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 Sunnyvale
Air duct repair in Sunnyvale typically runs $275 – $650 for a targeted repair like a separated seam or crushed flex run, while full duct replacement in a 1,400 – 1,800 square foot ranch home usually lands between $2,800 and $5,400 depending on access and system length. Most Sunnyvale repair jobs take one visit, and we schedule within a few days, not weeks. You’ll know the exact price in writing before any work starts. Call (980) 447-2498 to describe what you’re seeing, and we’ll tell you straight what it’ll take to fix it.
We work in Sunnyvale’s older ranch neighborhoods every week. Lakewood, Cherry Chase, Borregas, and the streets off Remington and Hollenbeck. These aren’t drive-by visits for us. We know what’s in those attics because we’ve been inside hundreds of them, and we know the failure patterns these 1955 – 1975 systems share. That matters when you’re deciding between a repair and a replacement.
Why Linden Air Duct Cleaning Is Sunnyvale’s Preferred Air Duct Repair Company
Most Sunnyvale homes we service were built for Lockheed and aerospace families between the late Eisenhower years and the mid-1970s. That means original sheet-metal trunks, early flex connectors, and duct board that’s been sitting in unconditioned attic space for five to seven decades. We’re familiar with what that stock looks like and what fails first. Marcus Veale, who leads our team, has built our repair approach around the specific ways these homes age, because a 1962 Cherry Chase ranch fails differently than a 2008 Santa Clara townhouse.
Every Sunnyvale customer gets the same thresholds before we arrive: a written price before work starts, a background-checked and identity-verified technician whose name and photo are sent ahead, and a photo ID badge shown at the door. That’s what the Threshold Standard means in practice. We don’t send someone you haven’t been introduced to.
Our repair work carries the 365-Day Done Right Promise in writing. If a covered repair doesn’t hold, we come back at no charge. You’re not betting on good intentions. You’re holding a written commitment from a company that’s been part of the Threshold Group family since 2004.
Ductwork Repair in Sunnyvale
Ductwork repair in Sunnyvale is usually about restoring integrity to a system that’s been in place since before most of us were born. The job means locating separated seams, collapsed flex sections, disconnected boots, or sagging runs, then either re-sealing, re-supporting, or replacing the failed section. In Sunnyvale’s ranch homes, we’re often working in attic chases above the original hallway, which means tight access and precise work, not guesswork.
Seam and Joint Failures
Original sheet-metal trunks were assembled with mechanical fasteners and tape that degrades over decades. In Sunnyvale’s marine-layer climate, the seams go first. We inspect with a camera, mark the failures, then re-seal with mastic and reinforced tape rated for that application. The goal is a sealed system, not a patch.
Collapsed and Crushed Flex Runs
Early flex connectors sag under their own weight after 50 or 60 summers in a hot attic. When we open one, it’s often flattened or kinked past the point of any airflow. We replace that section, size it correctly, and support it so it doesn’t happen again in three years.
Duct Replacement in Sunnyvale
Duct replacement in Sunnyvale generally means the existing system is beyond a repair that would last. We see this most often when the original sheet metal has corroded at multiple seams, the insulation jacket is disintegrating, or years of moisture have compromised the interior surface. A full replacement for a typical three-bedroom Sunnyvale ranch runs $2,800 – $5,400, which includes removal, new duct sizing, installation, sealing, and testing.
Full-Trunk Replacement for Heavily Degraded Systems
When a camera inspection shows multiple failures along the main trunk and branch lines, replacing it all is usually cheaper over five years than chasing one repair after another. We give you the assessment plainly. You decide with the full picture.
Partial Replacement for Isolated Damage
Sometimes only one run has failed, crushed during a remodel or separated from a boot. In those cases, we replace just that section to match the existing system’s size and airflow. You pay for what’s actually broken, not a new system you don’t need.
Trusted Brands We Service in Sunnyvale
We service and install equipment across the brands already common in Sunnyvale homes. Our techs work daily with Rotobrush and Nikro equipment for source removal and system cleaning, and we supply air-quality components from Aprilaire and Abatement Technologies when a repair calls for upgraded filtration or antimicrobial treatment. We keep common fittings and materials stocked for Sunnyvale’s older systems, which means fewer second trips for parts. That matters when your ducts are open in July and the furnace blower won’t stop running.
Common Air Duct Repair Problems We See in Sunnyvale Homes
- Separated sheet-metal seams in original trunks. The tape and fasteners used in 1960s construction fail over time, and Sunnyvale’s morning marine layer keeps attic air damp enough to accelerate it. The result is conditioned air bleeding into the attic while dust and insulation get pulled into the system.
