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.
Why San Leandro Homeowners Choose Lennox Air Duct Cleaning
We provide independent Lennox air duct cleaning service in San Leandro, and the honest difference is that we know these systems’ specific failure points, not just how to run a vacuum through a register. If you own a Lennox furnace or air handler in one of San Leandro’s older ranch homes, you’re dealing with ductwork that’s been collecting dust, pest debris, and failing insulation for decades. We show up with Rotobrush and Nikro rigs, not a shop vac and a flashlight.
We’re not a Lennox dealer and we don’t pretend to be. What we are is a San Leandro crew that has pulled apart enough Lennox cabinets to know exactly where they leak, where they clog, and where they hide problems a generic duct cleaner will miss. Your ducts carry every breath your family takes indoors. That’s the only credential that matters. Call (855) 356-5880 for a free estimate. We answer 24/7.
Why Trust Duct Cleaning San Leandro for Your Lennox Air Duct Cleaning?
Sal Underwood, our owner, grew up in the Estudillo Estates neighborhood of San Leandro. He learned HVAC fundamentals through the HVAC/R program at Chabot College in Hayward, then spent well over a decade in the trade before starting this company in 2018. He’s the kind of technician who checks the return vents and the plenum, not just the registers everyone can see. That matters on a Lennox system because so much of what goes wrong with them lives in exactly those hidden spaces.
We know how Lennox equipment behaves in San Leandro’s specific conditions. The marine layer keeps furnaces idle for long stretches, and that’s when dust settles, pests move in, and interior duct lining quietly degrades. Our techs understand how a variable-speed ECM blower masks restriction, how a loose Merit cabinet pulls attic air, and how a plugged case coil chokes airflow before you ever notice a temperature problem. We clean it and fix it. One visit. Clean ducts, sealed repairs, safer dryer vent.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
Common Lennox Air Duct Cleaning Problems We Fix in San Leandro
- Loose Merit Series cabinets and return drops. Builder-grade Lennox furnaces from the 2000s are known for cabinets that don’t seal tightly at the plenum and return drop. In San Leandro’s older tracts, that gap pulls unfiltered attic and garage air straight into the system. The result is dust loading throughout the house that no amount of filter changes fixes. We seal those seams properly, then clean the contamination out of the ductwork itself.
- Plugged evaporator coils on older systems. Lennox slab-style and case-coil evaporator designs hold moisture and shed debris over time. The coil face loads up with matted dust, lint, and sometimes pet hair until airflow drops sharply. The telltale sign is a system that runs constantly but doesn’t cool or heat the way it used to. We clean the coil face and the surrounding cabinet so air moves again.
- Quiet ECM blowers hiding serious restriction. Variable-speed ECM blowers in Signature and Elite furnaces run so quietly that they mask severe duct restriction. A PSC motor gets audibly louder as it fights a dirty coil or collapsed return; an ECM blower just works harder silently until it overheats or throws a fault code. If your filter gets dirty fast but the system sounds fine, restriction is the usual culprit. That’s a duct problem, not a filter problem.
- Failed flex duct at collars and takeoffs. Builder-installed Lennox flex duct often lacks mastic at the collars. After 15-plus years in a San Leandro attic, the tape dries out, the collars separate, and conditioned air dumps into the attic or crawlspace instead of the rooms. You paid to condition that air, and it’s leaking out of the system before it reaches a register. We find these separations with a camera and seal them with mastic that actually holds.
- Degraded interior duct lining in older sheet metal. Many San Leandro homes built in the 1940s through 1970s still run original rigid sheet-metal ducts with failing fiberglass interior lining. That lining breaks down over decades and sheds fibers into the airstream. When you fire up the furnace in fall, that’s what blows into the house. Cleaning removes the loose material, and sealing or repairing the ductwork stops it from getting worse.
Lennox Parts & Our Repair-vs-Replace Approach
We’re practical about parts. For filters, flex duct, mastic, and caps, we use quality aftermarket materials because the difference doesn’t justify the manufacturer markup. What matters is that the duct system stays sealed and the air stays clean. The fit and the workmanship matter more than the label on the tape.
For ECM blowers, control boards, and OEM coil assemblies, we lean on genuine Lennox parts. The electronics and cabinet tolerances are unforgiving, and an aftermarket board that doesn’t communicate properly with a Signature Series furnace is a callback waiting to happen. That said, we don’t stock OEM parts on the shelf, and we won’t claim to. If a 20-year-old Merit furnace shows a cracked heat exchanger, we’ll tell you it’s replacement territory. Selling you a new blower for a compromised cabinet isn’t honest work. Call (855) 356-5880 and we’ll walk through what your system actually needs.
