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
AfterWhy Los Angeles Homeowners Choose Lennox Air Duct Cleaning
Lennox air duct cleaning in Los Angeles isn’t a one-size-fits-all job. The age of your Lennox furnace, the model line it belongs to, and the condition of your ductwork all change how we approach the work. Hollis Air Duct Cleaning provides independent Lennox repair in Los Angeles, including air duct cleaning, coil cleaning, and duct sealing across Los Angeles County. We’re not authorized by or affiliated with Lennox, and we’ll never imply otherwise. What we are is a crew that has spent years working on Lennox systems, from 1990s WhisperHeat furnaces in Silver Lake bungalows to current Dave Lennox Signature Collection units in new builds across the Valley. Call (361) 326-5060 if you want a straight answer about your Lennox system before anyone touches it.
Why Trust Hollis Air Duct Cleaning for Your Lennox Air Duct Cleaning?
Roy Castellanos grew up in Boyle Heights and learned HVAC fundamentals through the sheet metal and air conditioning program at Los Angeles Trade-Technical College. He spent years doing hands-on duct work before starting Hollis Air Duct Cleaning in 2004. That background matters when we open up a Lennox cabinet and find a shrunk factory gasket that’s been pulling attic dust into the return for years. We know what we’re looking at before we touch it.
Our approach to Lennox systems is built on three things. First, we stock Lennox-specific gaskets, transition collars, and panel hardware locally, so most duct cleaning and sealing jobs don’t stall waiting on factory parts. Second, we write the price down before any work starts. No per-vent surprises, no numbers that move once the technician is inside your home. Third, every job carries the 365-Day Done Right Promise in writing. If the work fails within a year, we come back and make it right at no charge. That includes a free second visit, not a begrudging one. Clean ducts, straight answers – that’s the whole job.
We’re part of the Garrison Partners family, and every one of our independently owned locations runs on The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, and leave the site clean. Those aren’t adjectives. They’re the operating rules our uniformed, background-checked technicians follow on every Lennox job in Los Angeles.
Common Lennox Air Duct Cleaning Problems We Fix in Los Angeles
Lennox builds good equipment, but Lennox service in Long Beach and Los Angeles conditions do specific things to it. Here’s what we see most often when we inspect and clean Lennox systems across the city.
- Cabinet panel air leaks on Dave Lennox Signature Collection and Elite Series furnaces. Models like the SL280V, SL297NV, and EL296V ship with adhesive-backed gaskets around the blower access panel and filter door. After enough Los Angeles heat cycles, those gaskets shrink, harden, and peel. The result is air being pulled in around the cabinet seams instead of through the return duct. That unfiltered air brings whatever is floating around your attic or utility closet directly into the blower. We check panel gaskets on every Lennox cleaning and replace them with OEM stock where needed.
- Disconnected or collapsed flex duct at the plenum collar. Older Lennox installations across Los Angeles, especially in 1950s and 60s San Fernando Valley ranch homes, used flexible duct runs that were never properly secured at the air handler collar. Over time the duct slips off or sags. The system starts pulling attic insulation and dust directly into the return. The homeowner notices dust on the ceilings and a blower that runs constantly. We reconnect, mastic-seal, and strap the collar properly.
- Rust flakes from secondary heat exchangers on high-efficiency Lennox models. The SL280V and EL296V use a secondary heat exchanger to squeeze efficiency out of the burn cycle. In homes where the furnace has been cycling for a decade or more, that exchanger can begin to corrode. Rust flakes break loose and enter the supply air stream, then coat the evaporator coil. If your Lennox coil inspected dirty with reddish-brown debris, this is often the source. We’ll tell you what we found and whether the exchanger needs a closer look before we clean anything.
- Uneven dust loading on Lennox microchannel evaporator coils. Lennox moved a lot of residential coils to microchannel construction, which packs more surface area into a smaller coil. The trade-off is sensitivity. When a return duct leaks, dust loads unevenly across the coil face. Sections of the coil clog while others stay clean, and the system loses capacity without tripping any obvious warning. A proper Lennox coil cleaning restores airflow and lets the coil do its job.
- Legacy WhisperHeat and Complete Heat issues in older Los Angeles homes. We still service Lennox G20 and G24 WhisperHeat furnaces and HM30 Complete Heat units in central LA neighborhoods like Silver Lake and Echo Park. These systems are 25 to 35 years old in many cases. The common problems are deteriorated internal insulation shedding into the airstream, and rusted blower housings. In some cases sealing and cleaning extends the life. In others, we give a straight repair-vs-replace answer and respect the homeowner’s decision either way.
Lennox Parts & Our Repair-vs-Replace Approach
When a Lennox duct cleaning turns into a repair, the parts question comes up. Here’s our answer, put plainly. We use OEM Lennox gaskets, seals, and transition collars whenever they are available. Those are the parts that actually change how the cabinet seals and how air moves. For flex duct, mastic, and strapping, we use high-quality aftermarket products that meet or exceed the original specification. The duct doesn’t know what brand it is. The seal does.
The harder conversation is repair versus replace. If a Lennox furnace has a cracked heat exchanger, that’s a safety issue, not a cleaning issue. We’ll show you the crack on camera and tell you what your options are. If the unit is 12 to 15 years old, replacement may make more sense than repair. If it’s a ten year old EL296V with a failed gasket and a dirty coil, we’ll say so and fix it. No pressure to replace a unit that can be safely sealed and cleaned. Last month we cleaned a 2008 Lennox EL296V in a Van Nuys ranch house where the homeowner complained of dust and climbing summer bills. The return flex duct had separated at the air handler collar. Attic insulation was being pulled into the blower. We reconnected and mastic-sealed the collar, cleaned the blower and coil, and sealed three cabinet panel leaks. Static pressure dropped from 0.9 to 0.62 inches of water column. Airflow improved noticeably. That’s the kind of repair that beats replacing a unit that still has life in it. Call (361) 326-5060 if you want an honest read on your Lennox system.
