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 Foster City, CA
We clean Lennox air duct systems across Foster City and offer San Mateo Lennox service as well. If you own a Lennox furnace, air handler, or heat pump in the 94404 ZIP, we handle the full system: coil, blower cabinet, trunk lines, and branch runs. What makes our work different here is that we scope for slab-level damp and salt-air corrosion on your duct joints before we ever quote a standard cleaning. Call (833) 620-5944 for a straight answer.
This page is for Foster City homeowners who want a Lennox system cleaned by someone who actually knows how these units fail in this specific microclimate. Bruce Lowry, our owner, grew up in Alameda’s West End and spent two decades crawling through Bay Area ductwork. He built Everclear Air Duct Cleaning around one idea: clean air isn’t a feeling, it’s something you can see. We’re an independent Lennox service provider. Not factory-authorized, not affiliated. Just honest about what’s inside your ducts.
Why Foster City Residents Choose Us for Lennox Service
Most duct cleaning companies treat every furnace the same way. We don’t. A Lennox Merit Series furnace mated to original 1960s rigid sheet-metal ducting in Foster City has specific failure patterns. We know them because we’ve opened enough of these systems in this city to recognize the signs before we start vacuuming.
Bruce’s background shapes how we work. He picked up HVAC fundamentals at Laney College in Oakland, where hands-on coursework taught him something simple: the dust doesn’t lie. Either a system was cleaned or it wasn’t. That’s why we show every Foster City customer before-and-after photos of their own ducts. Not stock images. Your actual return vent, your actual coil, your actual trunk lines.
We bring professional-grade Rotobrush rotary brush systems and Nikro HEPA-rated vacuum equipment to every Lennox job. This is the same gear used in commercial and remediation-grade projects. Abatement Technologies negative air and containment setup means the debris we dislodge gets captured at the source, not blown back into your living room. And because we stock Honeywell and Aprilaire filtration products, we can improve your air quality in the same visit. One call covers cleaning, repair, and filtration.
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 Foster City
- Wet insulation and biofilm at the coil-to-plenum transition. Lennox cased coils and drain pans trap condensation in Foster City’s humid marine air. What looks like duct dirt is often microbial growth feeding on perpetually damp insulation. We clean the coil, treat the pan, and replace saturated insulation rather than just wiping the surface.
- Rusted galvanized cabinet seams and corroded blower housings. Original Lennox air handlers from the 1970s and 1980s in Foster City homes pull salt-laden Bay air through undersized returns. That salt settles on metal and eats at seams. We inspect blower housing integrity before cleaning so we don’t send rust particles through your supply side.
- Separated trunk-to-branch connections. Lennox rigid sheet-metal trunk transitions mated to short flex branches separate at taped joints after decades of slab-level damp. Humid crawlspace air then gets pulled into the supply side. We mastic-seal and re-secure those connections as part of the cleaning, not as an upsell.
- Quietly degraded airflow from variable-speed blowers. Lennox Signature-series variable-speed blower modules can mask restricted, moisture-loaded filter and return paths. The airflow drops gradually instead of tripping a fault code. You get a weak system that never quite feels right. We diagnose the duct restriction behind the blower behavior.
- Musty smell that returns weeks after a basic cleaning. In Foster City, slab damp wicks into original underslab duct runs. A standard vacuum job removes surface debris but leaves the moisture source untouched. We scope for slab-level moisture staining and salt corrosion at galvanized joints before quoting, then address the actual cause.
Lennox Service in Foster City: What Local Conditions Mean for Your Equipment
Foster City is built almost entirely on engineered fill over former San Francisco Bay marsh. Your slab-on-grade 1960s or 1970s ranch home sits in one of the dampest microclimates on the Peninsula. That matters for your Lennox system in ways a generic cleaning company never considers. Original underslab and low-attic duct runs in this city routinely show moisture staining that has nothing to do with your HVAC running at all. Before we quote a standard cleaning on a Lennox system in Foster City, we check for slab-level damp, salt-air corrosion on galvanized trunk joints, and condensation damage from the persistent overnight marine layer. A duct cleaning that ignores these conditions just redistributes mold spores and sends you a bill.
In the 94404 ZIP specifically, the housing stock skews toward mid-century ranch layouts with short attic spaces and accessible crawl areas in some pockets. Those low attics trap the cool, humid air that rolls in off the Bay every night. Your Lennox coil sits in that environment year-round. We’ve pulled wet fiberglass insulation off coil cabinets in Foster City that looked like it had been soaked with a hose. It hadn’t. It was forty years of marine condensation doing its quiet work.
