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 Alamo
Air duct repair in Alamo typically runs $350 – $1,250 depending on whether we’re patching a single failed section or replacing collapsed flex duct in a multi-zone estate system. Most Alamo jobs are completed in one visit, and every repair carries a written 365-day guarantee. We know the houses here: 4,000 to 7,000 square feet, original 1980s duct runs through attics that bake at 130°F or more all summer, and air handlers that haven’t stopped since May. If your registers are blowing weak, your upstairs won’t hold temperature, or you’re smelling something musty when the system kicks on, call (980) 447-2498 and we’ll come look at it.
Why Linden Air Duct Cleaning Is Alamo’s Preferred Air Duct Repair Company
Alamo homeowners call us because we do the job the way this town expects things done: thoroughly, in writing, and without making you guess who’s at the door. Before any repair begins, you get a written price for the entire job. Not an estimate range, not a “we’ll see what we find.” A number. And when the work is finished, the repair is covered by our 365-Day Done Right Promise in writing. If it fails within a year, we come back and make it right at no charge.
Our techs working Alamo arrive with their name and photo sent to you ahead of the visit. At the door, they show a photo ID badge. Every single tech is background-checked and identity-verified under the Threshold Standard. Marcus Veale leads our team, and he holds the same standard for every house we walk into, whether it’s off Danville Boulevard or up in the hills near Las Trampas Ridge. We’ve been serving homeowners since 2004 as part of the Threshold Group family.
We also answer the phone. A live person picks up 24/7. No voicemail loops, no “press 3 for service.” Call (980) 447-2498 and you’ll talk to someone who can actually help.
HVAC Duct Installation in Alamo
HVAC Duct Installation in Alamo usually means one of two things: either a new section of insulated flex or rigid duct to replace a failed run, or full duct installation for a new zone or addition on an estate property. Given the scale of Alamo homes, we often install duct for a single system that serves 4,000 square feet or more, with runs that snake through unconditioned attics and crawl spaces where the right R-value insulation matters. A typical duct installation for a single zone or section in Alamo runs $500 – $1,200, depending on the length of the run, the insulation spec, and access. For a full multi-zone installation on a large custom home, costs can reach $4,000 – $8,000 or more.
Every installation gets the same treatment as a repair: a written price before the first cut, the right materials for the space, and a written guarantee on completion.
Replacing Collapsed Flex in Estate Attics
Alamo’s attics are brutal on flex duct. The original insulated flex installed in 1970s to 1990s builds gets hammered by 130 – 140°F heat every summer, and we regularly find sections that have kinked, collapsed, or separated entirely. The fix is new flex or rigid duct, properly supported and sized, not a patch that fails again in two years. We use professional-grade materials and a Nikro inspection camera to confirm the run is clear before we call the job done.
New Zone Ductwork for Additions and ADUs
More Alamo homeowners are adding ADUs and home offices on large lots, and those additions need their own duct runs tied into the existing system. We install duct for new zones with proper dampers and returns, because a room with a supply but no return will never hold temperature. You get the full layout priced in writing before we start.
Air Duct Replacement in Alamo
Air Duct Replacement in Alamo is a bigger job than installation, and it’s one we get called for often on the town’s original 1980s estate homes. When the flex duct throughout a system has deteriorated past the point of section repairs, replacement is the honest fix. A full air duct replacement in Alamo typically runs $1,800 – $5,500 for an average 3,500 sq ft home, and $5,000 – $9,000 for larger estates with multiple air handlers and long crawl-space runs. If there’s microbial growth inside the old duct, a replacement eliminates it rather than trying to mask it.
We’ll scope the existing system with a camera first. Then you get a written price for the entire replacement. No per-vent games, no surprise invoices at the end. The work is covered by the same 365-Day Done Right Promise.
Full-System Replacement vs. Targeted Repairs
Sometimes the whole system doesn’t need to go. If one zone is crushed and the rest is sound, we’ll replace that run and leave the good duct alone. We’ll tell you which is which. If the duct is original from 1985 and we’re seeing separations in five different places, replacement saves you money over repeated patch jobs.
Duct That’s Beyond Cleaning
When we arrive for what looks like a cleaning job and find collapsed duct, you get the choice on the spot. We’ll show you the camera footage. The decision is yours, and the price is in writing before anything gets replaced.
Trusted Brands We Service in Alamo
We stock and service duct components from the brands HVAC pros in this valley actually use. Our trucks carry insulated flex duct and hard-pipe fittings to match most Alamo estate systems, and our air hygiene equipment includes Nikro negative-air machines and HEPA filtration units. For homes adding air-quality improvements during a repair, we work with Honeywell and Aprilaire filtration products that install directly into the existing system. Because we’re serving Alamo regularly, we don’t have to special-order basic fittings from a warehouse two days out. The truck comes stocked, and the job gets done.
