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 Sunnyvale, CA
Lennox air duct cleaning in Sunnyvale typically runs $400 – $800 for a full system, and we complete most jobs in 4 – 6 hours. Heritage Duct Cleaning is an independent provider serving all four Sunnyvale ZIP codes with commercial-grade Rotobrush and Nikro equipment. What makes our Lennox work different here: we understand how the city’s split housing stock, the damp crawlspaces in 94085 and 94086, and the move-in remediation needs in 94087 and 94089 affect your specific system. Call (855) 550-3778 for a free estimate.
Why Sunnyvale Residents Choose Us for Lennox Service
Our crew has spent years pulling, repairing, and resealing the Lennox ducted systems that dominate Sunnyvale’s mid-century housing stock, so we know the model lines, plenum layouts, and control boards on sight. We are an independent shop, not authorized, sponsored, or endorsed by Lennox, and we diagnose each system on its own merits rather than defaulting to brand-line talking points. That independence matters in a city where a 1962 Lennox Merit furnace and a 2015 Dave Lennox Signature system can sit three blocks apart and need completely different approaches. Noel Carvalho, our owner, trained in HVAC fundamentals at Mission College right here in Santa Clara and has been cleaning and inspecting ducts in the South Bay for going on eighteen years. He grew up in the Willows neighborhood, a few miles from Levi’s Stadium, and he still treats every Sunnyvale job like it’s in his own backyard. For broader brand context, see our Lennox sales & service page.
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 Sunnyvale
- Cased-coil and plenum cabinet seam separation: Lennox furnaces, especially the older Merit Series ML180/ML193 family, rely on sheet-metal plenum-to-cabinet joints sealed with mastic. After two or three decades of heat cycling, that mastic cracks and the seams loosen. In Sunnyvale’s 94085 and 94086 crawlspaces, the winter fog belt keeps things damp enough that loosened seams actively pull moisture and rodent debris into the return side.
- Separated flex duct collars at the air handler: Lennox Elite and Dave Lennox Signature air handlers move a lot of air, and over years the flex collars at the unit can separate. When that happens in a low-clearance Sunnyvale attic, the blower pulls fiberglass insulation and hot attic air instead of conditioned return air. We re-strap the collars and mastic-seal the connections as part of a full cleaning.
- Clogged condensate traps and secondary heat exchanger debris: High-efficiency Lennox furnaces in damp crawlspaces collect more than water in their traps. In the fog-belt neighborhoods of Sunnyvale, we regularly find condensate traps packed with debris that’s migrated downstream into supply runs. A routine cleaning that ignores the trap is a half-finished job.
- Pinhole rust and mastic failure on sheet-metal plenums: Original Lennox Merit furnaces in 1950s and 1960s Sunnyvale homes often have sheet-metal plenums that have been sitting in a damp crawlspace for sixty years. Pinhole rust forms, mastic fails, and supply registers start throwing dust within weeks of a cleaning. We inspect the plenum, not just the ducts.
- Rodent nests packed around the plenum in abandoned gravity duct systems: In older 94085 and 94086 homes, the original Lennox forced-air system was often installed alongside the old octopus gravity furnace in the same crawlspace. Those abandoned gravity ducts become superhighways for rodents. Nests packed around the live plenum are a common Sunnyvale finding, and they have to be removed and sealed off before a cleaning means anything.
Lennox Service in Sunnyvale: What Local Conditions Mean for Your Equipment
In Sunnyvale’s 94085 and 94086 blocks, original Lennox forced-air furnaces were often installed alongside the old octopus gravity furnace in the same damp crawlspace. A real cleaning job there means sealing off the abandoned duct stubs before they keep feeding fog-belt moisture and rodent debris into the live return. We’ve seen this play out on a 1962 ranch off Morse Avenue in 94086 during our Air Duct Cleaning in Sunnyvale: our tech found a Lennox Merit furnace whose return plenum had pulled loose from the cabinet, with rodent nests packed between the abandoned gravity duct and the new flex run. We video-inspected the trunk, removed the nests, mastic-sealed the plenum-to-cabinet joint, and re-strapped the separated flex collars. The homeowner’s supply registers stopped throwing dust within a day. That’s the difference between a surface-level cleaning and the job Sunnyvale’s older housing stock actually requires. We don’t clean what doesn’t need it, and we don’t skip what does.