Lennox Models & Products We Service in Foster City
We work on the full range of Lennox residential equipment found in Foster City homes, from Merit Series gas furnaces (ML195 and ML196 families) to Elite Series furnaces and air handlers (EL195 and EL296) to Dave Lennox Signature Collection systems (SL280 and SL297). We also service Lennox XC and EL series outdoor condensers paired with matching indoor coils, since ductwork problems often start at the coil interface.
For parts, we lean on OEM Lennox coils, blower assemblies, and cabinet components when a match matters for fit and refrigerant compatibility. Where quality aftermarket material performs identically, like flex, mastic, and insulation, we use it. We stock common supplies for fast Foster City turnaround. For older Lennox equipment with corroded cabinets and saturated insulation, we’re straight with you: sealing and coil treatment can buy years, but we won’t oversell a cleaning on a system that’s structurally done.
See the difference
Before
After
Before
After
Before
AfterLennox Service Pricing in Foster City
Lennox air duct cleaning in Foster City typically runs $450 to $900 for a full system on a single-family home, depending on the number of returns, the length of trunk runs, and whether we’re addressing coil contamination or sealing separated joints. A straightforward cleaning on a smaller rancher sits at the lower end. A two-story addition with original underslab runs and multiple Lennox air handlers runs higher.
What drives cost here is access and condition. Underslab ductwork in Foster City takes longer to inspect and clean than attic runs. Corroded galvanized joints need mastic work and re-insulation, not just a pass with the rotary brush. Every estimate is free and includes a camera scope of your actual duct runs before we quote. Call (833) 620-5944 and we’ll give you a number that holds.
Serving Foster City, CA – Our Local Coverage Area
We’re based in the Foster City 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 Foster City
Because the smell is coming from moisture inside your ducts or at your coil, not from the filter. In Foster City, the marine layer keeps your Lennox coil and nearby insulation damp for most of the year. That damp feeds microbial growth that a filter change can’t touch. We find this on Lennox cased coils and at the coil-to-plenum transition constantly in 94404 homes. The fix is coil cleaning, insulation replacement where saturated, and often sealing slab-damp entry points. Call (833) 620-5944 if the smell is back after a filter swap.
In most cases, no. Interior duct cleaning and coil work don’t require architectural review. But Foster City has a large share of HOA-governed planned-unit developments, and any work that touches roof penetrations, exterior vents, or visible changes to your home’s exterior may need approval first. We’ll tell you if your specific job looks like it crosses that line before we schedule. When we provide Lennox service in Burlingame and Foster City, we coordinate around HOA requirements rather than hoping nobody notices.
Yes, and that’s the whole point of scoping before cleaning. Foster City sits on engineered fill over Bay marsh, which means slab-level damp can stain and corrode original duct runs even when your Lennox furnace is running perfectly. We check trunk joints for salt corrosion, inspect insulation for moisture wicking from below, and look at whether the coil is wet from condensation or from surrounding humidity. Those clues tell us the source. Call (833) 620-5944 and we’ll scope your system before quoting.
Usually the ducts. Sig-series variable-speed blowers in Foster City homes often mask restricted, moisture-loaded return paths. The blower ramps down quietly instead of tripping a fault code, so you get weak airflow and a system that never quite performs. We test pressure drop across the return side and camera-scope the runs before touching the blower module. If it is the blower, you want an honest answer, not a $2,500 guess. We’ll show you the video.
It depends on how far the corrosion has gone. We’ve extended the life of many 1970s and 1980s Lennox air handlers in Foster City and through our South San Francisco Lennox service by cleaning coils, sealing cabinet seams, and replacing saturated insulation. But if the blower housing is structurally rusted and the cabinet is losing integrity, we’ll tell you a cleaning is throwing money at a system that’s done. We make that call with photos, not a sales pitch. Call (833) 620-5944 for an honest assessment.
Service Areas Near Foster City
We run Lennox duct cleaning and coil work from Foster City down the Peninsula and across the Bay. That includes San Mateo, where 1950s and 60s Lennox furnaces show the same marine-layer wear, plus Daly City, Alameda, Berkeley, and Richmond. For Lennox-specific work in those areas, see our Lennox service in Mission District page or Lennox service in San Bruno. We cover the full Foster City service area including all of 94404.
Book Your Lennox Service in Foster City Today
Your Lennox system deserves a cleaning that addresses the moisture and salt-air conditions specific to Foster City, not a generic vacuum pass. Call (833) 620-5944 for a free estimate that includes a camera scope of your actual duct runs. We’ll show you what’s in there before we touch it, and we’ll show you the same ducts after.
Written by Bruce Lowry, Owner at Everclear Air Duct Cleaning, serving Foster City since 2017.