Fast, Reliable Duct Repair & Sealing Across Los Gatos
Most duct repair companies in the South Bay are built for flat lots and tract homes. We’re not. Our Duct Repair & Sealing crew makes the long drive up to the 95033 mountain zone, hauls gear down steep service roads, and fixes systems that were never standard to begin with. If you live on Redwood Retreat Road, off Old Santa Cruz Highway, or in the foothills above Lexington Reservoir, you already know - one trip is all you get, because nobody wants to make that climb twice. We bring mastic, clamps, insulation, and the right flex duct in the truck. One visit. Done right. Call (844) 685-6342.
Why Bellows Air Duct & Vent Co. Is Los Gatos’s Preferred Duct Repair & Sealing Company
We’ve been driving to Los Gatos since 1984. Ray Castillo built this company on showing up when we say we will, and that matters more in the hills than anywhere else. When your driveway is half a mile of gravel switchback and your furnace is acting up on a January night, you need a crew that doesn’t get lost, doesn’t call for directions, and doesn’t reschedule because the truck wasn’t loaded for mountain work.
Our technicians are background-checked, uniformed, and carry camera inspection gear from Rotobrush and Nikro. Every job gets photographed before and after - you’ll see the disconnected flex joint, the smoke-stained duct interior, the sealed result. No claims without proof.
We answer calls with a live person, 24 hours a day. Not an app. Not a callback queue. A real voice, and a real appointment.
Our 90-Day Done Right Promise applies to every Los Gatos job. If it’s not right, we return at no charge. No paperwork. No arguing. We stand behind it.
Our Duct Repair & Sealing Services in Los Gatos
Duct Sealing with Mastic Sealant
Los Gatos’s mountain-interface microclimate - higher rainfall, heavier pollen from live-oak woodland, and recurring wildfire smoke - forces ductwork to work harder than systems in dry Campbell or Saratoga. Standard foil tape degrades fast here, especially in detached workshops where ozone from heavy-duty equipment accelerates breakdown. We seal with professional-grade mastic, brushed into every joint and wrapped with mesh. In the 95033 zone, we often find original cabin ductwork that was never properly sealed at all. We fix that.
Flex Duct Repair
The hillside soil movement in Los Gatos’s upper foothills is real and ongoing. We’ve replaced flex duct in homes off Black Road and along the Summit Road corridor where joints pulled apart over years of subtle ground creep. Cheap original installs - common in 1970s vacation cabins later converted to full-time homes - used undersized support straps and uninsulated flex that sags, tears, and disconnects. We install properly sized flex with metal sleeves, stainless steel clamps, and reinforced hangers rated for seismic zone conditions. This is not a valley repair. It requires different material and more labor.
Metal Duct Repair
The pre-WWII craftsman bungalows in Los Gatos’s historic downtown core - 95030 - often contain original galvanized metal duct from the 1940s or 1950s. It’s rusted at the seams, sometimes patched with decades of homeowner tape jobs. We cut out damaged sections, fabricate replacement runs on site, and seal with mastic. Where original metal is sound, we preserve it. Where it’s compromised, we replace. No blanket recommendations - we inspect with cameras first.
Duct Insulation
Cathedral ceilings and bonus rooms over garages are common in Los Gatos custom homes from the 1980s and 1990s. The ductwork in these spaces was frequently installed without adequate insulation, or with insulation that has compressed and degraded. In Los Gatos’s humid mountain microclimate, cold supply ducts sweat. That moisture breeds mold. A seal alone won’t solve it. We remove degraded insulation, treat affected areas, and reinstall with proper R-value vapor-barrier insulation. We see this pattern repeatedly in the hillside neighborhoods above Shannon Road and around the Los Gatos High School zone.
What happens when you call
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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 Los Gatos
We stock parts and specify equipment from Rotobrush, Nikro, and Abatement Technologies - the same brands serious HVAC contractors use, not consumer-grade hardware store stock. For Los Gatos customers, this means faster turnaround. When we’re already driving 35 minutes to a 95033 mountain property, we don’t call back for parts. The truck carries mastic rated to 350°F for wood-stove-adjacent runs, stainless steel clamps for seismic zones, and multiple flex duct diameters. Most jobs complete in a single visit because we planned for what we’d find.
