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 Denver Homeowners Choose Lennox Air Duct Cleaning
CleanRun Air Duct Cleaning services in Denver provides independent Lennox air duct cleaning, repair, and sealing service for homeowners across the metro area. Our technicians work on Dave Lennox Signature Collection, Elite Series, and Merit Series systems daily, and every job starts with a written price before we touch a single panel. Call (720) 799-2292 for a free estimate.
We’re not affiliated with Lennox, and we’re not authorized by them. That’s the point. As an independent service provider, we diagnose what your system actually needs rather than what a brand playbook says to sell. We’ve cleaned and serviced thousands of Lennox units across the Front Range, from builder-grade Merit Series furnaces in Stapleton rehabs to Dave Lennox Signature Collection variable-speed systems in Cherry Hills Village. Denver’s mile-high elevation forces blower motors to run longer cycles to move equivalent air volume, and our semi-arid climate keeps fine prairie soil suspended rather than clumped, so debris accumulates faster here than at sea level. We factor that into every Lennox service in Denver we perform.
Why Trust CleanRun Air Duct Cleaning Denver for Your Lennox Air Duct Cleaning?
Tomas Reyes, our owner, learned ductwork fundamentals at Apex Technical School in Manhattan and spent years doing commercial and residential systems across the Northeast before bringing that experience to Denver in 2013. His crew has been servicing Lennox equipment here for over a decade, including jobs in Capitol Hill where original gravity-furnace “octopus” duct runs retrofitted for forced air create dead-end sections that collect compacted debris for decades. Tomas still photographs every register, plenum, and main trunk line before and after work, a practice he started on day one.
Our Lennox familiarity runs deep. We know that EL296V two-stage furnaces often show blower wheel imbalance from debris accumulation. We’ve seen CBX40UHV air handlers with evaporator coils so fouled that static pressure readings climb past 0.8 inches water column. We stock Lennox-compatible OEM gaskets and mastic locally, and we use professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, Honeywell, Aprilaire, and Guardsman on every job. Every technician is background-checked and uniformed under Haven Standard Clause 3: Verified Crews. The 365-Day Done Right Promise backs every repair in writing, not as a policy subject to manager approval.
Here is what the camera found. Here is what it costs to fix it. You decide.
Common Lennox Air Duct Cleaning Problems We Fix in Denver
- Fiberglass duct board degradation in Signature and Elite Series systems. Lennox installations in Denver’s dry climate often use duct board that crumbles at plenum connections, shedding fibers directly into the airstream. The low humidity dries the binder faster than in moist regions, so we inspect every connection point before applying negative-pressure extraction. If the board is structurally failing throughout, we recommend partial replacement rather than cleaning alone.
- Mastic and foil tape failure at seams and joints. Denver’s extreme temperature swings, from sub-zero mornings to 70-degree afternoons in winter, cause thermal expansion that cracks mastic and peels foil tape. Lennox systems in west-side neighborhoods like Harvey Park and Barnum, where 1950s-1970s ranch homes still run original sheet-metal ductwork sealed with asbestos-containing mastic, require particular care. We assess before disturbing any connection.
- Evaporator coil fouling in cased coils like the CX34. The coil sits downstream from the blower and collects everything the ducts carry. In Denver, fine dust from easterly prairie winds plus wildfire ash from Front Range fire seasons embeds in the fins, reducing airflow and causing freeze-ups or overheating. We clean coils as part of full system service, not as an add-on.
- Blower wheel imbalance in variable-speed air handlers. Lennox SLP98V and EL18XCV systems use variable-speed motors that modulate airflow precisely. Debris accumulation on the blower wheel throws off that balance, causing vibration, noise, and reduced efficiency. We remove and clean the wheel when indicated, documenting before-and-after condition with photos.
- Disconnected flex runs and collapsed ductwork in attic installations. We recently serviced a Denver home with a Lennox EL296V furnace and CBX27UH coil where the homeowner complained of dust and high energy bills. Our video inspection revealed torn duct board and disconnected flex runs in the attic, plus a heavily fouled evaporator coil. We cleaned the entire system, sealed the ductwork with mastic, and restored proper airflow, dropping the static pressure from 0.9 to 0.5 in. w.c.
BeforeAfterLennox Parts & Our Repair-vs-Replace Approach
We stock Lennox-compatible OEM gaskets, mastic, and flex duct when available. When OEM parts carry extended lead times or inflated pricing, we use high-quality aftermarket components: UL-listed flex duct, HVAC-rated mastic that meets or exceeds OEM specs, and metal-backed tape rated for temperature cycling. Haven Standard Clause 1 requires the written price to reflect the actual components used, not a generic estimate.
