Lennox Air Duct Cleaning Service Nationwide

Why San Antonio Homeowners Choose Lennox Air Duct Cleaning

CleanRun provides independent San Antonio Lennox service for air duct cleaning and repair throughout the area, from Alamo Heights to Stone Oak, with written upfront pricing and a documented photo record of every duct run. We carry OEM-compatible Lennox components for Dave Lennox Signature Collection, Elite, and Merit Series systems, and every job is backed by our 365-Day Done Right Promise. Call (726) 600-7155 for a free estimate.

Call (726) 600-7155

We’ve worked on Lennox equipment across San Antonio since 2013. That includes G-series furnaces still running in Monte Vista craftsman homes, Merit Series ML180 and ML193 units in 1990s Helotes tract builds, and recent Dave Lennox Signature Collection SL280V and SLP98V installs in newer Stone Oak subdivisions. We know how Lennox cabinet geometry, coil placement, and ECM blower airflow interact with the flex-duct and duct-board trunk lines that dominate San Antonio housing stock. As an independent company, we are not affiliated with or authorized by Lennox. We carry OEM-grade Lennox-compatible components, which means we diagnose what’s actually in front of us rather than selling a manufacturer-preapproved fix.

San Antonio’s climate creates specific stress on Lennox systems. Summer attic temperatures above 150°F degrade flex-duct seams. Winter cedar pollen coats return plenums. Humid spring air hits evaporator coils in oversized configurations. These aren’t abstract problems - they’re what we photograph on camera scopes every week.

Why Trust CleanRun Air Duct Cleaning San Antonio for Your Lennox Air Duct Cleaning?

Tomas Reyes, who leads our crew, trained in HVAC systems technology at Queensborough Community College and spent years doing hands-on ductwork across the Northeast before shifting focus to San Antonio. He’s logged thousands of hours cleaning ducts in this market, including tract homes near Stone Oak where flex duct collapses and dust accumulation tend to be textbook examples of what we talk about on every job. Over the course of his career, Tomas has become known for one thing: pulling out a camera scope before he writes a single number on a quote sheet. “The camera goes in first. Then we talk.” That practice is now standard across every CleanRun crew.

Our Lennox work is specific. We understand that iComfort-controlled variable-speed blowers on SL280V and SL297V furnaces run at low continuous fan speeds that can push fine dust past standard filters, depositing it on secondary heat exchanger fins. We know that Signature Collection cabinet designs with tight plenum connections are prone to fiberglass duct board disintegration when paired with high-static ECM blowers. We stock genuine OEM Lennox filters, gaskets, and coil clips alongside premium aftermarket equivalents - MERV 11 to 16 media, foil-backed flex, mastic rated for 250°F - so the duct side matches the equipment side.

Every technician is background-checked and uniformed under Haven Standard Clause 3: Verified Crews. License numbers are published on every page, not buried in a footer. We use professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, Honeywell, Aprilaire, and Guardsman - brands customers can look up independently. Every job starts with a written price before any panel comes off, and concludes with a Documented Photo Record of every duct run, delivered as a standard deliverable.

