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.
Before
After
Before
After
Before
AfterLennox Air Duct Cleaning in Houston, CA | Hollis Air Duct Cleaning
We clean and repair Lennox ductwork across Houston, and the short answer is this: we’re an independent Lennox service provider, not a factory-authorized shop, and the work we do here is shaped by one thing most national pages miss. Houston’s AC systems run nine to ten months a year and stay wet inside. That means Air Duct Cleaning - Houston is as much about mold and moisture as it is about dust. If you own a Lennox system in a slab-on-grade ranch or a two-story with attic flex ducts, call (361) 326-5060 and we’ll tell you what’s actually happening before we touch anything.
Our crews have worked on Merit, Elite, and Dave Lennox Signature systems across Houston’s 1970s through 2000s housing stock for years. We know how these machines behave in a Gulf Coast attic, not just on a spec sheet. And every job gets a written price before work starts, backed by our 365-Day Done Right Promise. Roy Castellanos, our owner, came up through the mechanical trades in Los Angeles County and built Hollis Air Duct Cleaning on one principle: leave the system cleaner than you found it, no upsells, no guesswork. We also offer our Dryer Vent Cleaning in Houston.
Why Houston Residents Choose Us for Lennox Service
Lennox builds good equipment, but the way a Merit Series air handler behaves in a Houston attic has little to do with how it was designed in a test lab. We’ve pulled apart enough Lennox cabinets in this city to know where the water collects, where the flex duct sweats, and where the mold starts. Roy Castellanos trained in HVAC fundamentals at Los Angeles Trade-Technical College and spent years doing hands-on duct work before starting Hollis. That background means when we open a Lennox air handler in a 1990s Houston two-story, we know what we’re looking at.
We keep Lennox OEM coils, pans, and control parts in our local stock rotation when they’re cost-effective, and we use quality aftermarket flex duct, mastic, and insulation where OEM adds no benefit. For Lennox systems under 12 years old with a sound compressor and heat exchanger, repair and re-seal is usually the right call. For older Merit units with rusted cabinets and failing coils in a hot, humid Houston attic, we’ll tell you straight when replacement beats another repair. Written price first. Background-checked, uniformed technicians. Phones answered by a live person around the clock.
You can also see how we handle Lennox work across our other service regions on our Lennox sales & service page, or check the full Houston service area we cover.
Common Lennox Air Duct Cleaning Problems We Solve in Houston
- Condensate pan cracks and clogged drain lines. Lennox Merit and Elite air handlers installed in Houston attics develop pan cracks that send water into the supply plenum and flex duct runs. In this climate, mold colonizes within one cooling season. We find this on video inspection more often than homeowners expect.
- Undersized return-air plenums pulling attic debris. Lennox horizontal attic furnaces from the 1990s and 2000s often have return plenums too small for the blower. The negative pressure pulls attic insulation, dust, and fiberglass into the cabinet, coating the blower wheel and evaporator coil with a mat of debris that recontaminates ducts right after cleaning.
- Variable-speed systems running wet coils too long. Lennox Signature and Elite variable-speed units run long, low-capacity cycles during Houston’s 9 to 10 month cooling season. Great for even temperatures, but the extended wet coil time accelerates biological growth on coil fins and inside downstream flex duct.
- Flex duct sweating through its vapor barrier. R-4 and R-6 insulated flex duct at the trunk and boot connections sweats through the jacket in Gulf humidity. The vapor barrier delaminates and fiberglass gets exposed inside the duct. We routinely find this on video inspection in 1990s and 2000s Houston homes.
- Post-storm water intrusion. After a hurricane or tropical storm, water can enter the Lennox air handler and flex duct at the return plenum or attic penetrations. In a slab-on-grade Houston ranch, that moisture sits and grows mold within days. This is a different scope than routine cleaning, and it’s a call we know well.
Lennox Service in Houston: What Local Conditions Mean for Your Equipment
Houston’s post-hurricane reality changes the first question homeowners ask us. After a tropical storm or flood, the call isn’t “are my ducts dirty.” It’s “did water get into my Lennox system.” That’s the Houston-specific service call you won’t hear in Dallas or Austin. A wet Lennox air handler in a slab-on-grade ranch home here grows mold inside the cabinet and through the flex duct within days. Summer dew points in the mid-70s mean condensation forms inside ductwork every time the AC cycles off, and the mild winters never dry the system out. The attic bakes and sweats all year. So when we open a Lennox unit in the Meyerland area or anywhere else across Houston, we’re looking for water first and dust second. That’s the difference between cleaning and remediation, and it changes the scope, the equipment we bring, and the price we quote.