- Mildew at duct-board and seam edges. The coastal fog cycle keeps the unconditioned attic chase intermittently damp. That moisture finds its way into fiberglass duct board and old seam tape, and once present, it doesn’t dry out on its own. Repair here means source removal plus antimicrobial treatment, not just re-taping.
- Crushed early flex connectors. The thin flex used in 1960s attic runs sags under decades of heat. By the time we’re called, the run to a back bedroom is often flattened to half its original diameter. The room never cools, and the blower motor works harder than it should.
- Remodel dust forced through the system. When a Sunnyvale ranch gets gut-renovated before sale, ceiling demo drops decades of settled dust directly into open ducts. That dust coats the blower motor, clogs the evaporator coil, and blows drywall particulate through every register. It’s the single most common call we get in Lakewood and Cherry Chase during flip season.
Pricing for Air Duct Repair in Sunnyvale, CA
Targeted ductwork repair in Sunnyvale runs $275 – $650 for most single-failure jobs, a separated seam, a crushed flex run, a disconnected boot. Full duct replacement for a typical ranch runs $2,800 – $5,400 depending on the system’s length and how accessible the attic chase is. If source removal is needed before repair, budget an additional $850 – $1,700, which includes negative-pressure extraction, HEPA filtration, and antimicrobial treatment where the marine-layer moisture has created mildew. We don’t give a teaser price and pad it later. The number we write down before work starts is the number you pay. Call (980) 447-2498 for an exact quote on your system, free.
We Also Serve Cities Near Sunnyvale
Our crews cover Sunnyvale and the surrounding stretch of the South Bay, including Mountain View, Santa Clara, Cupertino, and Los Altos. If you’re in one of those cities and need Air Duct Repair, you’ll get the same written pricing and verification standard. For details on our full local coverage, see Air Duct Repair in Sunnyvale.
Serving Sunnyvale, CA - Our Local Coverage Area
We’re based in the Sunnyvale 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 Sunnyvale
Every 2 to 3 years for most Sunnyvale ranch homes built between 1955 and 1975, and sooner if you’ve had a recent remodel or the fall fire season forced you to run the HVAC for days during high-AQI events. The marine layer keeps attic ducts intermittently damp, and older systems don’t stay clean as long as sealed, newer construction. If you’re seeing dust on registers within weeks of cleaning, you likely have a seam or flex failure that needs repair before cleaning will hold. Call (980) 447-2498 and we’ll tell you what your home actually needs.
That’s usually mildew at the duct-board or sheet-metal seams, fed by the coastal fog cycle that keeps your unconditioned attic chase intermittently damp. The smell lingers because moisture has settled into the porous surfaces inside the ducts, not just the air passing through. A cleaning alone won’t fix it. The affected material needs source removal and antimicrobial treatment, and we’ll identify which seams are the source during the camera inspection. We’ll show you the footage before we do anything.
In almost every case, yes. When ceilings open in a 1960s ranch, six decades of settled dust gets pushed directly into the open ducts. We’ve been called to Cherry Chase homes after remodel crews finished and the registers were spitting drywall dust weeks later. The blower motor and evaporator coil take the worst of it. We run source removal under negative pressure with HEPA filtration, then inspect for any damage the demo caused to the duct system itself. In Sunnyvale’s flip market, this is now a standard line item in pre-sale renovation bids.
Often, we can repair separated seams with mastic and reinforced tape rated for that environment, especially if the failure is localized to one or two joints. If the metal has corroded across multiple seams or the insulation jacket is disintegrating, replacement is usually the honest call. We run a camera inspection and show you exactly what we’re seeing. You’ll know why we’re recommending what we’re recommending, and you’ll have the written price for either path before you decide.
For most older Sunnyvale ranch systems, MERV 8 to MERV 11 is the practical range. Higher ratings can restrict airflow too much for the original blower motors in these 1960s and 1970s systems, forcing them to work harder and shorten their life. If you want higher levels of filtration, we can discuss media cabinets or Aprilaire options that don’t choke the system. We’ll check your blower and static pressure before recommending anything.
Talk to a Real Person About Your Sunnyvale Ducts
If your registers are spitting dust, your back bedroom never cools, or you smell something stale coming through the vents, call us at (980) 447-2498. A live person answers around the clock, no voicemail loops. We’ll talk through what you’re seeing, schedule a visit that works for you, and send the tech’s name and photo before they arrive. Written price first. Written guarantee on every repair. The Threshold Standard every time.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving Sunnyvale and the South Bay since 2004.