Fast, Reliable Air Duct Cleaning Across San Lorenzo
Air duct cleaning in San Lorenzo typically runs $380–$620 for a full residential system, with most jobs completed in a single visit. If your Bohannon-era home on Via Alamosa or around Lewelling Boulevard has never had its ducts opened up, you’re likely pulling conditioned air through decades of accumulated debris, moisture damage, or worse — collapsed flex duct hidden in that low crawl space.
We’re Brian Rivera’s Air Duct Cleaning crew, and we know San Lorenzo’s housing stock inside out. From the original 1944 Bohannon tracts near Hesperian Boulevard to the later phases around Washington Manor, we’ve spent 14 years crawling through the same damp, tight spaces your ducts live in. We’re usually on-site in San Lorenzo within 24–48 hours of your call. Phone us at (855) 908-0725 for a free estimate — we’ll give you an honest assessment of what you’re actually dealing with under there.
Why Northstar Air Duct Cleaning Service San Francisco Is San Lorenzo’s Preferred Air Duct Cleaning Company
Our reputation in San Lorenzo was built one crawl space at a time. Homeowners here talk — especially when a technician actually shows up prepared for what Bohannon homes throw at them. We’ve earned 1,209 verified reviews averaging 4.9 stars, and a disproportionate share of our San Lorenzo calls come from neighbors who heard about us from someone on their block.
Brian Rivera — owner and lead technician — handles your job personally. That means the most experienced person in the company is the one squeezing into your crawl space, not some dispatched contractor seeing their first 1950s sheet metal trunk. We’ve learned the hard way which tools fit between Bohannon foundation piers and which ones don’t.
Our response time to San Lorenzo averages same-day or next-day scheduling, with emergency calls for suspected mold or collapsed duct prioritized. We carry professional-grade Rotobrush and Nikro equipment sized for residential access, plus Abatement Technologies HEPA containment for jobs where contamination is severe. This isn’t the equipment a generalist keeps in a side van.
Our Air Duct Cleaning Services in San Lorenzo
Residential Duct Cleaning
San Lorenzo’s single-story Bohannon homes — typically 1,100–1,400 square feet — were built without central HVAC and retrofitted years later with forced-air systems running through crawl spaces. Our residential cleaning addresses the full supply and return network, including the original sheet metal trunks and later flex duct additions that make up most San Lorenzo systems. We price residential jobs in San Lorenzo between $380 and $620 depending on system complexity and contamination level. Every residential job includes pre- and post-inspection photos so you see what was actually removed.
Commercial Duct Cleaning
San Lorenzo’s commercial base includes small retail along Hesperian Boulevard, medical offices near East 14th Street, and light industrial near the BART corridor. These buildings face different challenges than residential — higher occupant loads, rooftop package units, and code requirements for indoor air quality documentation. Our commercial duct cleaning in San Lorenzo starts at $850 for smaller systems and scales based on linear footage and access difficulty. We use Abatement Technologies portable HEPA units for containment and provide written documentation for property managers and facility compliance.
Supply Duct Cleaning
The supply side — where conditioned air pushes out to your rooms — is where San Lorenzo homeowners notice problems first: weak airflow from certain vents, musty smells when the system kicks on, or uneven heating that has you cranking the thermostat. In Bohannon homes, supply ducts often run through the most moisture-compromised crawl space sections, making them prone to mold colonization and joint separation. Our supply duct cleaning in San Lorenzo runs $220–$380 as a standalone service, though we typically bundle it with return cleaning for complete system balance. We use Rotobrush contact cleaning for flex duct and Nikro skipper balls for rigid metal trunk lines.
Return Duct Cleaning
Return ducts pull air back to your furnace — and they pull everything else with it. In San Lorenzo’s older homes without adequate filtration history, returns often contain the heaviest debris loads: pet hair, renovation dust, pollen from the nearby Bay marshlands, and the fine particulate that slips through aging filter slots. Return duct cleaning in San Lorenzo costs $180–$320 standalone. We pay special attention to return plenums in retrofitted systems, where sheet-to-flex transitions are common failure points for both debris accumulation and structural separation.
