Fast, Reliable Duct Repair & Sealing Across Agoura
Duct repair and sealing in Agoura typically costs $180-$650 depending on whether you need spot sealing, flex duct replacement, or full system reconfiguration, and most jobs are completed in a single visit. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to Agoura from our Los Angeles base since 1984 - usually within 90 minutes during business hours, and we answer the phone live 24 hours a day at (844) 685-6342. If your Agoura home has uneven temperatures between rooms, rising energy bills, or you’re still dealing with air quality issues from past fire seasons, we can inspect your ductwork with a camera, show you exactly what’s wrong, and seal or repair it with the price locked in before we start.
Agoura’s housing tells two stories. The original tract developments from the mid-1970s through the early 1990s - particularly around Old Agoura and along Kanan Road - are now hitting 30 to 50 years on their original flex ductwork. That material sags, cracks at the joints, and pulls loose from registers. Meanwhile, post-Woolsey rebuilds on the same streets have brand-new systems that need proper sealing to perform. Our Duct Repair & Sealing team knows both scenarios because we’ve worked them.
Why Bellows Air Duct & Vent Co. Is Agoura’s Preferred Duct Repair & Sealing Company
We’ve been serving Agoura and the surrounding canyon communities for over 42 years. Ray Castillo has led Bellows since the beginning, and our reputation here was built on showing up when we say we will and fixing it so we don’t get called back for the same problem.
Our Agoura customers call us because they’ve learned that ductwork is not a place for guesswork. Every job gets a camera inspection before we touch a tool and another after we’re done. You see what we see. Our 90-Day Done Right Promise means if the seal fails or the repair doesn’t hold, we return at no charge - no paperwork, no arguing. That’s been our policy since 1984.
Response time matters in Agoura, especially during fire season when smoke infiltration can suddenly make a marginal duct system unbearable. We keep our schedule open for same-day and next-day appointments, and a live person answers our phones around the clock. Background-checked, uniformed technicians arrive in marked vehicles, not unmarked vans. And the price we quote on the phone is the price on the invoice - no bait coupons, no changes at the door.
Our Duct Repair & Sealing Services in Agoura
Duct Sealing
Most Agoura homes lose 20 to 30 percent of conditioned air through leaks at joints, seams, and register connections. In the 91301 ZIP code, we see this compounded by decades of thermal cycling in attics that hit 140 degrees in summer. Our duct sealing service uses mastic sealant and metal-backed tape at every joint, followed by a pressure test to verify the seal. We seal metal trunk lines, flex duct connections, and return-air plenums. For homes near the coast where salt air has corroded metal components, we replace degraded fasteners and reseal with materials rated for corrosive environments.
Flex Duct Repair
Flex duct was the standard in Agoura’s 1970s and 1980s construction, and it’s failing now. The insulation sags, the inner liner tears at bends, and the connection collars pull loose from registers. On Kanan Road in Old Agoura, we serviced a 1984 tract home whose flex duct runs had sagged and partially disconnected after decades. The homeowner had never noticed the temperature difference between rooms until we mastic-sealed the joints and re-routed the sagging sections using new 8-inch flex duct from our stock. We carry common sizes on our trucks, so most flex duct repairs in Agoura don’t require a return visit.
Metal Duct Repair
Agoura’s canyon geography channels Santa Ana winds that carry salt air inland farther than in flatter communities. This accelerates corrosion of galvanized metal ductwork, particularly in homes within a few miles of the coast. We repair separated seams, replace rusted sections with new galvanized or stainless-steel duct, and reinforce hanger straps that have corroded through. Every metal repair gets sealed with mastic, not tape alone, because tape fails where salt air concentrates.
Duct Insulation
Attic ductwork in Agoura runs through extreme temperature swings - below freezing on winter mornings, well over 100 degrees by midday in summer. Degraded insulation means you’re paying to heat or cool your attic. We replace damaged insulation with new R-6 or R-8 flex duct, or wrap existing metal lines with foil-faced fiberglass insulation and secure it with proper mechanical fasteners. Proper insulation also reduces condensation that can corrode metal components and support microbial growth in duct linings.
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 Agoura
We stock parts and materials from Abatement Technologies, Rotobrush, and Nikro on every truck serving Agoura. These are the same brands serious HVAC contractors specify, not hardware-store substitutes. For duct sealing, we use professional-grade mastic compounds that remain flexible through decades of thermal cycling. For flex duct replacement, we carry 6-inch, 8-inch, and 10-inch diameter duct with R-6 and R-8 insulation values. Because we stock locally and our technicians are based in the LA area, Agoura customers don’t wait days for parts to ship. Most repairs are completed in a single visit.