For Lennox repair in Englewood and surrounding areas, we default to repair. Duct board degradation localized to a plenum connection gets sealed or patched. Flex duct with a single tear gets replaced by the run, not the whole system. We only recommend full replacement when duct board is structurally failing throughout multiple runs, which is uncommon in systems under 25 years. Every recommendation includes the photo evidence that supports it. Call (720) 799-2292 and we’ll put our assessment in writing next to any competitor’s quote, free.
Our Lennox Service Process - Step by Step
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Diagnosis with video inspection. We feed a camera through every accessible duct run, plenum, and trunk line, documenting debris type, duct board condition, and connection integrity. For Lennox systems, we pay particular attention to evaporator coil access panels and blower wheel housing, as these are common failure points in Denver’s high-dust environment.
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Written scope and price. Before any work begins, you receive a written price covering the full system cleaning, any indicated coil cleaning, and duct sealing requirements. No per-vent pricing. No open-ended hourly rates. Haven Standard Clause 1.
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Cleaning and repair with documented photo record. We use negative-pressure extraction, agitation tools appropriate to duct material, and HEPA containment. Every register, plenum, and main trunk line is photographed before and after. Coil cleaning and blower wheel service are performed when indicated, with photos of fin condition and wheel balance.
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Testing and verification. We measure static pressure across the system, verify airflow at registers, and confirm proper operation of variable-speed components. For Lennox variable-capacity systems, we verify the control board reads appropriate airflow ranges.
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Deliverables and warranty. You receive the complete photo record, written scope, and 365-Day Done Right Promise documentation before we leave. If anything isn’t right, we make it right. That’s in writing, not marketing copy.
Lennox Products We Service & Install in Denver
We regularly service Dave Lennox Signature Collection systems including the SL280V variable-speed furnace and SLP98V modulating furnace; Elite Series two-stage and variable-capacity units including the EL296V and EL18XCV; Merit Series single-stage and entry-level equipment including the ML180 and ML14XC1; and Complete Comfort Series air handlers including the CBX27UH and CBX40UHV with cased coil configurations. We stock OEM-compatible components for coil cleaning, plenum sealing, and flex duct replacement on our Denver trucks, so most Lennox duct and airflow issues resolve in a single visit.
We Also Service These Brands
CleanRun technicians are multi-brand trained. We service Trane and Carrier systems with equal familiarity, and we’ve worked on every major residential HVAC brand installed in Denver since the 1980s. Our equipment roster, including Rotobrush, Nikro, and Abatement Technologies, handles any duct configuration we encounter.
FAQs - Lennox Air Duct Cleaning Service in Denver
Every three to five years for most Denver homes, sooner if you’ve had wildfire smoke events, recent renovation, or visible debris at registers. The Front Range’s intensifying fire seasons, including the 2021 Marshall Fire that sent smoke particulates across the metro, embed fine ash deep in duct systems that standard filtration misses. Call (720) 799-2292 and we’ll inspect with a camera to give you a specific interval based on what we find.
Yes. Restricted airflow from debris buildup or disconnected duct runs triggers high-limit switches in Lennox furnaces, causing the unit to heat, shut off prematurely, and restart. The EL296V and similar two-stage units are particularly sensitive because the control board monitors pressure differential across the heat exchanger. We’ve restored normal cycling by cleaning fouled evaporator coils and sealing leaky return ductwork that the homeowner didn’t know was disconnected.
We use Lennox-compatible OEM parts when available and cost-appropriate, and we substitute high-quality aftermarket components, like UL-listed flex duct and HVAC-rated mastic, when they meet or exceed OEM specifications. Haven Standard Clause 1 requires us to specify what’s being used in your written price before work starts.
Sometimes. Noise from a Lennox variable-speed air handler often traces to blower wheel imbalance caused by debris accumulation, or to duct board deterioration that creates turbulence at the plenum. Our video inspection identifies which cause applies. If it’s debris, cleaning resolves it. If it’s structural duct failure, we show you the photo and quote the repair.
No. Lennox warranties cover defects in materials and workmanship on equipment components, not maintenance or cleaning. Our service as an independent provider does not affect your factory warranty, provided we don’t modify equipment in ways the manufacturer prohibits. We document our work so any warranty claim remains straightforward.
Lennox Air Duct Cleaning in Greenwood Village, CO and throughout Denver typically runs $450 to $850 for a standard single-furnace home, depending on system accessibility, duct material, and whether evaporator coil cleaning or duct sealing is indicated. Two-furnace homes or systems with extensive flex duct replacement needs range higher. We deliver one flat price per system, agreed in writing before work starts, with no per-vent add-ons. Call (720) 799-2292 for an exact quote, estimates are free.
Book Your Lennox Service in Denver, CO
Call (720) 799-2292 to schedule your Lennox system inspection. A live person answers, 24/7. We’ll send a background-checked, uniformed technician who will show you what the camera finds, put the price in writing before any work begins, and leave you with a documented photo record of every duct run. The 365-Day Done Right Promise covers every job in writing.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Denver since 2013.