Full System Cleaning
Most San Lorenzo homeowners need the complete package — supply, return, trunk lines, and plenums — especially when we find the multi-era splice problems that are routine here. Full system cleaning in San Lorenzo ranges from $480 to $780 depending on system size, contamination severity, and whether we need to address collapsed or separated sections during the same visit. This is our most common service call in 94580.
Video Inspection
Here’s where we separate ourselves from competitors who blow and go. Our video inspection service — $150–$250 as a standalone, often waived with booked cleaning — sends a high-resolution camera through your entire duct network. In San Lorenzo’s low-clearance Bohannon crawl spaces, this is often the only way to see collapsed flex duct, standing water, or mold colonies that standard cleaning tools would simply bypass. The camera doesn’t lie, and neither do we about what needs doing.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Lorenzo
We don’t show up with generic tools and hope for the best. Our Rotobrush and Nikro cleaning systems are the same units used in commercial remediation jobs — sized down for residential access, but built for actual debris removal, not just surface disturbance. For air quality solutions after cleaning, we install and service Honeywell and Aprilaire whole-home products, and our sanitizing treatments use Guardsman-grade applications where microbial contamination warrants it. We carry common replacement components for San Lorenzo’s most frequent retrofit-era systems, so when we find a separated joint or compromised flex section during your cleaning, we can often address it same-day rather than scheduling a return trip.
Common Air Duct Cleaning Problems We See in San Lorenzo Homes
- Crawl-space flex duct collapses from persistent marine moisture. San Lorenzo’s position 2–3 miles from San Francisco Bay puts it in the marine fog belt where morning condensation and high ambient humidity are routine. Flex duct installed in retrofits during the 1980s and 1990s has often softened at connection points and fully collapsed, creating gaps where your HVAC pulls unfiltered crawl space air directly into your living space.
- Multi-era duct systems separate at splice points due to adhesive failure. The original 1950s sheet metal trunks in Bohannon homes were later spliced to flex duct runs, and the adhesives and mechanical fasteners used in those retrofits degrade faster in San Lorenzo’s humid crawl spaces than in drier inland East Bay cities like Livermore or Dublin. We find separated joints on roughly half the San Lorenzo homes we inspect.
- Mold colonization in low-clearance crawl spaces goes undetected. Standard cleaning tools can’t access the tight foundation gaps in Bohannon construction — typically 18–24 inches of clearance. Without video inspection, mold colonies can grow unchecked for years, pumping spores through every vent in your home every time the blower cycles.
- Retrofit ductwork bypasses filtration entirely. When flex duct collapses or pulls apart, your system develops suction leaks that draw air around the filter — not through it. Homeowners in San Lorenzo often replace filters religiously while breathing unfiltered crawl space air, never realizing the real problem is structural duct failure below the floor.
Pricing for Air Duct Cleaning in San Lorenzo, CA
| Service | Typical Range in San Lorenzo |
|---|---|
| Residential full system cleaning | $380 – $620 |
| Commercial duct cleaning (small system) | $850 – $1,400 |
| Supply duct cleaning only | $220 – $380 |
| Return duct cleaning only | $180 – $320 |
| Video inspection | $150 – $250 (waived with booked cleaning) |
| Duct sealing/repair (per linear foot) | $12 – $18 |
| Partial flex duct replacement | $280 – $450 per run |
What moves you within these ranges? System accessibility is the big one — Bohannon crawl spaces with 18-inch clearance take longer to work in than homes with full basements. Contamination severity matters too: light dust and debris versus heavy mold colonization requiring HEPA containment. Multi-era systems with both sheet metal and flex duct require dual cleaning methods, adding time but delivering thorough results. We don’t quote over the phone without seeing your setup — but we don’t charge to look, either. Call (855) 908-0725 for a free, on-site estimate with no pressure to book.
