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 Duct Sealing Across Dublin
Duct sealing in Dublin, CA typically runs $800 – $2,400 for whole-system work, with most single-zone repairs falling between $1,200 and $1,800. We’re usually in and out in one day, and you’ll know the exact price before we touch anything. If your upstairs registers have gone weak or your energy bills have climbed without explanation, the problem is often gaps in the duct runs themselves, not the HVAC unit. Call us at (361) 326-5060 for a free estimate.
We’ve worked Dublin homes long enough to know the two stories this town tells. Downtown’s mid-century ranches carry original galvanized metal ducts that have shifted with decades of Tri-Valley clay soil movement. Out in Dublin Ranch and East Dublin, the 1990s and 2000s subdivisions hide flex duct under R-30 blown-in insulation in low-slope attics, where inner liners tear and collapse where no homeowner can see. Our crews dispatch from the San Francisco Bay Area office and carry both rotary brush systems for rigid metal and soft-brush tools for delicate flex, plus inspection cameras for those tight, insulated chases. Whether you’re off Amador Valley Boulevard or deep in the east-side planned units, we know what we’re walking into.
Why Hollis Air Duct Cleaning Is Dublin’s Preferred Duct Sealing Company
Hollis has been part of the Garrison Partners family since 2004, and our Dublin customers know we price in writing before any work starts. That matters in a market where bait-and-switch duct cleaning offers are common. Our 365-Day Done Right Promise means if the seal fails or airflow drops, we come back at no charge, including a free second visit. No negotiation, no runaround.
Our technicians are background-checked and uniformed, and we follow The Garrison Code on every job: arrive inside the quoted window, price in writing, complete the work by the book, leave the site clean. Phones are answered by a live person 24 hours a day, 7 days a week. Dublin homeowners aren’t left in voicemail loops or waiting until Monday for a callback.
We know the local conditions. The Diablo Range fire season pushes wildfire smoke into return-air systems. Clay soils shift slabs and separate duct joints. East Dublin’s buried flex duct deteriorates out of sight. This isn’t generic territory for us. We’ve sealed ducts on Dublin Ranch courts, in downtown ranches near the original village, and throughout the east-side subdivisions where attic access means moving carefully through blown-in insulation.
Duct Repair in Dublin
Duct Repair in Dublin often starts with a homeowner noticing weak airflow in one room, or a sudden spike in PG&E bills that the HVAC technician can’t explain at the condenser. The real problem is frequently in the runs themselves: separated joints, crushed flex, or galvanized metal that’s pulled apart as the slab shifted. We inspect with cameras first, then quote a written price before touching anything.
A typical duct repair in Dublin runs $450 – $1,200 for isolated joint separation or partial flex replacement, with more extensive multi-zone work reaching $1,500 – $2,800. The final cost depends on how much of the run is accessible and whether we’re working in a tight east Dublin attic or a downtown crawlspace.
Galvanized Metal Separation
In downtown Dublin’s post-WWII ranches, unlined galvanized ducts have spent decades expanding and contracting with every heating and cooling cycle. Tri-Valley clay soil swells when wet and shrinks in drought, so slabs move and duct joints separate. We bridge these gaps with metal sleeves and seal with mastic and mesh, not tape that will fail in six months.
Crushed Flex Replacement
When flex duct collapses under insulation or gets compressed by workers in an attic, airflow drops to a trickle. We replace the damaged section with new insulated flex, support it properly so it won’t sag, and seal all connections. In Dublin Ranch’s low-slope attics, this means working carefully around existing R-30 without disturbing more than necessary.
Air Duct Sealing in Dublin
Air Duct Sealing in Dublin is the systematic closure of leaks, gaps, and disconnected joints in your supply and return ductwork. We use mastic, fiberglass mesh, and mechanical fasteners, not foil tape that degrades. The goal is simple: the air your HVAC produces should reach the rooms it’s meant to serve, not dump into your attic or crawlspace.
Whole-system air duct sealing in Dublin typically costs $1,200 – $2,400, with smaller partial-system work starting around $800. We verify our work with pressure testing where accessible, so you see the improvement in static pressure and airflow, not just a promise.
Blower-Door-Assisted Verification
After sealing, we run a pressure check to confirm the leaks we found are actually closed. This isn’t guesswork. In Dublin homes with vaulted ceilings and buried duct runs, verification matters because you can’t eyeball every joint. We show you the before and after numbers.