Common Air Duct Repair Problems We See in Alamo Homes
- Collapsed 1980s flex duct in superheated attics. Alamo attics hit 130 – 140°F during the Diablo Valley heat season, and original flex duct from the 1980s has a hard time surviving that for 40 years. We see kinks and separations that choke airflow to entire zones, especially in homes off Stone Valley Road and around the Roundhill Country Club area.
- Microbial growth in crawl-space return runs. Long return ducts running through unconditioned crawl spaces sweat when humid air meets cool duct surfaces. In Alamo’s summer heat-pushed systems, condensation forms, and damp return duct grows microbial contamination. A fogging spray won’t fix it; the source has to be removed or the duct replaced.
- Diablo wind dust and ash saturation. When fall Diablo winds push smoke and fine particulate from East Bay grassland fires across the San Ramon Valley, forced-air systems pull that stuff directly into supply and return ducts. Ash deposits build up inside duct runs, and regular vacuuming without agitation tools misses most of it.
- Imbalanced multi-zone airflow on large floorplans. A 6,000 sq ft Alamo estate with four zones was balanced when it was built. Thirty years of duct degradation, a partial repair here, a kinked return there, and now the upstairs runs 8°F warmer than downstairs. We diagnose zone pressure and airflow to find the actual restriction, not just crank the thermostat.
Pricing for Air Duct Repair in Alamo, CA
Air duct repair in Alamo runs a wide range because the houses here are not cookie-cutter. A simple flex duct patch on a single run starts around $350. Replacing a collapsed 25-foot section of 1980s flex with new insulated duct sits at $700 – $1,100. A full air duct replacement for a 5,000 sq ft multi-zone estate lands between $4,500 and $8,500. The three things that move the price: how much duct has failed, how hard it is to reach in an attic or crawl space, and whether the problem is isolated or systemic. We’ll look at the system, scope it with a camera, and put the full job price in writing before any work starts. Estimates are free. Call (980) 447-2498.
We Also Serve Cities Near Alamo
Our crews move through the San Ramon Valley and the neighboring hills all week. In addition to Alamo, we serve Walnut Creek, Moraga, Lafayette, and Danville. If you’re in one of those cities and need the same written-price, guaranteed Air Duct Repair service we provide in Alamo, call and we’ll schedule the visit.
Serving Alamo, CA - Our Local Coverage Area
We’re based in the Alamo 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 Alamo
Original flex duct in an Alamo attic that hits 130°F+ every summer is on borrowed time. We check with a camera. If one or two runs are kinked or collapsed, we repair or replace those sections for $350 – $1,100 each. If we find separations in five or more runs, microbial contamination throughout, or duct insulation that’s disintegrating, replacement is the honest call, typically $1,800 – $5,500 for most Alamo homes and more for large estates. You see the camera footage and get the price in writing before deciding. Call (980) 447-2498 for a free estimate.
No. Fogging puts a chemical mist over the microbial growth and the smell comes back within weeks. The musty smell from Alamo crawl-space return ducts comes from damp organic material: condensed moisture plus dust plus heat. The fix is source removal with negative-pressure extraction and HEPA filtration, or replacing the affected section entirely if it’s saturated. We don’t sell fogging as a repair. We remove the source, and the smell stays gone.
Three reasons: attic heat, system scale, and duct age. Alamo’s inland-valley heat pocket pushes attics to 130 – 140°F, which accelerates insulation breakdown and flex duct collapse. The homes themselves are much larger on average than a Walnut Creek rancher, which means longer duct runs and more stress per system. And the housing stock here was largely built from the 1970s through the 1990s, so original duct is now 30 – 50 years old. Danville has newer stock on average, which is why we see different failure modes there. If your duct is original and your airflow is weak, call (980) 447-2498 and we’ll scope it.
A real repair includes camera inspection of the failed runs, identification of the actual airflow restriction, replacement or repair of the failed duct sections, and verification that the zone’s static pressure and airflow are back within range. On Alamo estate systems, we also check zone dampers and return paths, because a repair that fixes the supply but ignores a choked return doesn’t solve the problem. It’s all covered by the written 365-day guarantee.
Yes, and more than most people expect. Diablo winds push smoke, ash, and fine particulate from East Bay grassland fires directly into Alamo neighborhoods. Forced-air systems pull that particulate through the return ducts, and the dust that settles inside duct runs in a single fall season can exceed what a coastal home sees in years. The East Bay hills are the fire source, and the inland heat pattern is the delivery system. After a heavy Diablo season, an inspection with the Nikro camera will show you what’s in there. Call (980) 447-2498 to schedule one.
Call Linden Air Duct Cleaning for Air Duct Repair in Alamo
You’ll get a written price before anything starts, a tech whose name and face you’ll know before they arrive, and a repair that’s guaranteed in writing for 365 days. That’s how we do business in Alamo. Call (980) 447-2498 for a free estimate, and talk to a real person who can book your visit.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving Alamo and the San Ramon Valley.