We Also Serve Cities Near San Lorenzo
Our service radius covers the full East Bay flatlands corridor. We regularly work in Ashland along the San Leandro border, San Leandro proper with its mix of mid-century and newer construction, Cherryland‘s unincorporated residential pockets, and Castro Valley where hillside homes present different duct access challenges than San Lorenzo’s flatland tracts. Each city gets the same owner-led approach — Brian Rivera on every job — but the specific problems we find vary with local housing stock and geography.
Serving San Lorenzo, CA — Our Local Coverage Area
We’re based in the San Lorenzo 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 — Air Duct Cleaning in San Lorenzo
San Lorenzo’s marine fog belt location — roughly 2–3 miles from San Francisco Bay — creates sustained high humidity that drier inland East Bay cities like Dublin or Livermore simply don’t experience. Morning condensation in crawl spaces is routine here, and when that moisture contacts organic debris inside ductwork, mold colonizes faster and more extensively. If you smell mustiness when your system kicks on, that’s likely what you’re breathing. Call (855) 908-0725 — we’ll video-inspect and show you exactly what’s growing down there.
Yes — original sheet metal trunk lines from the 1940s and 1950s are actually more durable than the flex duct retrofitted later, and they clean beautifully with our Nikro skipper ball system. The key is identifying where original metal meets later flex additions, since those splice points are the weak links. We inspect every joint before cleaning and adjust our methods to protect vintage metal while addressing compromised connections. Most 1948 Bohannon systems we encounter need some sealing or partial flex replacement alongside cleaning — we’ll tell you straight if that’s your situation.
Absolutely — and in San Lorenzo’s low-clearance Bohannon crawl spaces, it’s often the only way to see collapsed or separated duct sections that standard cleaning brushes would simply bypass. On a recent job on Via Alamosa in the core Bohannon tract, we found a forced-air system where the original 1950s sheet metal trunk had been spliced into 1990s flex duct that had fully collapsed from moisture-softened connections. The homeowner had no idea their central HVAC was pulling air through a three-foot gap under the house; we sealed the joint and recommended a partial duct replacement to prevent future mold growth. Without the camera, we’d have cleaned the accessible sections and missed the real problem entirely.
The sheet metal trunk lines from the 1950s are typically worth preserving — they’re built from heavier-gauge steel than modern equivalents and respond well to professional cleaning. The furnace itself and any flex duct retrofits are different questions. A 1950s furnace is far below modern efficiency standards and may be distributing combustion byproducts if heat exchanger integrity is compromised. We don’t sell furnaces, so we’ll tell you honestly: clean and seal the metal ducts, but budget for HVAC replacement if your furnace is original. We can coordinate with your HVAC contractor to clean before they install new equipment, so you’re not contaminating fresh ductwork.
We guarantee our cleaning and sealing workmanship for one year, and we document pre- and post-cleaning conditions with photos and video. For San Lorenzo’s persistent moisture environment, we specifically guarantee that any duct section we’ve sealed will remain intact for 12 months under normal operating conditions — and we’ll return to reseal at no charge if a joint we treated separates. We also warranty our Guardsman-grade sanitizing treatments against mold regrowth for 90 days, though we always recommend addressing underlying crawl space moisture with a vapor barrier or dehumidification for permanent protection. Call (855) 908-0725 to discuss which guarantee applies to your specific situation.
Ready to see what’s actually in your San Lorenzo ducts? Brian Rivera and our crew are booking now in 94580 and surrounding areas. We’ll arrive with Rotobrush and Nikro equipment sized for your Bohannon home’s tight spaces, video-inspect before we quote, and give you straight answers about whether cleaning, sealing, or partial replacement makes sense. Estimates are free, owner-led, and no-pressure. Call (855) 908-0725 today.
Written by Brian Rivera, Owner at Northstar Air Duct Cleaning Service San Francisco, serving San Lorenzo and the East Bay since 2010.