Common Lennox Air Duct Cleaning Problems We Fix in San Antonio

• Cabinet sweating and microbial growth on Merit ML180/ML193 evaporator coils. San Antonio’s humid spring air hits these furnaces hard when they’re paired with oversized or mismatched coils inside 150°F attics. The cabinet exterior sweats, the coil fins grow a biofilm mat, and the blower wheel distributes musty odor through every supply register. We clean the evaporator coil and blower assembly, then check whether the ductwork is pulling unconditioned attic air through gaps that exaggerate the humidity load.
• Fiberglass duct board disintegration at Signature Collection plenum connections. The SL280V and SLP98V use high-static ECM blowers that create pressure spikes at the cabinet-to-duct junction. Installers who strapped flex duct tight to the plenum without adequate support create vibration wear. Over five to seven years, the duct board sheds particles directly into the supply stream. Our camera scope shows the difference between surface dust and structural breakdown - we seal or rebuild the connection with foil-backed flex and mastic, not just vacuum around it.
• iComfort low-speed fan depositing dust on secondary heat exchanger fins. The modulating blower on SL280V and SL297V units runs continuous circulation at speeds too low for standard pleated filters to catch fine particulate. At the five- to seven-year mark, we find a felt-like accumulation on the secondary heat exchanger that restricts airflow and triggers “System Airflow Restricted” warnings. Cleaning the heat exchanger fins and upgrading to MERV 13+ media with a properly sized return path solves the root cause.
• R-22 and early R-410A coils icing over, then dripping into duct board. Older Lennox evaporator coils with inadequate return-air filtration ice up during San Antonio’s peak summer cooling load. The thaw cycle dumps water into the return plenum, causing duct board delamination and mold odor throughout the trunk line. We clean the coil, verify refrigerant charge and airflow, and replace water-damaged duct sections - not just mask the smell with sanitizer.
• Downflow furnace return leaks in hall closet installations. Lennox downflow units in closet returns are common in San Antonio’s 1970s-90s builds. The return platform is often framed with untreated wood that rots where condensate or humid return air seeps through gaps. We seal the cabinet-to-platform joint, replace degraded return duct with foil-backed flex, and document the pressure drop improvement.

Before

After

Lennox Parts & Our Repair-vs-Replace Approach

We stock genuine OEM Lennox filters, gaskets, and coil clips at our San Antonio warehouse. We also carry premium aftermarket equivalents: MERV 11 to 16 media, foil-backed flex rated for attic temperatures, and mastic rated for 250°F continuous exposure. The choice between OEM and aftermarket depends on what’s failing and why. A cracked heat exchanger on a 20-year-old G-series furnace means we tell you honestly - duct sealing and coil cleaning make sense on a healthy system, not as a cover for a replacement-level failure.

Our repair-vs-replace decision is documented in writing before any work starts, under Haven Standard Clause 1. If a competitor has already quoted replacement, bring their written estimate. We’ll put our number next to it for a Free Second Opinion. Call (726) 600-7155.

Our Lennox Service Process - Step by Step

1. 1
   Diagnosis with camera scope. We insert a lighted camera into every accessible duct run, starting at the plenum. For Lennox systems, we pay specific attention to the cabinet-to-duct junction, the evaporator coil visible through the access panel, and the blower wheel condition. The footage goes to the customer as part of the Documented Photo Record.
2. 2
   Written scope and price. Before any panel comes off, we deliver a written price for the exact work: evaporator coil cleaning, air handler cleaning, duct sealing, or full system cleaning. No per-vent pricing. No add-ons after the truck arrives.
3. 3
   Repair and cleaning execution. We use negative-pressure extraction with Rotobrush and Nikro equipment, Abatement Technologies HEPA containment where needed, and Guardsman-sourced components for Lennox-compatible replacements. Coil cleaning includes foaming cleaner and fin comb inspection. Duct sealing uses mastic and foil tape rated for San Antonio attic conditions.
4. 4
   Pressure test and verification. We measure supply and return static pressure before and after. On the Alamo Heights SL280V job, supply static dropped from 0.72 to 0.48 in. w.c. after we sealed the cabinet-to-duct joint and rebuilt the wet return trunk. That number goes in the job record.
5. 5
   Documented Photo Record delivery and 365-Day Done Right Promise activation. Every customer receives before-and-after photos of every duct run, the written scope, and the written warranty. If it’s not right, we make it right - backed in writing, not subject to manager approval.

Lennox Products We Service & Install in San Antonio

We service and clean the full Lennox residential line: Dave Lennox Signature Collection furnaces (SL280V, SLP98V) and air conditioners (XC25); Elite Series variable-speed systems (EL296V, EL16XC1); Merit Series single-stage and two-stage furnaces (ML180, ML193) and air conditioners (ML14XC1); and Lennox variable-speed air handlers with iComfort thermostat controls. We stock filters, gaskets, and coil clips for all series, and we carry foil-backed flex and mastic for duct-side repairs that match Lennox cabinet specifications.

