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 Walnut, CA
We clean and repair Lennox duct systems throughout Walnut, CA. Cobalt Air Duct Cleaning is an independent specialist, which means we know Lennox equipment well but aren’t affiliated with or authorized by the manufacturer. The detail that matters most in Walnut is this: hillside homes near the San Jose Hills have longer, more convoluted duct runs than flatland tracts, and that changes how a Lennox system moves air. Call (866) 596-7835 for a free estimate.
Why Walnut Residents Choose Us for Lennox Service
Most duct cleaning companies treat every system the same. We don’t. Larry Reyna, our owner, has spent the better part of two decades inside ductwork throughout this part of the San Gabriel Valley. He picked up the mechanical side of HVAC through hands-on coursework at Fullerton College, and he still leans on that foundation when a Walnut Lennox system has an airflow problem that isn’t obvious. What we’ve learned in that time is that Lennox equipment installed in 1980s and 1990s Walnut track homes behaves differently than Lennox equipment squeezed into hillside attics. We plan the cleaning around the house, not the other way around. If you’d like a specialist who can explain what’s happening in your ducts before cleaning them, Lennox sales & service is what we focus on.
We use Rotobrush and Nikro systems, commercial-grade equipment that does more than wave a vacuum wand around. And because we also repair ducts, not just clean them, we catch things on a Walnut Lennox job that a cleaning-only crew would mark as done and leave behind.
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 Walnut
These are the failures we see repeatedly in Walnut Lennox homes. Not every house has all of them, but most have at least one.
- Collapsed flex duct inner liners behind knee walls. Two-story homes from Walnut’s 1980s-2000s building surge routinely hide flex duct behind upstairs knee walls. Over 20 to 30 years, the inner liner sags, tears, or collapses. The Lennox blower is still pushing air, but it isn’t reaching the far bedrooms. We find this constantly in Snow Creek and other planned subdivisions.
- Evaporator coil fouling from Santa Ana dust and pollen. Walnut sits directly in the path of Santa Ana winds that push fine grit and pollen east through the San Gabriel Valley. Homes along the 60 freeway corridor get an extra dose. A Lennox evaporator coil coated in that fine dust produces musty odors and weak cooling, even when the compressor is fine. Coil cleaning is part of what we do on nearly every Walnut Lennox job.
- Loose or degraded mastic at metal duct joints in older ranch homes. Walnut’s older ranch stock, the homes built before the big growth spurt, often have sheet-metal ductwork with mastic sealant that’s dried and cracked. Attic air and insulation fibers slip into the supply stream through those joints. Homeowners notice dust that returns days after cleaning, and they’re right to be frustrated. Duct sealing fixes the root cause.
- Blower wheel buildup in Lennox air handlers. High-use households, and Walnut has plenty of them, often stretch filter changes too far. Dust cakes onto the blower wheel, throws it out of balance, and makes the air handler noisy. The fix is cleaning the wheel, not just the ducts.
- Static pressure imbalances in hillside homes. Lennox systems in homes climbing toward the San Jose Hills often push air through longer, more winding duct runs. That raises static pressure, which makes the system work harder and reveals every small leak. We address the ductwork, not just the symptom.
Lennox Service in Walnut: What Local Conditions Mean for Your Equipment
Walnut’s geography creates a split personality for Lennox ductwork. The flatland tracts along the 60 freeway corridor were built fast during the 1980s-2000s expansion, with simple, short duct runs, unlike the longer layouts we see with Lennox in West Puente Valley. The hillside homes near the San Jose Hills are different: longer trunk lines, more elbows, and HVAC equipment wedged into attics or garages. Those hillside Lennox systems run with higher static pressure, which means any small leak is amplified. An eight percent duct leak on a flatland tract might be a minor annoyance. The same leak on a Snow Creek hillside can pull hot attic air into the supply stream and starve upstairs bedrooms. When we clean a Lennox system in Walnut, we look at the duct layout first because it tells us where the problems will be. We also respect Walnut’s HOA-heavy subdivisions and strict code enforcement, so our recommendations account for what’s practical under local neighborhood standards and permitting rules. See what’s actually inside your ducts before deciding what needs to happen next.