Our Lennox Service Process – Step by Step
- 1
Diagnosis. We inspect the entire Lennox system, not just the ducts. That means the return plenum, filter, blower, cabinet gaskets, flex duct connections, supply registers, and evaporator coil. We look specifically for the Lennox failure modes we know show up in Los Angeles homes: shrunk panel gaskets, disconnected collars, microchannel coil dust loading, and rust from secondary heat exchangers.
- 2
Cleaning and sealing. We use Rotobrush rotary brush systems and Nikro negative-air machines to clean ducts without pushing debris into your living space. For Lennox systems with cabinet leaks, we replace gaskets and seal panel seams before running the negative-air machine, so we’re not pulling attic dust into the cabinet while we work.
- 3
Testing. After cleaning and sealing, we measure static pressure and airflow. On a Lennox system with repaired cabinet leaks and clean ducts, you should see the static pressure come down. We’ll show you the numbers. If the evaporator coil was the problem, we’ll verify the coil face is clean and airflow across it is even.
- 4
Warranty. Every Lennox job gets the 365-Day Done Right Promise in writing. If something we fixed fails within the year, we return at no charge. That’s not a verbal promise. It’s written on every invoice. If you need to reach us, a live person answers the phone 24/7 at (361) 326-5060.
Lennox Products We Service & Install in Los Angeles
We service and clean the full range of Lennox residential equipment installed across Los Angeles and offer San Diego Lennox service as well. That includes the Dave Lennox Signature Collection (SL280V, SL297NV), the Elite Series (EL296V, EL18XPV heat pump), the Merit Series (ML180, ML14XC1), and legacy units including Complete Heat (HM30) and WhisperHeat (G20/G24). We stock Lennox-specific gaskets, transition collars, and panel hardware for the most common models, so we can complete most Lennox duct cleaning and sealing jobs in a single visit. The sub-services we emphasize on Lennox work are full system cleaning, evaporator coil cleaning, and duct sealing. If your Lennox unit is outside our normal service scope, we’ll tell you that up front before you spend a dollar.
We Also Service These Brands
We’re Lennox specialists, not Lennox exclusives. Our technicians work on Trane and Carrier systems across Los Angeles just as often, including the Trane XV series and Carrier Infinity line. If you have a multi-brand home or you’re comparing systems, we can give you a straight read without pushing one manufacturer over another. The brand matters less than the condition of the ductwork and the quality of the seal.
FAQs – Lennox Air Duct Cleaning Service in Los Angeles
Yes. The rotary brush and negative-air methods we use work on any Lennox residential furnace, including Signature and Elite models. The difference is what we inspect before we start. On high-efficiency Lennox units like the SL280V and EL296V, we check cabinet panel gaskets and secondary heat exchanger condition before running the cleaning equipment, because those are the known failure points. Call (361) 326-5060 and we’ll explain what the inspection covers before we schedule anything.
That typically means the return-side ductwork has a leak, a disconnected collar, or a failed cabinet gasket that wasn’t addressed during the previous cleaning. On Lennox systems in Los Angeles attics, the most common culprit is a flex duct that has separated at the air handler collar. The system pulls attic air directly into the blower. A cleaning that skips the return-side inspection will leave you with the same dust problem and a bill for work that didn’t hold up. We inspect and seal the return side before we call the job done.
Yes, and on Lennox microchannel coils it happens faster than on older copper-tube designs. When dust loads unevenly across a microchannel coil, sections of the coil starve for airflow while others overcool. That creates cold spots that can ice up, especially in Los Angeles where systems run constantly during summer heat waves. A proper evaporator coil cleaning restores even airflow across the coil face. If your Lennox system froze up, call (361) 326-5060 so we can inspect the coil before you run it hard again.
We use OEM Lennox gaskets, seals, and transition collars whenever they are available, because the cabinet seal depends on the right material tolerances. For flex duct, mastic, and strapping, we use high-quality aftermarket products that meet or exceed original specifications. You’ll see exactly what parts go into the job on your written invoice.
It depends on the condition of the heat exchanger and the ductwork, not just the age. A 20 year old Lennox G20 or WhisperHeat with a solid heat exchanger and intact ductwork may get more useful years from a proper cleaning and sealing. A 20 year old unit with a corroded secondary heat exchanger and deteriorated internal insulation is probably done. We’ll show you what we find on camera and give you a straight repair-vs-replace answer with real numbers. Call (361) 326-5060 and we’ll schedule the inspection.
For a standard single-system Lennox home in Los Angeles, Fresno Lennox service pricing is similar: full duct cleaning typically runs between $425 and $850 depending on the number of returns, the length of the duct runs, and whether the evaporator coil needs cleaning. Adding duct sealing with mastic and gasket replacement typically adds $250 to $500. Older Lennox systems with disconnected flex collars or heavy coil dust loading will land on the higher end. We give one written price for the whole system before any work starts. No per-vent pricing, no number that changes at the door. Call (361) 326-5060 for an exact quote on your Lennox system.
Book Your Lennox Service in Los Angeles, CA
If your Lennox system is pushing dust, running harder than it used to, or you simply haven’t had the ducts inspected in years, call Hollis Air Duct Cleaning at (361) 326-5060. We’ll schedule a time, show up inside the window, and give you a written price before any work starts. Your call will be answered by a live person. Estimates are free.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Los Angeles since 2004.