Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Lennox Air Duct Cleaning in San Antonio, TX | Cardinal Air Duct San Antonio
We’re an independent Lennox duct cleaning and repair provider serving San Antonio and the surrounding Hill Country, including our Dryer Vent Cleaning in San Antonio. The one thing that makes our Lennox work different here? We understand how caliche dust and cedar pollen interact with Lennox’s variable-speed blowers and high-MERV filtration in ways that generic duct cleaners miss. If your Lennox system is moving less air than it should, call (254) 347-3897 for a straight answer and a written price before any work starts.
Every job we run on Lennox equipment in San Antonio starts with the same question: where is the restriction actually coming from? Omar Haddad, our owner, spent nearly two decades pulling contaminated duct systems apart before building Cardinal Air Duct around a simple rule: show the customer the problem, quote the fix, prove the work. No vague estimates, no surprise charges. We run Lennox sales & service support across the full model range, from mid-1990s Dimension units to current Signature Collection systems. We’re not manufacturer-affiliated or authorized. We’re independent. That means we answer to you, not to a corporate warranty desk.
Why San Antonio Residents Choose Us for Lennox Service
We work on Lennox duct systems every week in San Antonio. That familiarity matters more than most homeowners realize. A Lennox SL280 in a 1970s tract home near Lackland AFB behaves differently than the same unit in a new build up in Timberwood Park. The duct layouts are different, the return paths are different, and the contaminants are different. We know what to look for because we’ve seen it hundreds of times.
Omar learned his trade fundamentals at Los Angeles Trade-Technical College, then spent two decades in San Antonio attics and crawlspaces learning what this city’s summers do to HVAC systems. His crew runs Rotobrush agitation systems paired with Nikro HEPA extraction units, and they understand negative-pressure containment well enough to explain it in plain English. The short version: loosened debris gets pulled into the vacuum, not blown around your living room.
When we service your Lennox equipment, you get a background-checked technician in uniform, a written price before a single duct is touched, and the 365-Day Done Right Promise. If the work isn’t right within a year, we return and correct it at no charge. That’s not a sales line. It’s the standard.
Styles & brands we work with
Common Lennox Air Duct Cleaning Problems We Solve in San Antonio
- Variable-speed blowers pulling fine caliche and cedar pollen deep into flex ducts. Lennox high-efficiency units with ECM blower motors move air differently than older PSC motors. The variable speeds keep air circulating longer, which means finer particulates work their way deeper into duct runs. In San Antonio, that particulate is caliche dust from our limestone-heavy soil and juniper pollen from the Hill Country. The result is premature loading of pleated media filters and reduced airflow across the evaporator coil. We clean the full duct run, not just the first few feet from the register.
- Biofilm shedding from humid attic installations into supply ducts. Older Lennox heat exchanger designs with tight drain pan clearances struggle in San Antonio’s humid summers. Condensation sits longer, biofilm forms on the coil and pan, and when the AC cycles on, those biological particles end up in the supply ducts. We see this constantly in homes inside Loop 410 where attic ventilation is poor. The fix starts with cleaning the coil and pan, then treating the supply ducts to remove what already shed off.
- Sagging flex duct in pier-and-beam crawlspaces under Jefferson and Beacon Hill homes. Lennox multi-position air handlers installed horizontally in older crawlspaces often have flex duct that sags at the first elbow from the plenum. That sag creates a collection point for whatever is in the crawlspace: rodent debris, caliche dust, insulation fibers. We repair and re-support the duct, then clean what’s left downstream. If the flex is original 1990s material, we usually recommend replacement with R-8 insulated duct rather than trying to clean something that’s already compromised.
- iComfort airflow restriction codes that aren’t the thermostat’s fault. Lennox iComfort communicating systems monitor airflow continuously. When return ducts are partially collapsed or coated with Saharan dust, the system throws airflow reduction codes. Homeowners call us thinking the thermostat or blower motor is bad. Most of the time, the equipment is fine. The ducts are the problem. We run a video inspection first, confirm the restriction, and clean or repair the duct rather than selling you a part you don’t need.
