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.
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AfterLennox Air Duct Cleaning in San Francisco, CA | Hollis Air Duct Cleaning
We provide independent Lennox Air Duct Cleaning - San Francisco, from the Outer Sunset to Bernal Heights. The one thing that makes our Lennox work different here: we treat this city’s pre-war housing stock as the system it actually is. Most San Francisco Lennox equipment sits in unheated basements, open floor-joist returns, and shared wall chases that change what cleaning and sealing genuinely require. Call (361) 326-5060 and we’ll give you a written price before any work starts.
Why San Francisco Residents Choose Us for Lennox Service
We’ve spent years working on Lennox residential equipment in San Francisco’s oldest housing. That matters because a Lennox Merit furnace in a 1930s Outer Sunset Edwardian behaves differently than the same model in a suburban tract home. The return air path may run through structural framing. The flex duct may be original to the 1990s and rotting from fog salt. Roy Castellanos, our owner, came up through the mechanical trades and built this company around one thing: knowing what’s actually inside the ductwork before we quote you a number, including for our Dryer Vent Cleaning in San Francisco. No guesswork, no upsells, no moving targets.
We run professional-grade negative-air machines from Nikro and rotary brush systems from Rotobrush. Every technician is background-checked and uniformed. The price is written down before we touch anything, and every job carries our 365-Day Done Right Promise. In a city where shared walls and landlord access make duct work more complicated than most markets, that discipline is the difference.
Common Lennox Air Duct Cleaning Problems We Solve in San Francisco
- Corroded pre-2000 Lennox flex duct. The cold, salty crawlspace air under Sunset and Richmond homes destroys the interior lining of older flexible duct runs. We routinely open systems and find the lining shedding fibers into the airstream, which means the right fix is replacement, not just cleaning.
- Mold on Lennox evaporator coils and blower wheels. Most San Francisco homes don’t run air conditioning, so the coil sits damp year-round from marine-layer humidity. That wet coil is a breeding ground for biological growth that then blows through every vent in the house.
- Gravity-conversion return air leaks. Many Lennox furnaces in San Francisco were retrofitted into homes built for gravity heat. The return air path is often the open floor joist cavities themselves, pulling rodent debris and crawlspace air directly into the system.
- Failed mastic and tape at plenum connections. Decades of thermal cycling in unheated basements breaks down the sealant at Lennox plenum and takeoff connections. The result: you’re paying to heat air that leaks into a basement nobody uses.
- Shared wall chase contamination in attached housing. In neighborhoods like the Mission and Bernal Heights, duct chases run through party walls. A neighbor’s rodent or moisture problem becomes your duct problem, and cleaning requires coordinating access with other units.
Lennox Service in San Francisco: What Local Conditions Mean for Your Equipment
Here’s what no generic Lennox page will tell you. In the Sunset and Richmond districts, many original gravity-furnace return-air paths are the open floor joist cavities themselves. That’s not a metaphor. The building’s structural framing is the return duct. So cleaning and sealing a Lennox system in those neighborhoods means treating the joist bays as ductwork: video inspecting them, removing rodent debris and fog-damp mold, and mastic-sealing the wood surfaces before reinstalling the furnace. A suburban crew that only cleans metal pipe would miss most of what your Lennox system actually pulls air through. In an Outer Sunset Edwardian off 41st Avenue, we opened a 1990s Lennox G40 furnace and found the return air being drawn straight through unsealed joists that had collected decades of debris. We ran video inspection through the corroded flex supply runs, cleaned and mastic-sealed the joist returns, replaced the deteriorated flex, and reinstalled the Lennox air handler with a healthy return static pressure. That’s the job done right in San Francisco, not just cleaned.
Lennox Models & Products We Service in San Francisco
We work on the full range of residential Lennox equipment you’re likely to find in San Francisco housing. That includes Merit Series gas furnaces, from the older G40 and G50 to newer ML180 and ML193 units. We service Elite Series furnaces and air handlers like the EL280, EL296, and CBX32M, as well as Dave Lennox Signature Collection equipment including the SL280 and SLP98. We also handle Lennox Healthy Climate whole-home media filters and UV systems. For critical components like blower motors and control boards, we use OEM Lennox parts. For flex duct, mastic, and registers, we use high-quality aftermarket equivalents when they meet or exceed original spec. And on corroded 1980s and 90s Lennox equipment, we give you a straight repair-versus-replace assessment rather than pushing a new system. If you’re considering Lennox sales & service, we’ll tell you honestly whether cleaning and sealing beats replacement.
Lennox Service Pricing in San Francisco
Air duct cleaning for a typical San Francisco home runs $450 to $850 depending on system size, accessibility, and condition. Gravity-furnace conversions in the Richmond or Sunset with open joist returns run higher because we’re cleaning structural framing, not just metal pipe. Duct sealing adds $300 to $700 depending on how many plenum and takeoff connections need mastic work. Flex duct replacement on older Lennox systems is quoted per run after video inspection. Every estimate is free, written down before work starts, and it does not move at the door. Call (361) 326-5060 and we’ll give you exact numbers for your system.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco 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 Francisco
Because your return air path likely runs through open floor joist cavities rather than sealed metal ducts. Cleaning those means cleaning structural framing, which takes more time, more video inspection, and mastic work on wood surfaces. A suburban sealed-duct job is straightforward by comparison. Call (361) 326-5060 for an exact quote after we see your system.
Usually yes, because the smell is typically mold on the evaporator coil and blower wheel that sits wet year-round from marine-layer humidity. We clean those components and the surrounding ductwork with negative-air containment, and the odor goes away when the biological growth does. If the flex duct lining has deteriorated and is holding moisture, replacement may be needed. Call (361) 326-5060 for a free inspection.
We replace it. Corroded, shedding flex duct cannot be meaningfully cleaned; the interior lining is already failing and will keep releasing fibers into your air. We quote the replacement per run after video inspection, and we use aftermarket flex that meets or exceeds original Lennox spec. The price is in writing before we start.
We clean the full air pathway, which includes the furnace blower wheel, evaporator coil if present, and the interior cabinet surfaces where debris collects. Those components sit in the same airstream as your ducts, so cleaning the ducts while leaving the blower wheel fouled would be half a job. We use OEM Lennox parts for anything that needs replacement.
We map the chase first with video inspection to see where your ductwork actually runs and whether anything from the neighboring unit is entering it. Then we coordinate access through whatever landlord or HOA arrangement applies, and we clean only the portion of the chase that serves your system. The whole estimate is written before work starts. Call (361) 326-5060 and we’ll walk through what your building needs.
Service Areas Near San Francisco
We serve the full San Francisco service area plus nearby markets through our network. Looking for Lennox service in Seattle? We’ve got crews there too. If you’re further east, see our Lennox service in Nashville-Davidson page. Clean ducts, straight answers – that’s the whole job.
Book Your Lennox Service in San Francisco Today
Call (361) 326-5060 and we’ll put a written price in your hand before any work begins. Serving San Francisco’s pre-war housing with the equipment, the discipline, and the 365-Day Done Right Promise that homeowners in this city deserve.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving San Francisco since 2004.