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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AfterFast, Reliable Air Duct Repair Across San Lorenzo
If your San Lorenzo home has rooms that never seem to heat or cool properly, the problem is rarely the furnace. In the Bohannon-era tract homes that define this community, the ductwork itself is usually the culprit. We’re talking about flex runs that have pulled apart in damp crawl spaces, crushed trunk lines, and joints that leak conditioned air into the dirt instead of your living room. Linden Air Duct Cleaning repairs all of it. We know San Lorenzo homes because we work in them every week. Call (980) 447-2498 for an honest assessment and a written price before any work begins.
Why Linden Air Duct Cleaning Is San Lorenzo’s Preferred Air Duct Repair Company
Homeowners in San Lorenzo have a specific worry when they call a repair company: who is actually walking through the door? We answer that question before the visit. Every technician we send to San Lorenzo is background-checked, identity-verified, and photo-badged under the Threshold Verified standard. You get the tech’s name and photo before the appointment, and they show a photo ID at your door. No exceptions. That matters in a community of older ranch homes where many residents are home alone during the day or have young children in the house. Marcus Veale, who leads our repair team, insists on that standard for every single job in San Lorenzo.
We also know what we’re walking into. Homes off Hesperian Boulevard and along the original San Lorenzo Village streets have crawl spaces with clearances so low a technician has to shimmy on their back. We plan for that before we arrive, bringing the right equipment and setting realistic time expectations. Our reputation in San Lorenzo is built on showing up prepared, doing the repair correctly the first time, and putting everything in writing. And if the repair fails within 365 days, we come back at no charge. That’s the Done Right Promise, in writing, on every job.
Duct Replacement in San Lorenzo
Duct Replacement in San Lorenzo usually means pulling out old flex duct that has collapsed, separated, or grown biological material inside, then running new insulated duct through the same crawl-space paths. The housing stock here makes this a regular job. Most San Lorenzo Village homes were built without central HVAC, and the systems added later used flex duct that is now 30 to 50 years old. It sits in damp, low-clearance crawl spaces where strapping rots and runs sag. A full duct replacement in a typical San Lorenzo ranch home runs $2,800 to $5,200, depending on how many runs, how accessible the crawl space is, and how much old duct has to be cut out.
When Replacement Beats Repair
If the inner liner of flex duct has separated or torn, patching it is a waste of money. We see this often in San Lorenzo homes where 1970s and 1980s retrofits were never properly supported. Replacement is also the right call when mold has colonized the interior of a run. Cleaning can’t fix degraded material.
What We Actually Replace
We replace supply and return flex runs, rigid trunks that are crushed, and the metal takeoffs at the plenum. We do not replace your furnace, and we’ll tell you straight if a section of duct is still serviceable. Every replacement job includes mastic-sealed joints and new strapping rated for damp crawl-space conditions.
Ductwork Installation in San Lorenzo
Ductwork Installation in San Lorenzo typically applies to additions, garage conversions, or rooms that were never connected to the central system. Many older San Lorenzo homes have a second bedroom or rear addition with no supply register at all, or a flex run so undersized it barely moves air. Installing a new run from the supply plenum through the crawl space to the room usually costs $450 to $1,100 per run in San Lorenzo, depending on the distance from the furnace and how much of the path has to be opened up. We give the full price in writing before work begins.
Adding Heat to a Cold Room
It is common for the back bedroom in a 1940s Bohannon ranch to be 8 to 10 degrees colder than the front of the house. Often that room is connected to the system by a single undersized run. A proper installation with correctly sized duct and dampered airflow can level out the difference.
Retrofit Challenges in Crawl Spaces
Installing ductwork under a raised foundation in San Lorenzo means working around pier blocks, plumbing lines, and original floor joists. We do it carefully, run-by-run, sealing everything with mastic and strapping the duct so it never sags into the dirt. This is slow, physical work, and we price it honestly.
Trusted Brands We Service in San Lorenzo
We work with Rotobrush and Nikro equipment for cleaning and inspection, and we stock common replacement parts and air-quality products from Abatement Technologies and Guardsman for San Lorenzo jobs. When a flex run in your crawl space needs replacing, we don’t have to order parts from a warehouse and come back next week. We keep the materials that San Lorenzo homes actually need on hand because we know the housing stock. That means less waiting between diagnosis and repair, and it means you get the job finished in one visit more often than not.