- White dust coating furniture inside Loop 410 homes. That fine white film on your furniture every week? It’s caliche dust re-circulating through your duct system. Lennox systems with high-MERV filters should trap this material, but when the filter is loading too quickly or the return ducts have gaps and leaks, the dust bypasses the filter entirely. We seal the return path, then clean the supply side so the dust stops at the filter the way it should.
Lennox Service in San Antonio: What Local Conditions Mean for Your Equipment
San Antonio’s Jefferson and Beacon Hill neighborhoods sit on a shallow limestone shelf. That’s not geological trivia. It directly affects how your Lennox system breathes. The limestone leaches fine white caliche dust into crawlspaces, and when a Lennox air handler draws return air from a pier-and-beam floor, that dust enters the duct system continuously. Once inside, it mixes with cedar pollen from the Hill Country and rodent dander from the crawlspace itself. The result is a gritty, allergenic coating on the inside of your ducts that generic duct cleaning leaves behind.
Here’s what we mean by that. A standard duct cleaning pass with a vacuum wand will remove loose debris from the first few feet of a duct run. But caliche dust is fine and sticky. It adheres to the duct walls and to the residue left by years of pollen and humidity. Removing it requires mechanical agitation (our Rotobrush system) combined with HEPA negative-air extraction. One without the other just stirs the dust up and lets it settle back down. That’s why we run both on every Lennox duct cleaning in San Antonio, regardless of how old the system is or which neighborhood it’s in.
A recent job in a 1998 Lennox Elite 90 furnace in a Beacon Hill bungalow showed exactly this pattern. The return duct had collapsed under the pier-and-beam floor. The blower was coated in fine caliche dust. Flex duct had been chewed through by squirrels, mixing insulation fibers into the airstream. We repaired the metal return plenum, replaced the collapsed flex run with new R-8 insulated duct, sealed every joint with mastic, then cleaned the evaporator coil and blower wheel. Airflow at the farthest supply register went from 280 CFM to 410 CFM. The homeowner told us dust stopped settling on furniture within a day. That’s what a proper fix looks like.
Lennox Models & Products We Service in San Antonio
We service every Lennox model line you’re likely to have in a San Antonio home. That includes the Signature Collection (SL280, XC20), the Elite Series (EL296, EL16XC1), the Merit Series (ML180, ML14XC1), and the Dave Lennox Signature Collection (SLP98V). The approach changes with the system: variable-speed and communicating units get a video inspection first to document airflow before and after cleaning, while older fixed-speed systems get a standard full-run cleaning with the same Rotobrush and Nikro equipment.
For critical components like ECM motors and control boards, we use OEM Lennox replacement parts. Period. These are engineered to Lennox’s airflow tolerances and a generic board often causes more problems than it solves. For duct accessories like collars, flex runs, mastic, and grilles, we select commercial-grade aftermarket parts that meet or exceed OEM spec. You pay less for the same performance where it counts. If a Lennox air handler or coil is beyond repair due to duct contamination, we say so plainly and help you plan a staged replacement rather than sealing compromised ductwork around a failing unit.
We also carry the inspection and sealing tools that make a difference on Lennox systems in San Antonio: video inspection cameras to document what’s inside your ducts, duct sealing materials (mastic and aerosol where appropriate), and flex duct repair supplies for the sagging runs we find in older homes.