Our Lennox Service Process – Step by Step
- 1
Diagnosis. We start by listening to the system and checking airflow at the return and the registers. On Lennox equipment, we specifically inspect cabinet seams, plenum connections, and coil condition before anything gets cleaned. If there’s a restriction, we find it first.
- 2
Cleaning and repair. We clean the duct runs, coil, and blower with negative-air equipment so debris doesn’t blow into the house. If we find separated flex takeoffs or leaky collars, we seal them on the spot. Same visit, same crew.
- 3
Testing. After cleaning and any repairs, we measure static pressure drop and airflow at the registers. That’s how we confirm the ECM blower isn’t fighting restriction anymore. We don’t call it done until the numbers make sense.
- 4
Warranty-safe work. We document what we did and note anything that needs manufacturer attention. Our work doesn’t void a Lennox equipment warranty because we’re not modifying the equipment itself. A clogged coil cleaned properly doesn’t put your furnace’s warranty at risk.
See the difference
Before
After
Before
After
Before
AfterLennox Products We Service & Install in San Leandro
We work on the full spectrum of Lennox residential equipment in the San Leandro area. That includes Dave Lennox Signature Collection furnaces with variable-speed ECM blowers, Elite Series furnaces and air conditioners, and builder-grade Merit Series equipment that’s now common in our older housing stock. We also service Lennox Balanced Climate and Healthy Climate filtration setups, and we know how to clean around them without compromising an existing whole-home air quality investment.
Our scope covers Full System Cleaning, Evaporator Coil Cleaning, and Duct Sealing. We don’t do industrial or large-commercial HVAC work, but residential and light commercial systems fall squarely within what we handle. If you own a Lennox system in a home or small building in San Leandro, we can make it breathe properly.
We Also Service These Brands
We’re not a single-brand shop. The same Rotobrush and Nikro rigs that clean Lennox ductwork also handle Trane and Carrier systems, and the repair work follows the same logic: find the leak, clean the restriction, seal it right. If your San Leandro home has a different furnace brand, the phone number is the same.
FAQs – Lennox Air Duct Cleaning Service in San Leandro
No. We’re an independent Lennox service provider, and we say so plainly. We’re not Lennox-authorized, and we don’t need to be to clean, inspect, or diagnose one of their systems properly. In fact, independence means we have no incentive to upsell you on manufacturer programs. We’re here to make your ductwork work.
A quiet furnace with a fast-dirtying filter usually means the system is pulling air it shouldn’t be. On Signature Series units, the ECM blower runs so quietly that it masks restriction. The air that bypasses the filter through leaky cabinet seams or separated return drops is exactly what loads your filter and your house with dust. Sealing those leaks and cleaning the ducts fixes the root cause instead of just swapping filters. Call (855) 356-5880 and we’ll find where the air is really coming from.
That depends on what we find. A Merit furnace with a solid heat exchanger and a properly sealed cabinet is absolutely worth cleaning and sealing. The ductwork issues on these systems are fixable. But if we scope the heat exchanger and find cracks, we’ll tell you the truth: that’s replacement territory, not a cleaning job. We won’t sell you ductwork work on a furnace that’s already at the end of its life.
Yes. We work around Honeywell and Aprilaire whole-home air quality equipment regularly, and we treat high-efficiency filtration media with care. The cleaning process uses negative air so we’re not pushing debris through your filtration system. We also check the filter housing and media condition while we’re in there, because a loaded filter on a Healthy Climate setup changes airflow before any cleaning does.
Absolutely. The coil and blower are mechanical components that need cleaning just like any other part of the airflow path. We don’t need dealer status to pull a blower wheel, clean a case coil, or seal a return drop. We need the right equipment and the willingness to do the work correctly. We have both. A homeowner off Washington Avenue with a 2006 Merit furnace had one bedroom that never cooled and constant dust upstairs. Our tech ran video down the trunk and found a half-plugged case coil plus three separated flex takeoffs where the attic heat had dried out the tape. We cleaned the coil and blower, sealed the plenum and collars with mastic, and the static pressure dropped enough that the bedroom finally matched the rest of the house. That’s the kind of thing dealer status has nothing to do with.
The price depends on system size, access, and what we find during the diagnosis. We don’t quote per-vent pricing or bait you with a teaser figure. You get one flat price per system, agreed before work starts, based on a written estimate. If repairs are needed, those get priced separately and you approve them before we touch anything. Estimates are free. Call (855) 356-5880 and we’ll give you real numbers for your system.
Book Your Lennox Service in San Leandro, CA
If you own a Lennox furnace in San Leandro and you can’t remember the last time the ducts were cleaned, that’s usually answer enough. Call (855) 356-5880 for a free estimate. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. Commercial-grade equipment, residential pricing. One visit. Clean ducts, sealed repairs, safer dryer vent.
Written by Sal Underwood, Owner at Duct Cleaning San Leandro, serving San Leandro since 2018.