Lennox Models & Products We Service in Walnut
We work on the full range of Lennox residential lines common in Walnut homes. That includes the Lennox Merit Series, with the 13ACX and 14ACX condensing units, the Elite Series XC13 and XC14, and the higher-end Signature Collection XC21, SL280, and SLP98 models. For critical components like blower motors and coils, we use OEM Lennox parts when they’re available. For duct fittings, mastic sealants, and flex duct sections, we use high-quality aftermarket equivalents that meet or exceed spec. If you’re trying to decide whether cleaning and repair make sense versus replacing an aging Lennox system, we’ll lay out the honest math. No upselling. We service what’s in front of us and tell you what we’d do if it were our house. Keep in mind this work covers the entire Walnut service area, from 91788 through 91795.
See the difference
Before
After
Before
After
Before
AfterLennox Service Pricing in Walnut
Lennox duct cleaning in Walnut typically runs between $450 and $900 for a full system, depending on home size, number of returns, and whether the coil and blower need cleaning as well. Duct sealing adds $200 to $500 on average, and evaporator coil cleaning on a Lennox system is usually $150 to $350. Homes with two systems, which are common in Walnut’s larger two-story properties, sit at the higher end or beyond. We quote one flat price per system before work begins. That price covers the full scope: cleaning, any minor duct section replacement, mastic sealing where accessible, and before-and-after photos of your ducts. What drives cost most in Walnut is hillside duct complexity. A Snow Creek home with a long attic trunk line takes longer than a flatland tract house with a simple layout. Call (866) 596-7835 for an exact quote, estimates are free.
Serving Walnut, CA – Our Local Coverage Area
We’re based in the Walnut area and know this community well, and we also service Lennox in South San Jose Hills. Use the map below to see our service coverage – if you’re nearby, we can almost certainly help.
FAQs – Lennox Air Duct Cleaning in Walnut
A Lennox system in Walnut struggles in summer because the cooling season is long and the ducts are fighting the heat. When attic temperatures climb above 130 degrees in July and August, any small duct leak pulls superheated air into the supply stream before it ever reaches your registers. Hillside homes with longer duct runs feel this more acutely. If your system cools fine in the evening but can’t keep up from 2 to 6 p.m., the ductwork is a likely contributor. Call (866) 596-7835 and we’ll inspect it.
Santa Ana winds push fine grit, pollen, and sometimes wildfire ash into Walnut from the northeast, and your Lennox return ducts pull that same air through the filter and into the system. In wind season, intake vents along the 60 corridor collect a visible film of dust, similar to what we find on Lennox in Valinda. That dust settles on the blower wheel and evaporator coil. The filter catches a lot, but not everything. If you notice a musty smell from your registers after a wind event, that’s the coil telling you it’s fouled. Addressing it before summer hits makes sense. Call (866) 596-7835 for a free estimate.
Dirty ducts rarely make noise by themselves. A noisy Lennox air handler usually points to a blower wheel caked with dust, which throws it off balance, or to high static pressure from blocked or collapsed duct sections. In Walnut two-story homes, a collapsed flex duct behind a knee wall can create enough resistance to make the blower work harder and whine. We clean the blower wheel and inspect the duct runs at the same time, so the repair actually solves the noise instead of masking it.
Yes. Hillside Lennox homes near the San Jose Hills, like Lennox in Irwindale, often have longer trunk lines with more elbows and connections than flatland tract homes. That means more places for dust to collect and more joints to leak. We pull longer sections of flex duct and spend more time sealing accessible joints on hillside jobs. The cleaning equipment is the same Rotobrush and Nikro gear, but the sequence is different because the failure points are different. A standard one-size-fits-all cleaning misses what’s actually wrong in a hillside attic.
Yes, but it matters what’s being cleaned. In Walnut homes, dust and allergens enter the supply stream through leaking return ducts and fouled coils, not just dirty register boots. A thorough Lennox duct cleaning that includes coil cleaning and duct sealing removes the source rather than just the symptom. That’s why we include before-and-after photos, so you can see what was actually in there. If allergies are the trigger, ask about duct sealing while we’re there. Call (866) 596-7835 for an exact quote, estimates are free.
Service Areas Near Walnut
We serve Walnut and the surrounding San Gabriel Valley communities, including La Habra, Irwindale, Baldwin Park, and Rosemead. Each area has its own housing patterns and Lennox installation quirks, so if you’re nearby, we bring the same specialist approach. We also handle Lennox work in West Whittier-Los Nietos and San Gabriel.
Book Your Lennox Service in Walnut Today
If your Lennox system isn’t moving air like it used to, we’ll find out why. Call (866) 596-7835 to book a free estimate for Lennox air duct cleaning in Walnut. We schedule directly and show up ready to work.
Written by Larry Reyna, Owner at Cobalt Air Duct Cleaning, serving Walnut and the San Gabriel Valley.