See the difference
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After
Before
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Before
AfterLennox Service Pricing in San Antonio
Most Lennox Air Duct Cleaning - San Antonio jobs run between $450 and $850 for a typical single-system home, depending on the number of returns, accessibility of the air handler, and how heavily loaded the ducts are. A full system with a contaminated coil and blower wheel will run higher. That’s the honest range. We don’t quote a teaser price on the phone and then “discover” problems once we’re in the attic. The price we hand you in writing is the price you pay. Every time.
| Service | Typical Price Range |
|---|---|
| Standard Lennox duct cleaning (single system, up to 12 supply runs) | $450 – $650 |
| Duct cleaning plus evaporator coil and blower wheel cleaning | $650 – $850 |
| Flex duct repair or replacement (per run, includes mastic sealing) | $120 – $280 |
| Video inspection and written report (credited toward cleaning if booked) | $95 |
| Duct sealing package (varies by system size and leak area) | $350 – $700 |
Your free estimate includes a system walkthrough, a written quote before any work starts, and a straight answer about what actually needs cleaning versus what can wait. Call (254) 347-3897 and we’ll set it up.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 San Antonio
Most Lennox systems in San Antonio should have ducts cleaned every 2 to 3 years, compared to the national average of 3 to 5 years. The reason is local: caliche dust from our limestone soil and juniper pollen from the Hill Country load filters and coat ducts faster than in most Texas cities. If you have a variable-speed Lennox unit, the longer runtimes circulate more of that fine material through the system. Homes with pets or pier-and-beam crawlspaces should lean toward the 2-year mark. Call (254) 347-3897 and we’ll help you figure out where your system falls.
That code means the communicating system has detected a restriction downstream of the filter, not the filter itself. In San Antonio, the usual culprits are collapsed or sagging flex duct, return ducts coated with caliche dust and pollen residue, or a blower wheel that’s accumulated so much fine dust it can’t move rated airflow. The thermostat and blower motor are usually fine. A video inspection will pinpoint the restriction. Call (254) 347-3897 for a diagnostic visit.
Yes, but with a caveat. Cedar fever in San Antonio is triggered by Ashe juniper pollen, which enters your home through return air and gaps in the duct system. If your Lennox system has a high-MERV filter, it traps pollen at the filter. If the return ducts are leaky and the filter is loading too quickly, pollen bypasses the filter and recirculates through the supply side. Cleaning the ducts removes what’s already there, and sealing the return path keeps new pollen from entering. Both are standard parts of our Lennox duct service in San Antonio.
Often, yes. Original 1990s flex duct in San Antonio homes has typically sagged, separated at the collars, or been chewed by rodents in crawlspaces. Cleaning that material is a temporary fix at best. We’ll tell you plainly if replacement is the right call. New R-8 insulated flex duct with mastic-sealed joints costs more upfront, but it solves the airflow and contamination problem permanently. Call (254) 347-3897 and we’ll inspect your ductwork before you spend money on cleaning.
That white dust is caliche dust, extremely fine limestone particulate that leaches from the shallow limestone shelf under San Antonio’s older neighborhoods. It enters your duct system through crawlspace returns and gaps in the return path. A properly sealed and cleaned system stops that dust at the filter. If you’re seeing white dust settle on furniture within a day of cleaning, the return path is compromised and cleaning the supply side alone won’t fix it. Call (254) 347-3897 for a free estimate. Omar will give you a straight answer about what’s actually leaking.
Service Areas Near San Antonio
We provide Lennox duct cleaning across the greater San Antonio area including San Antonio service area coverage inside Loop 410 and on the far west and north sides. We also run Lennox service in New Braunfels for Hill Country homes dealing with cedar pollen loading, and Lennox service in Cibolo for newer construction with undersized return paths. Converse, Terrell Hills, and Timberwood Park are all in our regular rotation as well.
Book Your Lennox Service in San Antonio Today
Ready to find out what’s actually inside your Lennox ducts? Call (254) 347-3897 for a free estimate. A live person answers. You’ll get a straight answer, a written price, and a real appointment window. Clean ducts, straight answers, real price. That’s the whole pitch.
Written by Omar Haddad, Owner at Cardinal Air Duct San Antonio, serving San Antonio since 2005.