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.
Lennox Air Duct Cleaning in San Mateo, CA
We provide independent Lennox air duct cleaning across San Mateo, from downtown bungalows in 94401 to 1960s tract homes near Foster City Lennox service areas in 94404. The one thing that separates Lennox duct work here from anywhere else on the Peninsula is the sheer number of modern Lennox furnaces retrofitted onto pre-war duct trunks that were never resized for forced-air airflow. If your Lennox system is pushing air through 80-year-old sheet metal, a standard cleaning won’t fix what’s actually wrong. Call (833) 620-7085 and we’ll tell you what we’re looking at before we touch a duct.
We work on Lennox sales & service equipment daily, from older G-series furnaces to current Merit and Elite systems. We’re an independent provider, not authorized or sponsored by Lennox, and that matters: we assess and document what your system needs without a manufacturer script running in the background.
Why San Mateo Residents Choose Us for Lennox Service
Neal Drummond, our owner, grew up in Palo Alto’s Crescent Park and trained through Foothill College’s HVAC program in Los Altos Hills. He’s been in residential and light-commercial duct work across the Peninsula for over a decade. What that means for a San Mateo Lennox owner is simple: we know how Lennox cabinet airflow, coil placement, and flex-to-metal transitions behave in actual Peninsula homes, not just on paper.
When a Lennox Merit or Elite furnace gets paired with aging San Mateo ductwork, the problems are rarely the furnace itself. The blower is doing its job. The ducts aren’t. We approach every Lennox job here by asking what the duct layout was designed for originally, because in this city, the answer is often “a 1940s gravity furnace, not a modern variable-speed blower.” We carry OEM Lennox parts where control compatibility matters, and quality aftermarket sealing hardware where it meets spec. No improvisation, no guesswork.
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 Mateo
- Musty supply air from sealed Lennox cased coils. San Mateo’s marine humidity cycles push moisture into Lennox air handlers and cased coils that seal tight enough to trap condensation. Homeowners notice the smell before they notice any duct problem. We open the cabinet, inspect the evaporator coil, and clean it properly before addressing the ducts downstream.
- Flex ducts sagging at Lennox plenum takeoffs. Salt-laden Bay air corrodes metal collars faster here than inland. Taped or unsealed takeoffs separate at the collar, pulling attic air and dust into the supply side. We re-secure with mastic and proper fasteners, not another wrap of tape.
- Legacy rigid metal ducts leaking at every joint. The 1920s to 1950s bungalows west of El Camino in San Mateo often run original sheet-metal ducts with joints that pull dust, garage air, and crawlspace debris into the return. A Lennox furnace on this ductwork works twice as hard and delivers half the filtration. We seal and clean in the same visit.
- Undersized return chases choking variable-speed Lennox blowers. Modern Lennox variable-speed air handlers pull more air than 1940s return plenums were built to supply. Static pressure climbs, airflow drops, and homeowners think the blower is failing. It isn’t. The duct is. We measure, document, and resize where needed.
- Soot-lined plenums from retired gravity furnaces. In downtown San Mateo and Hayward Park, we still open floors to find octopus gravity furnace remnants feeding soot into retrofitted Lennox trunks. The duct doesn’t lie. We clean the soot out, not around it.
Lennox Service in San Mateo: What Local Conditions Mean for Your Equipment
Here’s what makes San Mateo different from every neighboring city we work in. In the downtown San Mateo and Hayward Park areas, we routinely find original 1940s octopus gravity furnaces still connected to undersized, soot-lined ducts, often with a later Lennox forced-air unit retrofitted onto the same trunk. That trunk was sized for warm air rising by convection, not for a modern blower pushing 1,200 CFM through a filter. So a Lennox duct job here doesn’t start with a cleaning pass. It starts with a full assessment of a century-old duct layout. We’ve opened returns in 94402 where the metal was so undersized for the Lennox air handler that the blower was effectively dead-heading against a wall of static pressure. The homeowner had been told the furnace was failing. It wasn’t. The original duct design simply never anticipated a Lennox variable-speed blower.
Add San Mateo’s marine air to that picture. Cool summers and wet winters mean HVAC systems run less than they do inland, but humidity cycles and high-wind events push dust, pollen, and moisture into those aging metal ducts. Salt-laden air accelerates corrosion on collars and plenums. Spring cleaning and post-winter mold checks are the local rhythm here, not just a generic “annual service” checkbox. For Lennox service in Woodside and throughout the area, we see similar retrofit issues. On a Hayward Park block off 9th Avenue, we opened a 1940s bungalow where a Lennox Elite furnace had been retrofitted onto the original undersized trunk, and the return was pulling soot-laden air from a sealed-off gravity-furnace plenum. We ran video inspection, mastic-sealed the legacy metal joints, resized the return takeoff, and cleaned the Lennox cased coil. Supply static dropped and the musty smell cleared within a day. That’s what a San Mateo Lennox job actually looks like.
