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 San Carlos, CA
San Carlos Air Duct Cleaning for Lennox systems typically runs $450 – $900 for a full system, depending on duct count and crawlspace access. We’re an independent Lennox service provider, not manufacturer-authorized, and we say so up front. What makes our Lennox work different here is simple: we actually get into the shallow crawlspaces under the 1940s – 1960s flats east of El Camino and off Laurel Street, where the return plenums live, and we clean them on our backs with headlamps. Call (866) 528-3938 for a free estimate.
Why San Carlos Residents Choose Us for Lennox Service
Lennox systems have their own quirks, and we’ve learned them by working on them every week across San Carlos. The Merit Series G50 and G60 furnaces still heating post-war ranches have cabinet seams and knockouts that leak return air into crawlspaces. The Elite and Signature air handlers use slab-style evaporator coils that load up with fine dust differently than other brands. If you want someone who knows these systems, we’re the crew.
Dave Hanson, our owner, grew up watching his father run a small appliance repair shop out of the family garage in Mountain View, then did the HVAC program at Foothill College and spent the next two decades doing duct work across Santa Clara County. He built the company around methodical negative-pressure cleaning, the kind that pulls debris out instead of just loosening it. Clean air isn’t a feeling, it’s what’s left after the debris is out.
We also happen to know San Carlos. The housing stock here, mostly ranch and rambler homes on small flatland lots with hillside places climbing toward the Santa Cruz Mountains, means forced-air systems that sit idle much of the year. Ducts that sit idle collect things. We know what collects in them here.
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 San Carlos
- Musty smell when the heat first kicks on. The return-air plenums on Merit-series furnaces in low-crawlspace San Carlos flats collect decades of dust and rodent debris from the nearby hills. The shallow cabinet footprint means the return drop is short and easy to starve. We pull the return grille, get into the plenum, and remove what’s accumulated.
- Return air leaking from the factory cabinet. Older G-series Lennox units have seams and knockouts that loosen over time and pull crawlspace air straight across the evaporator coil. That’s dust, spider webs, and whatever else is under the house going right into your air. We reseat and seal those cabinet seams as part of the job.
- Reduced airflow by late summer. The dry-season wildland edges around San Carlos produce fine dust and ash that loads up Lennox slab-style evaporator coils in Elite and Signature air handlers. By August, the coil face is matted and wet, and airflow drops. We clean the coil, not just the ducts.
- Static pressure problems after a remodel. Mismatched old trunk-and-branch sheet metal feeding a newer Lennox air handler after a kitchen addition, often taped and bag-patched, makes the blower and heat exchanger run dirty. We find these cobbled returns and seal them properly with mastic.
- Rodent debris in the return plenum. The hills around San Carlos push rodents down into the flatlands, and the return plenums under low-clearance crawlspaces are where they nest. We remove it, video-inspect it, and tell you what we found.
Lennox Service in San Carlos: What Local Conditions Mean for Your Equipment
Here’s the thing about San Carlos that changes how Lennox duct work plays out here. The crawlspaces under the older flats east of El Camino and along Laurel Street are shallow enough that techs work on their backs with headlamps. That’s not a detail, it’s the whole job. The return trunks under those homes are low, short drops that connect the furnace cabinet to the crawlspace air. When a kitchen gets added to a 1950s ranch, which happens constantly in this city, the return trunk gets cut and rerouted, and the patch job is usually plastic bags and duct tape. That patch leaks. It pulls crawlspace air, construction fallout from the tear-down next door, and decades of dust straight into the Lennox furnace and across the coil. We see this on job after job in San Carlos, and on Lennox repair in Redwood City, because the remodel cycle here is relentless, and the original sheet-metal trunk-and-branch ductwork from the 1940s – 1970s doesn’t always get replaced when the rest of the house does. What it means for Lennox owners is that the system tries to move air through ductwork that was never designed for it. Static pressure climbs, the blower works harder, and the heat exchanger runs dirty. Cleaning the ducts helps, but sealing the cobbled return is what actually fixes the problem. That’s what we do.
