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 Covina, CA
We provide independent Lennox air duct cleaning across Covina’s 91722, 91723, and 91724 ZIP codes, working on everything from original 1960s Merit furnaces to newer Elite and Signature Collection systems. What makes our Lennox work different here comes down to Covina’s housing stock: most of these homes are post-war tract builds with original metal trunk lines buried under settled attic insulation. That changes how the job gets done. Call (877) 693-6770 for a straight assessment.
We’re not a Lennox dealer and we don’t pretend to be. We’re an independent shop that services the entire Lennox air path, return plenum to evaporator coil, without steering you toward warranty-covered part swaps a dealer might prefer. For over a decade, our team has specialized in air duct cleaning and repair across the San Gabriel Valley. Alan Merritt, our owner, learned HVAC fundamentals and sheet metal fabrication at Mt. San Antonio College in Walnut, about four miles up Grand Avenue from Covina. He’s spent the years since getting into thousands of attics across this valley, and he’ll tell you straight if your ducts don’t actually need cleaning yet.
Why Covina Residents Choose Us for Lennox Service
Most duct cleaning companies show up with a shop-vac and a logo. We show up with Rotobrush rotary brush systems and Nikro HEPA-filtered vacuums, the same equipment commercial and remediation contractors run. That distinction matters when you’re dealing with a Lennox air handler that’s been pulling citrus-era dust through leaky return ducts for four decades. We also provide Lennox service in Charter Oak with the same commercial-grade equipment.
We also work with Honeywell and Aprilaire whole-home air quality systems, which means we understand how your Lennox equipment interacts with filtration and humidity control, not just duct surfaces. If the air moving through your home is dirty, it doesn’t matter how well you clean the surfaces. That’s the lens we bring to every Lennox job in Covina.
Alan has lived in Diamond Bar since the early 1990s, not far from Sycamore Canyon Park. His youngest daughter has asthma, which is what pushed him toward this specialty in the first place. Improving indoor air quality stopped being a job description and became something he actually cares about getting right. When we inspect a Lennox system in Covina, we’re looking at it the way we’d look at our own.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
Common Lennox Air Duct Cleaning Problems We Solve in Covina
- Blower wheels caked with grove dust and dog hair. Lennox Merit and Elite air handlers with PSC or variable-speed blowers pull particulate from return ducts constantly. In Covina’s dry climate, that dust accumulates on the blower wheel until it goes out of balance, airflow drops, and the system short-cycles. The filter often looks clean because the bypass is happening at leaky return joints, not through the filter.
- Original sheet-metal trunk lines with dried, split mastic joints. 1950s through 1970s tract homes in Covina were built with taped or mastic-sealed metal ducting. Fifty years of Santa Ana heat cycles dry that sealant until it cracks. Return-side leaks then pull attic grit and settled blown-in insulation directly into the airstream. Your Lennox air handler becomes a vacuum for whatever’s in your attic.
- Matted Lennox evaporator coils from dry San Gabriel Valley dust. Older slab-style Lennox coils foul with dust and pollen long before any mold appears. In this dry climate, a dirty coil plus a dirty blower cuts capacity exactly when May through October AC demand peaks. Homeowners feel it as weak cooling and rising summer bills.
- Sagging early flex runs off Lennox plenums. Low-pitch Covina attics leave little room for proper flex duct support. Runs sag, kink, or lose their inner liner over settled insulation. The result: condensation at registers during winter marine-layer damp and reduced flow to far rooms. This is a duct problem that reads like an AC problem.
- Decades of citrus-belt dust packed into return registers. Near downtown and throughout 91722, we routinely find registers packed with grove dust that settled decades ago, back when these blocks were still citrus groves transitioning to suburbia. That legacy particulate keeps circulating through Lennox systems every time the blower kicks on.
Lennox Service in Covina: What Local Conditions Mean for Your Equipment
On Covina’s older citrus-belt blocks in 91722 and near downtown, attic scuttles are often barely two feet wide and the original metal trunk sits buried under settled blown-in insulation. Our Lennox jobs here start with a video inspection and a careful crawl rather than a standard drop-in cleaning. That tight-scuttle, buried-trunk setup is rare in newer Glendora or Inland Empire construction, where attics and duct layouts are far more accessible. For a Lennox owner in Covina, this means the company you hire needs to actually get into that attic and see the ductwork, not run a hose through a register and call it done. We’ve spent years navigating exactly these attics. If you need Citrus Lennox service, we bring that same careful approach. On a 1962 ranch off the older citrus-belt blocks near downtown Covina, a homeowner’s Lennox Merit air handler was short-cycling and the back bedrooms never cooled. Our tech squeezed through a roughly two-foot attic scuttle, found the original metal trunk buried under settled blown-in insulation with split mastic joints, and pulled decades of grove dust and dog hair from the packed return registers. We video-inspected the runs, sealed the trunk joints, cleaned the matted Lennox evaporator coil and blower wheel, and the far rooms came back to full airflow.