Lennox Models & Products We Service in Sunnyvale
We service the full residential Lennox lineup found across Sunnyvale service area homes: Merit Series gas furnaces (ML180 and ML193 families), Elite Series furnaces and EL-series air handlers, Dave Lennox Signature Collection variable-speed systems, and the 13ACX and XC13 air conditioners paired with Lennox cased coils. For anything affecting combustion, controls, or the coil cabinet, we use OEM Lennox parts. Where the failure is duct-side rather than brand-specific, we use quality aftermarket flex, mastic, and insulation. That split keeps repairs honest without overspending on brand markup where it doesn’t matter. On a 30-plus-year-old Lennox furnace sharing a crawlspace with abandoned gravity ducts, we’ll tell you straight when sealing and cleaning the existing system beats replacing an otherwise serviceable furnace.
See the difference
Before
After
Before
After
Before
AfterLennox Service Pricing in Sunnyvale
- Full system air duct cleaning: $400 – $800 depending on home size, number of zones, and crawlspace or attic access difficulty.
- Video inspection add-on: Included in our full cleaning. We don’t charge extra to show you what we found.
- Duct sealing (mastic and collar repair): $150 – $450, quoted after inspection, based on the number of separated collars and leaking seams.
- Dryer vent cleaning: $120 – $180, recommended as a bundled add-on when the dryer vents through a crawlspace.
What drives cost in Sunnyvale: access. Low-clearance attics in mid-century ranches and damp crawlspaces under Eichler-style homes take longer to work in than a clean basement. A free estimate includes a walkthrough of your system, not a number pulled from a script. Call (855) 550-3778 for an exact quote on your Lennox system.
Serving Sunnyvale, CA – Our Local Coverage Area
We’re based in the Sunnyvale 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 Sunnyvale
No. The abandoned gravity ducts only need to be sealed off, not cleaned. We close off the old stubs so they stop feeding crawlspace air and rodent debris into the live Lennox return, then clean the active ductwork. Call (855) 550-3778 and we’ll assess what’s actually connected to your system.
Yes. The seasonal fog off the Bay keeps crawlspaces in those ZIP codes damp for months at a time. That moisture accelerates mastic failure on Santa Clara plenum seams and makes rodent activity around abandoned gravity ducts worse. Your ductwork isn’t just dusty; it’s in a damp, pest-prone environment that other parts of Sunnyvale don’t deal with the same way.
In most Sunnyvale homes, yes. We access the cased coil through the service panel, clean it in place, and inspect the cabinet seams while we’re in there. On the rare layout where the coil is buried, we’ll tell you before we start and adjust the quote.
Often, yes. The musty smell in a 1970s ranch usually comes from years of the system sitting idle with damp crawlspace air pulled through the return. A full cleaning plus coil cleaning and plenum inspection solves most of those cases. If we find structural leaks or rodent contamination during the video inspection, we’ll show you exactly what needs repair before you spend money on anything else. Call (855) 550-3778 for an assessment.
For anything on the furnace itself, controls, or coil cabinet, we use OEM Lennox parts. For duct-side repairs like flex collars, mastic, and insulation, we use commercial-grade aftermarket materials where brand name adds cost without adding performance. We’re upfront about which is which before any work starts.
Service Areas Near Sunnyvale
We serve all four Sunnyvale ZIP codes (94085, 94086, 94087, 94089) plus nearby Santa Clara, Mountain View, Cupertino, and Milpitas. If you’re east of 880, see our Lennox service in Fremont page. For homes south of Stevens Creek, we cover Lennox service in Cupertino as well.
Book Your Lennox Service in Sunnyvale Today
We inspect what’s actually wrong with your Lennox system before we quote anything. One flat price per system, agreed before work starts, with before-and-after video of your own ducts. Call (855) 550-3778 now to schedule your free Sunnyvale estimate.
Written by Noel Carvalho, Owner at Heritage Duct Cleaning, serving Sunnyvale since 2015.