Lennox Models & Products We Service in San Carlos
We work on the full Lennox lineup here: Merit Series G50 and G60 gas furnaces, Elite Series EL and EB furnaces and air handlers, and Signature Collection variable-capacity furnaces paired with XC-series condensers. The Dave Lennox Signature Collection air handlers show up a lot in remodel-era replacements where the homeowner kept the original ductwork, which creates the mismatched setups we just described.
When fit matters, we use OEM Lennox filters, gaskets, and coil components. Where the ductwork is concerned, quality aftermarket flex duct, mastic, and sealing materials do the job. On older Merit-series furnaces, we’ll tell you straight when a sealed and cleaned system is worth keeping versus when a rusted heat exchanger or failing blower means replacement makes more sense than repair. We’re not here to sell you a new furnace. We’re here to make the one you have work properly.
For Lennox sales & service across the broader area, see our Lennox service page.
See the difference
Before
After
Before
After
Before
AfterLennox Service Pricing in San Carlos
| Service | Typical Range |
|---|---|
| Full duct system cleaning (single Lennox furnace/air handler) | $450 – $900 |
| Return duct cleaning only | $150 – $300 |
| Evaporator coil cleaning (Elite/Signature slab coil) | $200 – $400 |
| Video inspection of return plenum | $75 – $150 |
| Crawlspace return sealing (mastic, not tape) | $300 – $600 |
What drives the cost in San Carlos is crawlspace access. The shallower the crawlspace, the longer the job takes, and the more careful we have to be. A hillside home with a clean, accessible foundation will be faster than a flatland ranch with a 24-inch crawlspace. Your free estimate includes a walk-through of the duct system, a look at the return plenum, and a straight answer about whether cleaning alone will fix your airflow or whether there’s sealing work that needs to happen. Call (866) 528-3938 to schedule one.
Serving San Carlos, CA – Our Local Coverage Area
We’re based in the San Carlos area and know this community well, and we also handle Lennox repair in Woodside. Use the map below to see our service coverage – if you’re nearby, we can almost certainly help.
FAQs – Lennox Air Duct Cleaning in San Carlos
Yes, almost always. What you’re smelling is accumulated dust and rodent debris in the return plenum heating up for the first time in months. San Carlos’s mild climate means the furnace sits idle from spring through fall while that debris builds up. The return duct under a low crawlspace is the collection point, so it’s the first thing we inspect.
Duct cleaning removes what’s inside the duct. It won’t fix a structural patch. What we do in San Carlos is both: we clean the return and then seal those cobbled patches with mastic and proper materials. The plastic-bag-and-tape patches are common here because of the constant remodel cycle on older homes. If you see one, call (866) 528-3938 and we’ll tell you what’s involved.
It needs the same negative-pressure cleaning, but the coil matters more. The Signature systems use slab-style evaporator coils that load up with fine dust faster than older coil designs, especially during San Carlos’s dry summer months. On a variable-capacity system, we’re careful about static pressure and spend extra time on the coil and blower assembly.
Every 3 to 5 years for most San Carlos homes. The dry climate and wildland edges mean fine dust and ash find their way into the return even when the furnace isn’t running. If you’ve had remodel work done, especially a kitchen addition where the return was rerouted, sooner. If you’re not sure, we’ll video-inspect it and show you what’s in there before quoting anything.
Yes, and we do it as part of most Lennox duct cleaning jobs in San Carlos. The coil is where the airflow problem actually lives, especially by late summer when dust and ash have had months to accumulate. A duct cleaning that skips the coil leaves the most important surface dirty. Call (866) 528-3938 and we’ll inspect yours first.
Service Areas Near San Carlos
Based in Mountain View, we work throughout San Carlos and the surrounding Peninsula. Regular Lennox service calls take us north to San Carlos service area coverage zones and south through Redwood City. We’re also frequently scheduled for Lennox service in Mountain View and Lennox service in Palo Alto, plus Cupertino, Los Altos, and Campbell.
Book Your Lennox Service in San Carlos Today
We’ll get into your crawlspace, show you what’s actually in your ducts, and fix what needs fixing. Call (866) 528-3938 for a free estimate, or to schedule a video inspection of your Lennox return plenum in San Carlos.
Written by Dave Hanson, Owner at Duct Cleaning Mountain View, serving San Carlos and the Peninsula with professional-grade Rotobrush and Nikro equipment and HEPA containment.