In a 1998 two-story in the Meyerland area, a homeowner called after a tropical storm because the Lennox Elite air handler in the attic had taken on water at the return plenum. Our video inspection showed standing moisture and dark growth inside 40 feet of R-4 flex duct downstream. We pulled and replaced the saturated flex runs, cleaned and treated the Lennox evaporator coil and blower, and mastic-sealed the plenum connections so the system could dry out and run clean through the rest of the cooling season.
Lennox Models & Products We Service in Houston
We work on the full residential Lennox lineup in Houston. That includes the Merit Series, like the ML14XC1 and 14ACX air conditioners with matching furnaces, the Elite Series, including the XC21, EL16XC1, and SL280V furnaces, and the Dave Lennox Signature Collection, like the XC25, SL25XP, and SLP98V. We also handle Lennox CompleteHeat units and the older horizontal attic furnaces common in 1980s and 1990s Houston builds. We use Lennox OEM coils, pans, and control parts when they’re available and cost-effective, and quality aftermarket flex duct, mastic, and insulation where OEM adds nothing. The goal is a system that runs clean and stays clean through a full Houston cooling season.
Lennox Service Pricing in Houston
Routine Lennox air duct cleaning in Houston typically runs $450 to $900 for a full system, depending on home size, number of returns, and whether the evaporator coil and blower need cleaning too. Flex duct repair or replacement adds $250 to $700 per run. Video inspection runs $150 to $350, and we roll that cost into the job if you proceed with the work. Mold remediation in ducts, which is common after post-storm water intrusion in Houston, runs $800 to $1,800 depending on how far the growth spread. Every quote is written before we touch the system, and it doesn’t move at the door. Call (361) 326-5060 for a free estimate on your exact Lennox setup.
Serving Houston, TX - Our Local Coverage Area
We’re based in the Houston 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 Houston
Yes, and it usually already has. A water stain on the ceiling below a Lennox attic air handler means the condensate pan has overflowed or cracked, and water has pooled around the return or supply plenum. In Houston’s humidity, that moisture migrates into flex duct runs within days. The fix is not just duct cleaning. We inspect the pan, clear or replace the drain line, dry and treat any affected duct, and mastic-seal the plenum connections. Call (361) 326-5060 and we’ll look before we quote.
In Houston, every 3 to 5 years for most Lennox homes, and every 2 to 3 years if you have older R-4 flex duct, pets, or a Lennox air handler that has already had a condensate problem. The reason is biological, not just dust. Houston’s AC systems run 9 to 10 months a year and stay wet, so mold activity never fully stops. If you can see dust or dark staining around the supply registers, or the vents smell musty when the AC kicks on, it’s time. Call (361) 326-5060 for an honest take on whether you need it now or can wait.
No. Duct cleaning and coil cleaning do not void a Lennox warranty, and the work we do uses equipment and methods consistent with Lennox’s published maintenance requirements. We are an independent service provider, not a factory-authorized shop, which means we are not bound by a dealer agreement to sell parts or upsell components. We use Lennox OEM parts when they’re cost-effective and quality aftermarket materials where they’re not. If you’re concerned about a specific warranty term, we’ll walk you through it before we start. Call (361) 326-5060.
In Houston, that smell almost always means the flex duct vapor barrier has failed and condensation is sitting inside the insulation. Gulf humidity works its way through R-4 or R-6 jackets over time, the fiberglass gets damp, and the musty odor gets pushed into your living space every time the blower runs. Sometimes the issue is limited to one run; sometimes the trunk is affected. We find it with video inspection, then replace what’s compromised and seal the connections. Call (361) 326-5060 and we’ll find the source, not just mask it.
You won’t always see it, and that’s the trap. Water can enter a Lennox air handler at the return plenum, fill low points in attic flex duct, and sit there invisible until the musty smell shows up weeks later. In a slab-on-grade Houston home, the equipment cabinet may look dry at the access panel while the insulation and duct interior are wet. We run a video inspection to see inside the cabinet, plenum, and every run, and we tell you exactly what’s wet, what needs drying, and what needs replacing. Call (361) 326-5060 for a post-storm inspection before mold gets a permanent foothold.
Service Areas Near Houston
Hollis Air Duct Cleaning serves Houston and the surrounding communities from our independent locations. If you’re outside the immediate Houston metro, we’ve got crews covering other territories too. You can check our Lennox service in Queens page or our Lennox service in Manhattan page to see how we handle the same Lennox work in those regions. Each location runs on The Garrison Standard, so the written price, the background-checked crew, and the 365-Day Done Right Promise stay the same.
Book Your Lennox Service in Houston Today
We’ll give you a straight answer on what your Lennox system needs, a written price before we start, and a full year of coverage on the work. Clean ducts, straight answers, that’s the whole job. Call (361) 326-5060 for a free estimate.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Houston since 2004.