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
We clean and repair Lennox duct systems across Sunnyvale, from the 1950s ranches east of Mathilda Avenue to the newer townhome clusters around Peery Park. Our work is independent: we know Lennox cabinet layouts, coil interfaces, and duct connectors because we service them every day, not because we carry a manufacturer badge. The difference that matters in Sunnyvale is that we understand how Eichler-era attics and dense Moffett Park condo systems fail in ways a generic duct company misses. Call (866) 593-7291 for a free estimate and we’ll tell you exactly what’s in your ducts before we touch anything.
Why Sunnyvale Residents Choose Us for Lennox Service
The Lennox equipment in Sunnyvale spans seventy years of engineering evolution. A 1962 Signature Series air handler in a downtown ranch shares almost nothing with a variable-speed unit in a 2018 Murphy Avenue townhome, except the nameplate. We work on both, and everything in between. Our owner, Noel Brandt, grew up near the Murphy Avenue corridor and has spent the better part of two decades pulling duct work apart and putting it back together right. He learned the trade through hands-on lab work at Foothill College in Los Altos Hills, where the training emphasized what residential systems actually look like on the inside, not how they appear on an installation diagram. That grounding in reality is why we lead with camera inspections before and after every job. For full-service coverage across the area, see our Sunnyvale service area details.
We arrive with Rotobrush rotary brush extraction systems and Nikro HEPA-rated vacuum units, the same equipment commercial contractors spec for remediation projects. Not a shop vac and a prayer. We’re also set up to handle Lennox sales & service knowledge beyond cleaning: when we find a failed flex connector or a duct separated at the cabinet, we repair it on site rather than telling you to call someone else.
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
- Mastic failure at Signature Series return plenums. In older Sunnyvale attics, the original mastic sealing the return plenum to the air handler dries out after repeated winter rains and temperature swings. Once the seal cracks, attic dust and whatever is living up there gets pulled directly into the return air stream. We re-seal those joints with fresh mastic after cleaning, because cleaning without sealing just refills the ducts within a season.
- Sagging flex duct at Elite Series horizontal furnaces. Eichler-influenced homes near downtown commonly have horizontal furnaces in tight attic spaces. The flex connectors between the furnace cabinet and the rigid duct sag over time, separate at the collar, and leak conditioned air into the attic while pulling attic air into the system. We clean the full run, reattach the flex with proper connectors, and verify airflow at every register.
- Dust-packed evaporator coils on Merit Series furnaces. The tight mechanical closets in townhomes around Moffett Park leave little room for filtration to work properly. Coils above the heat exchanger collect a hard-packed layer of dust, condensate drains clog, and airflow drops. We clean the coil, clear the drain, and check for standing water that points to a bigger issue.
- Debris buildup on variable-speed blower wheels. Newer Lennox units in Sunnyvale condos often have return ducts that were undersized for the blower. High static pressure makes the blower work harder and pick up more airborne dust, which packs onto the wheel. The result is louder operation and reduced airflow. We clean the blower wheel and, when the static pressure is clearly wrong, tell you what it would take to fix the duct sizing properly.
- Rodent intrusion in attic duct runs. Sunnyvale’s rainy winter season pushes rodents into attics looking for dry shelter, and for a mouse, a metal duct run with a loose register boot is an inviting tunnel. Chewed insulation, droppings, and contaminated surfaces require more than a basic cleaning. We handle the cleanup with HEPA-level containment and repair the entry points we can access.
Lennox Service in Sunnyvale: What Local Conditions Mean for Your Equipment
Sunnyvale’s mild, dry Mediterranean climate means Lennox systems run fewer hours than in Sacramento or Tracy, so dust accumulates slowly but steadily. The bigger problem is moisture. When atmospheric-river storms roll through in winter, attics get damp enough to soften mastic, loosen duct tape, and make insulation a soggy mess. In the Eichler-era homes scattered through the downtown grid and along Remington Drive, original metal ducts often show mouse-chewed insulation and loose mastic at the registers after a wet winter. Cleaning that system without re-sealing the joints just redistributes attic dust and whatever else through the house. We also see a pattern specific to the Peery Park and Moffett Park clusters: Lennox systems in townhomes often share return chases with the neighboring unit. Cleaning without verifying fire-rated dampers and shared-wall sealing can push dust and cooking odors from one condo into another. Noel’s signature phrase applies here: “If we can’t show you what we found, we haven’t done the job right.” We camera-inspect before and after, and we check those chase separations before running the Rotobrush through.