Lennox Models & Products We Service in Covina
We work on Lennox Merit Series furnaces and air handlers, including the G50 and G60-era gas furnaces still common in Covina’s post-war homes. We also service Lennox Elite Series variable-speed air handlers, Dave Lennox Signature Collection systems like the SL280 and XC series, and 13ACX or XC13 air conditioners paired with Merit coils. Our parts approach is straightforward: OEM Lennox parts where fit and safety matter, blower wheels, limit switches, coil components. Quality aftermarket for generic items like flex duct, mastic, and vent caps. If your Lennox system’s heat exchanger or coil is sound, cleaning and sealing is usually the right call. If it’s cracked or failing, we say so plainly instead of cleaning around a terminal problem. We also provide full system cleaning, evaporator coil cleaning, and duct sealing, so your cleaned ducts don’t re-contaminate from leaks above.
See the difference
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After
Before
After
Before
AfterLennox Service Pricing in Covina
Lennox air duct cleaning in Covina typically runs between $450 and $900 for a full system depending on home size, number of returns, and how much buildup has accumulated over the decades. Older homes in 91722 with extensive metal trunk lines and multiple returns tend toward the higher end, while smaller 1980s-90s infill homes with simpler flex layouts often land lower. For West Covina Lennox service, pricing follows similar patterns based on home age and duct complexity. Evaporator coil cleaning adds $150 to $300 when the coil is accessible enough to clean in place. Duct sealing runs $350 to $800 depending on how many joints need mastic work and how accessible the attic is. Every estimate includes a video inspection of your duct runs so you can see exactly what’s in there before we touch anything. We quote one flat price per system, agreed before work starts. Call (877) 693-6770 for an exact quote, estimates are free.
Serving Covina, CA – Our Local Coverage Area
We’re based in the Covina 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 Covina
Yes, metal trunk-and-branch ducting from that era is actually very cleanable with rotary brush systems sized for the job, and we access what we need through existing scuttles and registers without opening walls or ceilings. The tight two-foot scuttles common in Covina’s 91722 blocks require a more careful approach, but we’ve done hundreds of these. We’ll video-inspect before and after so you can verify the work. Call (877) 693-6770 to schedule an inspection.
Because the dust isn’t coming through the filter, it’s bypassing it. Split mastic joints and dried tape on original Covina ductwork let attic air and settled insulation get pulled into the return side, straight into your blower wheel and coil. The filter catches what comes through the return registers, but leaky ducts introduce particulate downstream of the filter entirely. Sealing those leaks is the fix.
In Covina’s dry climate, the answer is almost always no. What we find in local Lennox systems is decades of dry grove dust, pollen, and grit from Santa Ana winds, not mold. Mold needs sustained moisture, which Covina’s hot, dry summers don’t provide. Winter marine-layer damp can cause condensation at registers, but the buildup inside these ducts is overwhelmingly dry particulate. If we do see moisture damage, we’ll show you the video and recommend the right path.
In Covina’s older single-story ranches, it’s usually a duct problem. Sagging flex runs, kinked sections, or collapsed liners off the plenum reduce airflow to far rooms even when the AC itself is fine. We check the whole air path, not just the equipment. If the blower and coil are clean and airflow is still weak at far registers, the ducts are the culprit. Call (877) 693-6770 and we’ll diagnose it properly.
Yes, condensation at registers during winter damp periods typically points to compromised flex liner or poor insulation contact where runs pass through unconditioned attic space. We inspect those runs, identify where the thermal barrier failed, and repair or replace the flex section as needed. It’s a repair job, not just a cleaning job. Call (877) 693-6770 for a free estimate on the fix.
Service Areas Near Covina
In addition to Covina service area coverage, our team handles Lennox duct cleaning in Diamond Bar, Valinda, South San Jose Hills, Duarte, and Charter Oak. If you’re nearby and looking for Lennox service in Diamond Bar or Lennox service in Valinda, we cover those communities with the same equipment and the same straight talk. We’re also the region’s Lennox sales & service reference for independent, non-dealer work on existing systems.
Book Your Lennox Service in Covina Today
If your Lennox system is moving air through ducts that haven’t been properly inspected in years, let’s get in there and see what’s actually going on. Call (877) 693-6770 for a free estimate and a video inspection of your ductwork. We serve all of Covina, 91722 through 91724, with the equipment and experience this housing stock demands. We also handle Lennox repair in South San Jose Hills. Clean ducts. Repaired ducts. The difference matters.
Written by Alan Merritt, Owner at Duct Cleaning Diamond Bar, serving Covina and the San Gabriel Valley since 2015.