Lennox Models & Products We Service in San Mateo
We work on the full Lennox residential range: Merit Series furnaces (ML and EL lines), Elite Series gas furnaces and air handlers, Dave Lennox Signature Collection SLP and SL high-efficiency furnaces, and XC, XC21, and XC25 variable-capacity air conditioners paired with matching air handlers. On the parts side, we use OEM Lennox components for blower motors, control boards, and igniters, where fit and communication with the system matter. For gaskets, mastic, flex runs, and sealing hardware, we use quality aftermarket where it meets spec. If a legacy Lennox furnace or coil in San Mateo is beyond economic repair, we say so directly rather than patching a system that can’t support proper filtration. We’d rather tell you the truth than sell you a cleaning that won’t hold.
See the difference
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After
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AfterLennox Service Pricing in San Mateo
Lennox air duct cleaning in San Mateo typically falls between $450 and $1,100 for a full single-system residential job, depending on the home’s age, duct material, and whether we’re dealing with legacy metal versus modern flex. A full system cleaning with evaporator coil service usually tracks with the upper end when the house has original sheet-metal ductwork. Duct sealing adds material and labor but prevents the leaks that make cleaning pointless. What drives cost here specifically is the pre-war housing stock: if we’re restoring and sealing legacy ducts in a 1940s bungalow, that’s a different job than cleaning a 1990s flex system versus Belmont Lennox service work. The estimate is free, itemized, and agreed before work starts. Call (833) 620-7085 for an exact number for your system.
Serving San Mateo, CA – Our Local Coverage Area
We’re based in the San Mateo 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 San Mateo
We can clean it, but the real question is whether the duct layout will support your Lennox furnace’s airflow after we’re done. In most San Mateo bungalows with original sheet-metal trunks, the ducts leak at every joint and undersized returns restrict the blower. We clean and seal in the same visit, and if the duct is beyond repair, we tell you before quoting a cleaning job. Call (833) 620-7085 and we’ll assess what you actually have.
Cool marine air doesn’t mean dry air. San Mateo’s humidity cycles condense moisture on Lennox evaporator coils, and sealed cased coils trap it. The musty smell is biological growth you’re smelling, not just stale air. We open the cabinet, clean the coil, and treat the supply side. Call (833) 620-7085 to get the smell traced to its source.
Yes. Salt-laden air accelerates corrosion on metal collars, takeoffs, and plenums faster in San Mateo than any inland Peninsula city. We see flex ducts separated from corroded collars regularly in 94401 and 94402. We replace the collar, not just re-tape the joint. A free inspection will tell you if your collars are failing. Call (833) 620-7085.
We do. Those homes typically have newer Lennox equipment on moderately sized metal or flex duct, but the static-pressure problems come from return chases that were sized for old constant-speed blowers. We measure static pressure, identify the restriction, and clean what’s cleanable while flagging what needs sealing or replacement. Call (833) 620-7085 for an assessment in 94404.
The cleaning should include video inspection of the legacy trunk, removal of soot and debris from the old gravity plenum, mastic-sealing of all accessible metal joints, and verification that the Lennox blower isn’t fighting a duct layout it was never designed for. One flat price for the system, agreed before we start. Call (833) 620-7085 and we’ll walk you through what we found on similar homes in downtown San Mateo.
Service Areas Near San Mateo
We serve San Mateo and the surrounding Peninsula, including San Mateo service area coverage across 94401, 94402, 94404, and 94497. We also work in Menlo Park, Los Altos, Palo Alto, San Carlos, and Woodside. If your Lennox system sits on legacy ductwork anywhere on the mid-Peninsula, we’ll take the call.
Book Your Lennox Service in San Mateo Today
If your Lennox furnace is pushing air through ductwork that predates the blower itself, don’t wait for the musty smell to get worse. We’re thorough, we’re methodical, and we document everything. Call (833) 620-7085 for a free estimate and we’ll schedule your San Mateo assessment.
Written by Neal Drummond, Owner at Air Duct Cleaning Palo Alto, serving San Mateo and the Peninsula with professional-grade duct cleaning, sealing, and repair.