Lennox Models & Products We Service in Sunnyvale
We work on the full Lennox residential lineup: Signature Series, Elite Series, and Merit Series, in both legacy installations and current-model equipment. Our parts approach is straightforward. For critical components like control boards and blower motors, we use OEM Lennox parts whenever they’re available and competitively priced. For wear items that meet or exceed factory specifications, we’ll use high-quality aftermarket equivalents and tell you what we’re doing and why. This matters in Sunnyvale, where a 40-year-old Lennox furnace may sit two streets away from a five-year-old variable-speed air handler. The older equipment sometimes means a week of lead time on a specialty part, and we’ll give you an honest repair-versus-replacement assessment before you spend money. We keep common connector sizes, mastic, and register boots on trucks, so most duct repairs happen same-visit. For specifics on equipment coverage in neighboring cities, check our Lennox service in Santa Clara page.
See the difference
Before
After
Before
After
Before
AfterLennox Service Pricing in Sunnyvale
Duct cleaning for a typical Sunnyvale home runs between $450 and $900, depending on the number of systems, the linear feet of ductwork, and whether we’re cleaning a single-story ranch or a two-story townhome with hard-to-reach attic runs. A full cleaning with return duct work and coil cleaning on a larger system can reach $1,100 to $1,500. If we find damaged flex duct, loose mastic, or separated connections during the cleaning, repair work is quoted separately before we start. Same-day duct repair runs $200 to $500 for typical sections. We agree on one flat price per system before any work begins. No per-vent pricing, no bait-and-switch. Call (866) 593-7291 for an exact quote, and we’ll walk you through what we’re seeing in your 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
Every 4 to 6 years is reasonable for most Sunnyvale homes with a Lennox system that runs a standard cooling season. Homes near busy corridors like El Camino Real, or with pets, recent remodeling, or known rodent activity in the attic, may need cleaning every 3 years. If you’re unsure, we’ll camera-inspect before quoting and tell you whether cleaning will make a measurable difference or whether you can wait. Call (866) 593-7291 and we’ll set up an inspection.
Yes, but it requires checking the shared return chase first. In the Moffett Park townhome clusters, many Lennox systems share a return void with the adjacent unit. We verify the fire-rated damper and shared-wall seals before running equipment that could push dust or odors into the neighboring condo. If the separation is compromised, we repair it as part of the job and document everything with photos. Estimates are free, so call (866) 593-7291 if you’re in that area.
Usually it’s either ductwork pulling attic air through failed seals, or a dust-packed coil holding moisture and growing mold in the condensate. In Sunnyvale homes, the winter rains saturating attic insulation and the furnace cycling between heat and cool are common triggers. We start with a video inspection of the return and supply sides, then decide whether cleaning, sealing, or a coil treatment is the right fix. You’ll see the problem on camera before we quote it.
For critical components like control boards and blower motors, yes, we use OEM Lennox parts when they’re available and competitive. Duct connectors, mastic, flex duct, and register boots are standard components where quality aftermarket brands meet or exceed OEM spec, and that’s what we use. You’ll know the brand and the reasoning before we install anything. For work in cities across the bay, we also handle Lennox service in Fremont.
The rain itself doesn’t enter the ducts, but the attic moisture it creates does. Saturated insulation, softened mastic, and the rodent traffic that comes with the rain can all compromise duct seals and put attic air into your return stream. Older metal ductwork in Sunnyvale’s ranches is especially susceptible because the original mastic has had decades to dry and crack. We recommend checking seals after a wet winter, and cleaning is the right time to do it. Call (866) 593-7291 for a free estimate.
Service Areas Near Sunnyvale
We service Lennox equipment throughout Sunnyvale, including the downtown ranches, the Peery Park and Moffett Park townhome clusters, and the neighborhoods along El Camino Real. We also cover nearby cities, including Santa Clara, Mountain View, Cupertino, Fremont, and Palo Alto. If you’re west of the Lawrence Expressway or south toward the 85 corridor, we can likely be there the same week. Our Sunnyvale service area page has the full list.
Book Your Lennox Service in Sunnyvale Today
Let’s look at your ducts before you decide anything. We’ll camera-inspect the system, show you what’s in there, and quote one flat price per system. Then you decide. Call (866) 593-7291 to schedule your free Lennox duct estimate in Sunnyvale.
Written by Noel Brandt, Owner at Duct Cleaning Sunnyvale, serving Sunnyvale and the surrounding Bay Area since 2006.