Post-Seal Airflow Balancing
Once the ducts are sealed, we check register airflow room by room. In east Dublin’s larger homes with long supply runs, balancing dampers often need adjustment after sealing restores pressure. The master suite should get the same force as the downstairs family room.
Trusted Brands We Service in Dublin
We stock parts and filtration products from Honeywell, Aprilaire, and Abatement Technologies for Dublin customers, which means faster turnaround when your system needs compatible components after sealing work. Our equipment roster includes Nikro negative-air machines for source removal when ducts are contaminated before sealing, and Rotobrush rotary systems for the metal ductwork common in Dublin’s older homes. We don’t show up hoping the local supply house has what we need. We carry it.
Common Duct Sealing Problems We See in Dublin Homes
- Collapsed flex runs under blown-in insulation. In Dublin Ranch and East Dublin subdivisions, original flex duct from the 1990s and 2000s deteriorates where homeowners can’t see it. The inner liner tears, the insulation sleeve compresses, and airflow to upstairs rooms drops to a whisper. We find these with inspection cameras and replace the full run, not just patch the visible end.
- Galvanized joint separation from slab movement. Dublin’s clay soils shift with seasonal moisture changes, and downtown’s mid-century ranches have paid the price for decades. Original unlined metal ducts separate at joints, dumping conditioned air into crawlspaces. We sleeve and seal these gaps properly.
- Wildfire smoke ash infiltration. When Diablo Range fires send smoke into the Tri-Valley, fine ash penetrates return-air systems and coats duct interiors. Standard filters miss it. Sealing alone won’t remove existing contamination, so we source-remove with Nikro negative-air equipment before sealing gaps that would let it happen again.
- Improper original sealing with failing tape. Many Dublin homes were built with duct joints wrapped in foil tape that degrades in attic heat. We remove the old tape entirely and seal with mastic and mesh, which lasts the life of the duct.
Pricing for Duct Sealing in Dublin, CA
Here’s what duct sealing costs in Dublin’s market:
- Partial system sealing (single zone, accessible attic): $800 – $1,400
- Whole-system sealing with pressure verification: $1,200 – $2,400
- Duct repair with isolated flex replacement: $450 – $1,200
- Multi-zone repair with extensive flex replacement: $1,500 – $2,800
What moves the price: attic accessibility, how much of the ductwork is buried under insulation, whether we’re sealing metal or replacing deteriorated flex, and whether we need to run full source removal before sealing. We give you one flat price per system, agreed in writing before work starts. No per-vent pricing, no add-ons at the door. Every Dublin job includes before-and-after photos of your own ducts, so you see what was done. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Dublin
Our crews handle Duct Sealing throughout the Tri-Valley and surrounding communities. We regularly work in Hayward, San Ramon, Pleasanton, and Danville, and we understand how each city’s housing stock and soil conditions change the job. Duct Sealing in Dublin remains our focus on this page, but if you’re in a neighboring city with similar duct issues, we cover those too.
Serving Dublin, CA - Our Local Coverage Area
We’re based in the Dublin 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 Duct Sealing in Dublin
Duct sealing can fix it if the flex runs are intact but leaking at joints; if the inner liner is torn or crushed, you’ll need partial duct replacement. We inspect with a camera first to tell the difference, then quote a written price for whichever path applies. Call (361) 326-5060 and we’ll schedule a look.
Clay soil swells and shrinks with moisture, shifting slabs and pulling apart galvanized duct joints in downtown’s mid-century ranches. Sealing these homes means bridging slab-shift gaps with metal sleeves and mastic, not just taping surface leaks. The ground movement here is ongoing, so we build repairs to flex slightly without failing.
No. Sealing prevents future infiltration but does not remove ash already inside. We source-remove contamination with Nikro negative-air equipment first, then seal the gaps that let smoke in. The two steps together solve the problem; either one alone leaves you with lingering odor or recurring contamination.
Duct sealing closes leaks in intact ductwork; duct repair fixes physical damage like separated joints, crushed flex, or torn inner liners. In Dublin, we often do both: repair the crushed or separated runs, then seal all accessible joints. We quote each separately so you know exactly what you’re paying for.
Yes. Our sealing methods follow NADCA guidelines for mechanical fastening, mastic application, and pressure verification. In Dublin’s tight east-side attics with low clearance and buried flex, this means working carefully to avoid compressing insulation or damaging adjacent runs while still achieving full seal coverage.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Dublin and the Tri-Valley since 2004.