We Also Service These Brands

CleanRun is not a single-brand shop. We carry OEM-compatible components for Trane and Carrier systems as well, and our technicians are trained on the cabinet geometries, coil placements, and blower configurations that distinguish each manufacturer’s airflow design. The diagnostic process is the same: camera scope first, written price second, documented work third.

FAQs - Lennox Air Duct Cleaning Service in San Antonio

Is CleanRun Air Duct Cleaning San Antonio authorized by Lennox?

No. We are an independent Lennox service provider, not affiliated with or authorized by Lennox Corporation. We carry OEM-grade Lennox-compatible components and service the equipment based on what we find, not a manufacturer script. This independence means we can recommend repair over replacement when it makes sense, and we can source premium aftermarket parts when they match or exceed OEM specifications.

My Lennox iComfort thermostat shows “System Airflow Restricted” - is that a duct cleaning issue or a blower problem?

It can be either, or both. On SL280V and SL297V furnaces, the modulating blower runs continuous low-speed circulation that deposits fine dust on secondary heat exchanger fins over five to seven years. That restriction reads as an airflow fault. We camera-scope the ductwork first to rule out collapsed flex or blocked returns, then inspect the heat exchanger and blower wheel. The fix may be coil and blower cleaning, duct sealing, filter upgrade to MERV 13+, or a combination. Call (726) 600-7155 and we’ll put a scope in to find out.

Can you clean the ductwork on a Lennox system that uses a downflow furnace in a hall closet?

Yes. Downflow Lennox units in closet returns are common in San Antonio’s 1970s-90s housing stock. The return platform and vertical trunk are accessible through the return grille and platform access panel. We photograph the full return path, clean with negative-pressure extraction, and seal any cabinet-to-platform gaps that are pulling humid air from the crawl space or adjacent wall cavity. The closet installation actually makes the return side easier to inspect than attic-mounted upflow systems.

Will duct cleaning void my Lennox warranty?

No, provided the work is done without altering factory components. We do not cut into sealed heat exchangers, modify control boards, or replace OEM parts with unlisted substitutes. Our evaporator coil cleaning, air handler cleaning, and duct sealing are performed through manufacturer-designed access panels using tools and materials that meet or exceed Lennox specifications. We document our methods in writing if warranty documentation is ever requested.

My Lennox Merit ML180 has rust on the secondary heat exchanger fins - can dirty ducts be the cause?

Dirty ducts contribute, but they’re rarely the sole cause. The ML180’s secondary heat exchanger runs cooler than the primary, so any moisture from an oversized coil, humid return air, or condensate drainage problem condenses there first. Dirty ducts raise the humidity load by restricting airflow and extending run times. We clean the ducts, verify the evaporator coil drainage, and check whether the return path is pulling unconditioned attic air. If the heat exchanger is cracked, we’ll tell you - no duct cleaning fixes that.

Do you clean both the supply and return sides on a Lennox Signature Collection system?

Yes. Signature Collection systems with high-static ECM blowers move air aggressively through both sides. Cleaning only the supply and ignoring the return leaves the pollen, dust, and biofilm source untouched. We camera-scope and photograph every accessible run on both sides, clean with negative-pressure extraction, and seal any plenum or trunk-line gaps. The before-and-after photo record shows both sides.

How much does Lennox air duct cleaning cost in San Antonio?

Whole-system Air Duct Cleaning services for Lennox in San Antonio typically runs $450-$850 for a standard single-system home, depending on duct accessibility, contamination level, and whether evaporator coil or air handler cleaning is included. Duct sealing adds $200-$400. We deliver one flat price per system, agreed in writing before work starts - no per-vent pricing, no add-ons after arrival. Call (726) 600-7155 for an exact quote; estimates are free.

Book Your Lennox Service in San Antonio, TX

Call (726) 600-7155 to schedule your Lennox system evaluation. A live person answers every call, 24/7. We’ll send a background-checked, uniformed technician with a camera scope, deliver a written price before any work starts, and leave you with a Documented Photo Record of every duct run and our 365-Day Done Right Promise in writing.

Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving San Antonio since 2013.