Common Air Duct Repair Problems We See in San Lorenzo Homes
- Separated flex runs in crawl spaces. The 1980s retrofits common in San Lorenzo Village were often installed with plastic zip ties and thin strapping. Decades of damp air and Hayward Fault micro-movement pull those joints apart. Air leaks into the crawl space instead of your rooms.
- Mold and mildew on duct interiors. The marine layer sits over San Lorenzo well into summer, and crawl spaces stay humid. When return ducts pull air through unsealed gaps, they draw ground moisture into the system. That moisture condenses inside the duct and feeds biological growth.
- Crushed or kinked trunk lines. Tradespeople running new pipes or doing foundation work over the decades often rest heavy material on exposed duct. In low-clearance crawl spaces, a crushed trunk line can strangle airflow to half the house.
- Duct strapping rotted through. We regularly find runs that have fallen completely off their supports and are lying in the damp soil under San Lorenzo homes. The strapping was never meant for continuous ground moisture, and after 40 years it fails.
Pricing for Air Duct Repair in San Lorenzo, CA
Let’s talk real numbers for San Lorenzo. A straightforward repair, like reconnecting a separated flex run and re-strapping it, typically runs $180 to $400. Re-sealing multiple joints at the plenum and takeoffs runs $350 to $650. Replacing a single collapsed flex run costs $450 to $1,100. A full duct replacement in a typical San Lorenzo Village ranch home lands between $2,800 and $5,200. What changes the price: how many runs are involved, how deep into the crawl space we have to work, and whether old duct has to be cut out in pieces. You will always get a written price before any work starts, and every repair carries the 365-Day Done Right Promise. Call (980) 447-2498 for a free estimate.
We Also Serve Cities Near San Lorenzo
While we spend a lot of time on the original Village streets of San Lorenzo, our Air Duct Repair teams also cover Castro Valley, San Leandro, Union City, and Oakland. The crawl-space problems we see in San Lorenzo extend to many of these neighboring communities. If you’re nearby and dealing with cold rooms or musty air, call us.
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 About Air Duct Repair in San Lorenzo
The back rooms lose heat because the duct runs feeding them are disconnected, crushed, or never properly sized in the first place. In Bohannon-era homes, the runs to the rear of the house travel the furthest through the crawl space, which means more joints to separate, more strapping to rot, and more exposure to damp ground air. We fix this by camera-inspecting the run, reconnecting or replacing it, and sealing every joint with mastic. Call (980) 447-2498 and we’ll find exactly where the air is going.
Yes. The marine layer in San Lorenzo keeps crawl-space humidity elevated for much of the year, and unsealed duct joints pull that damp air into the system. Once moisture is inside a flex run, mold and mildew follow. We see it most often in return ducts that run parallel to the ground. The fix is reconnecting and sealing the system, and replacing duct that is already compromised. If you smell something musty when the system kicks on, call (980) 447-2498 for an inspection.
We use low-clearance inspection cameras, crawl-space lighting, and technicians who are experienced working under San Lorenzo’s older raised foundations. Some sections are truly tight, and in those cases we work in stages, using proper respirators and protective gear. We do not send in someone without the right equipment or the right training. If a section is physically impossible to repair in place, we’ll reroute it and explain exactly why, with photos, before we do it.
It depends on the condition of the inner liner. If the liner is intact and the problem is a separated joint or failed strapping, repair makes sense and costs far less. But if the liner is torn, collapsed, or showing signs of mold inside, you will spend less in the long run replacing the run. In San Lorenzo’s damp crawl spaces, duct from that era is usually near the end of its service life. We’ll show you camera footage and let you decide with real information, not a sales pitch.
Yes. Even if your furnace or air handler is older, a system with intact, sealed ductwork will deliver far more of the air it produces to your rooms. Most San Lorenzo homes are losing 20% to 30% of their conditioned air into the crawl space before the repair. Fixing the ducts means the system you already have actually performs like it should. It is almost always the best first step, and it costs a fraction of a new HVAC system. Call (980) 447-2498 and we’ll walk you through what your ducts need.
Call Linden Air Duct Cleaning for Air Duct Repair in San Lorenzo
If your San Lorenzo home has cold rooms, dusty air, or a musty smell from the registers, the ductwork is the place to start. We’ll inspect it honestly, show you what we find, and give you a written price before any work begins. Marcus Veale and the repair team at Linden Air Duct Cleaning are ready to help. Call (980) 447-2498 for a free estimate.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving San Lorenzo homeowners with verified, accountable air duct repair since 2004.