Common Duct Repair & Sealing Problems We See in Los Gatos Homes
- Disconnected flex-duct joints in 95033 mountain homes. Decades of hillside soil creep pull apart connections that were never properly secured. Conditioned air vents directly into crawlspaces. Homeowners notice weak airflow and rising energy bills before they locate the problem.
- Uninsulated ductwork in cathedral-ceiling bonus rooms. Los Gatos’s humid mountain microclimate causes sweating on cold supply lines. Mold follows. Basic sealing ignores the root cause. Proper insulation is required.
- Wood-smoke residue accumulation in cabin-conversion homes. Many 95033 properties relied on wood stoves before SoCalGas service arrived. Ductwork near these heat sources carries heavy particulate loads and creosote-like deposits that standard cleaning won’t remove. Specialized agitation and high-temperature sealing materials are necessary.
- Pollen infiltration through degraded workshop duct seals. Los Gatos’s live-oak and mixed-chaparral woodland generates intense seasonal pollen. Detached workshops with aging duct systems pull this load directly into the house. Complete mastic sealing of the entire run, not just spot repairs, solves it.
Pricing for Duct Repair & Sealing in Los Gatos, CA
We show you the price before we lift a tool. No bait coupons, no changes at the door.
| Service | Typical Range in Los Gatos |
|---|---|
| Single joint mastic sealing (accessible) | $180-$260 |
| Flex duct repair / replacement (per run) | $340-$580 |
| Metal duct section replacement | $420-$720 |
| Duct insulation removal and replacement | $560-$940 |
| Whole-system seal (average 12-18 joint home) | $1,200-$1,800 |
Mountain-zone homes in 95032 and 95033 often run higher due to multi-level duct runs, limited access, and the additional labor of hauling materials on steep lots. We tell you this on the phone, not after we arrive. Estimates are free. Call (844) 685-6342.
Standing offers: $50 off any repair over $250. Free second opinion on any written estimate. Permanent 5% senior and veteran discount.
We Also Serve Cities Near Los Gatos
Our Duct Repair & Sealing in Los Gatos coverage extends to Saratoga, Campbell, San Jose, and Cupertino. Mountain properties take priority in our routing - we know the roads, the access issues, and the building stock. Valley customers receive the same one-trip standard, with shorter drive times.
Serving Los Gatos, CA - Our Local Coverage Area
We’re based in the Los Gatos 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 - Duct Repair & Sealing in Los Gatos
Yes. We use high-temperature mastic rated to 350°F and Rotobrush agitation to remove creosote-like deposits before sealing. Wood-stove residue in converted cabin homes is a specialized condition we encounter regularly in the 95033 zone - standard cleaning and sealing materials will fail here. Call (844) 685-6342 for a free inspection and exact quote.
Yes. We replace failed connections with metal sleeves, stainless steel clamps, and reinforced hangers designed for seismic and soil-movement conditions. The original installs in 1970s cabin conversions used undersized straps that sag and tear - our method addresses the root cause, not just the symptom. Most flex duct repairs in Los Gatos run $340-$580 per run. Call for an estimate - we’ll inspect with cameras first.
Yes. We remove degraded or compressed insulation, treat any mold-affected areas, and reinstall proper R-value vapor-barrier insulation. Cathedral-ceiling ductwork in Los Gatos’s humid microclimate requires this full treatment - sealing alone won’t stop sweating and mold recurrence. Estimates are free; call (844) 685-6342.
Yes. Complete mastic sealing of the entire duct run, including all joints and the connection to the main house system, prevents pollen infiltration. In Los Gatos’s live-oak woodland, partial repairs fail quickly - the pollen load is too heavy for spot fixes. We seal it once, completely. Call for a free estimate.
We route mountain calls with extended drive time built in, and our trucks carry full inventory for one-trip completion. Our crew knows the access roads - Redwood Retreat, Black Road, Summit Road corridors - and we don’t reschedule due to distance. Live dispatch answers 24/7, and we quote honest arrival times upfront. For emergency duct repair in 95033, call (844) 685-6342.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Los Gatos since 1984.