurations, blower assemblies, and coil designs. The diagnostic process is the same: video inspection, static pressure test, documented photo record, written price before work begins. Herndon homeowners with mixed-brand neighborhoods or prior equipment changes get the same evidence-based service regardless of what’s on the nameplate.
FAQs - Lennox Air Duct Cleaning Service in Herndon
No. We are an independent, local service provider with no affiliation or authorization from Lennox Industries. Our expertise comes from hands-on work on hundreds of Lennox systems in Northern Virginia, not from manufacturer certification. We use OEM or exact-fit aftermarket parts and perform warranty-safe service that does not void Lennox coverage.
It can be. The iComfort system calculates filter life based on airflow resistance and runtime. If your return duct has leaks - common in Herndon’s original 1980s-1990s fiberglass duct board - the system draws more unfiltered attic air, the filter loads faster, and the thermostat flags it early. We find these leaks with smoke testing and video inspection, then seal them so the filter lasts its rated life. Call (571) 520-6317 for a written estimate.
We inspect and clean the secondary heat exchanger face when our diagnosis shows dust loading from filter bypass - a common finding on EL296V and SL280V units in Herndon homes with degraded return ductwork. This is not a default add-on; we propose it only when the video inspection and static pressure test show it’s needed. The work is performed with soft brushes and vacuum extraction, not compressed air that could drive debris deeper.
Often yes. Short-cycling on a variable-speed Lennox unit - EL18XCV, EL296V, or SL22KLV - frequently traces to duct-side pressure imbalance. When supply or return leaks throw off the airflow profile, the system hits its safety limits and ramps down prematurely. We seal the leaks, verify static pressure with a manometer, and confirm the unit runs its full modulation range. Call (571) 520-6317 to schedule a pressure test.
On many CX34 and C33 cased coils, yes. The cased coil design includes an access panel on the front or side that allows localized cleaning with foaming cleaner and soft brushes. We video-inspect first to confirm the coil face is accessible and the contamination is surface-level, not deep in the fin pack. If the coil is structurally damaged or the drain pan is compromised, we’ll show you and write a replacement scope honestly.
We replace flex duct that has sagged below insulation, collapsed at takeoffs, or degraded structurally. Cleaning alone on sagging flex is temporary; the restriction returns. We show you the video, explain whether the run can be re-supported or needs replacement, and write a price for exactly that scope. No default replacement, no default cleaning-only. Call (571) 520-6317 for an exact quote - estimates are free.
For homeowners needing Lennox service in Sterling or a typical Herndon townhome with a Lennox furnace or air handler and 8-12 duct runs, whole-system cleaning with video inspection, documented photo record, and basic sealant application runs $450-$750. Evaporator coil cleaning adds $180-$280. Duct sealing with mastic and foil tape on degraded joints runs $350-$600 depending on accessible linear footage. Full flex duct replacement in attic or party-wall chases runs $85-$140 per run. Every price is written and agreed before work starts, under Haven Standard Clause 1. Call (571) 520-6317 for an exact quote - estimates are free.
Book Your Lennox Service in Herndon, VA
Call (571) 520-6317 to speak with a live person, 24/7. We’ll schedule a documented inspection of your Lennox duct system, deliver a written price before any work begins, and back the result with our 365-Day Done Right Promise. Every call is answered by a person, not a queue. Every technician is background-checked, uniformed, and identified by name before arrival. Every job ends with a photo record of what we found and what we did.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Herndon, serving Herndon since 2013.