Common Duct Repair & Sealing Problems We See in Agoura Homes
- Sagging and disconnected flex duct joints in 30-50-year-old homes. The original ductwork in Agoura’s 1970s-1990s tract housing was secured with plastic straps that degrade in attic heat. Runs sag, kink, or pull completely loose from boots, dumping conditioned air into the attic and starving rooms downstream. We find this in nearly every older home we inspect in the 91301 ZIP code.
- Smoke and ash particulates embedded in duct linings from the Woolsey Fire. The November 2018 Woolsey Fire burned directly through Agoura’s 91301 ZIP code. Homes that survived without structural damage still had smoke, combustion byproducts, and fine ash drawn into return-air grilles during the multi-day event. Standard 1-inch filters do not capture these particles, and they remain embedded in duct lining years later, reducing indoor air quality and accelerating filter loading every fire season since.
- Corrosion of metal duct components from salt-air intrusion. Agoura’s position between the Santa Monica Mountains and the coast means marine layer and salt-laden Santa Ana winds reach farther inland than in neighboring Thousand Oaks or Calabasas. We see rusted hanger straps, corroded seam joints, and degraded register boots in homes even several miles from the beach - failures that flatland communities at similar distances rarely experience.
- Pressure imbalances from poorly sealed new construction. Post-Woolsey rebuilds in Agoura have modern, well-designed duct systems, but builder-grade sealing often fails within the first five years. We perform pressure testing and targeted mastic sealing to bring these systems up to their design efficiency without unnecessary equipment replacement.
Pricing for Duct Repair & Sealing in Agoura, CA
Here’s what duct repair and sealing costs in Agoura’s market:
- Spot duct sealing with mastic (up to 10 joints): $180-$280
- Flex duct repair or replacement (single run, up to 25 feet): $220-$380
- Metal duct section replacement with sealing: $280-$450
- Full duct system sealing and pressure testing: $450-$650
- Duct insulation replacement (per run): $160-$290
These are the numbers we quote before work begins, and they’re the numbers on the invoice. Factors that move costs within these ranges include attic accessibility, the extent of corrosion damage, and whether we need to coordinate with an HVAC contractor for system rebalancing. We offer $50 off any repair over $250, a permanent 5% senior and veteran discount, and free second opinions on any written estimate you’ve received. Call (844) 685-6342 for an exact quote - estimates are free.
We Also Serve Cities Near Agoura
Our service area covers Agoura and the surrounding communities including Agoura Hills, Oak Park, Thousand Oaks, and Calabasas. Each of these cities has distinct ductwork challenges - from Oak Park’s similar vintage housing stock to Calabasas’s larger custom homes with complex zoning systems. We carry the inventory and local knowledge to handle them all.
Serving Agoura, CA - Our Local Coverage Area
We’re based in the Agoura 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 Agoura
Yes - surviving without structural damage does not mean your ductwork escaped harm. Smoke and combustion byproducts were drawn into your return-air system for days while the fire surrounded the neighborhood, depositing particulates in duct lining that standard filters cannot remove. We recommend a camera inspection to assess whether smoke residue has degraded your duct surfaces or created airflow restrictions. Call (844) 685-6342 to schedule - estimates are free.
Agoura sits in a natural wind corridor between the Santa Monica Mountains and Simi Hills that concentrates Santa Ana wind events and drives wildfire smoke and chaparral particulates into home return-air intakes at higher intensity than in Thousand Oaks or Calabasas. Even in years without local fires, this topographic channeling means ductwork here accumulates regional smoke residue faster. We size filtration recommendations and inspection schedules accordingly for Agoura homes.
Repair is often sufficient if the inner liner is intact and the damage is limited to sagging, disconnected joints, or localized tears. We can re-route, support, and seal existing flex duct for significantly less than full replacement. However, if the liner is brittle, extensively torn, or the insulation is saturated with old smoke residue, replacement with new R-6 or R-8 flex duct is the better long-term value. We’ll show you the camera footage and give you both options with upfront pricing.
We use water-based mastic compound for all permanent duct sealing, supplemented with metal-backed tape at high-stress joints. Mastic remains flexible through decades of thermal cycling and creates a true airtight seal, unlike duct tape which degrades in attic heat. For Agoura’s salt-air exposure, we select mastic rated for corrosive environments and replace any corroded fasteners with stainless-steel hardware before sealing.
Homes in the 91301 ZIP code that were exposed to the 2018 Woolsey Fire should be inspected every two to three years, particularly if occupants experience increased allergy symptoms, frequent filter changes, or persistent odors during Santa Ana wind events. Homes built or fully rebuilt since the fire should follow a standard five-year inspection cycle unless fire season exposure has been severe. We document each inspection with camera footage so you can compare year over year. Call (844) 685-6342 to schedule your next inspection.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Agoura since 1984.