Fast, Reliable Duct Repair & Sealing Across Van Nuys
Duct repair and sealing in Van Nuys typically costs between $280 and $750 for most residential jobs, with smaller mastic-seal repairs starting around $180 and full flex duct replacement in older homes reaching $900–$1,400. Most Van Nuys homeowners see same-day or next-day scheduling, and Richard Anderson personally leads every repair call — you’ll know exactly who’s in your home. Call (833) 958-5022 for a free estimate.
We’ve been driving the 405 and 101 corridors to Van Nuys for 14 years, and we know the neighborhood’s duct problems aren’t like Sherman Oaks or Encino. The postwar ranch homes along Victory Boulevard, the apartment blocks near Van Nuys Boulevard, the 1960s tracts tucked behind the Orange Line — they each carry a specific legacy of original ductwork, Valley heat damage, and the aftermath of ’94 earthquake repairs that were never properly finished. When your bedroom’s been 85 degrees in July or your energy bill’s climbing while airflow drops, that’s usually not a new problem. It’s an old one finally breaking through.
Why Landmark Air Duct Cleaning Service California Is Van Nuys’s Preferred Duct Repair & Sealing Company
Richard Anderson shows up — not a crew you’ve never met. Our Duct Repair & Sealing team handles every Van Nuys job with the same direct accountability that’s earned us a 4.9-star average across 364+ verified customer reviews. Homeowners from Valley Glen to North Hollywood can verify that consistency themselves.
We know Van Nuys’s ZIP codes — 91408, 91409, 91410, 91411 — and the specific housing stock inside them. The 1950s–1970s single-family ranches with original sheet-metal trunk lines. The low-rise apartment complexes along corridors like Van Nuys Boulevard where ductwork has passed through four ownership changes without proper service. The post-Northridge flex duct patch jobs that are finally failing after thirty years.
Our response time to Van Nuys is typically same-day or next-day because we’re based in Bell, CA — close enough for quick dispatch, far enough that we don’t waste your time with scheduling games. Richard brings 14 years of focused air-duct specialization, not generalist handyman work that added ducts as an afterthought. Professional Rotobrush and Nikro systems — the same rotary brush and negative-air extraction equipment commercial restoration contractors use — not a shop vac and a sales pitch.
Our Duct Repair & Sealing Services in Van Nuys
Duct Sealing with Mastic Sealant
Van Nuys’s brittle fiberglass duct board from the 1960s and 1970s doesn’t handle tape well — the adhesive fails, the board crumbles, and you’re left with leaks that dump conditioned air into your attic or walls. We use professional-grade mastic sealant, applied with proper technique for earthquake-damaged joints and heat-cycled duct board. A typical mastic sealing job in Van Nuys runs $280–$450 for a single-family home with accessible attic ductwork. Mastic remains flexible after curing, which matters in a seismic zone where vibration and minor settling continue.
Flex Duct Repair & Replacement
The post-Northridge repair legacy hits hardest here. We’ve found flex duct in Van Nuys homes that was installed in 1994 with mismatched diameters, no proper support straps, and duct tape that’s turned to powder. Sagging flex creates low points where insulation debris compacts and airflow chokes. We replace failed flex sections with properly supported R-8 insulated duct, sized correctly to the original trunk line. Typical flex duct repair in Van Nuys: $320–$680 for partial replacement, $750–$1,200 for full trunk-line reconnection with proper support.
Metal Duct Repair
Those original sheet-metal trunk lines in Van Nuys’s ranch homes? Often still structurally sound. The problem is disconnected joints, corroded hangers, and decades of vibration working seams loose. We repair metal ductwork with proper mechanical fastening and mastic sealing — preserving the original trunk when it’s viable, which saves you money over full replacement. Metal duct repair in Van Nuys typically runs $350–$650 for joint reconnection and sealing, $600–$950 if hanger replacement and section patching is needed.
Duct Insulation
Van Nuys’s 105–112°F summer highs cook uninsulated attic ductwork. R-4 or R-6 insulation from the 1970s has degraded to near-zero effectiveness in many homes we see. We install R-8 insulated flex or wrap existing metal with proper insulation barriers. Duct insulation in Van Nuys runs $400–$800 for typical ranch-home attic runs, with faster payback than you’d expect given how hard your system works June through September.
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 Van Nuys
We stock parts and materials from Honeywell, Guardsman, and Rotobrush systems for Van Nuys customers — no waiting on special orders for common repairs. Honeywell media filters and electronic air cleaners integrate with sealed duct systems for the full indoor air quality picture. Guardsman antimicrobial treatments address the contamination that builds up in leaky Van Nuys ductwork over decades. Our Rotobrush rotary brush systems clean before we seal, because sealing dirty ducts just traps the problem. We don’t sell brands we don’t trust, and we don’t install equipment we can’t service.
Common Duct Repair & Sealing Problems We See in Van Nuys Homes
- Brittle fiberglass duct board crumbling under vibration. The 1960s–1970s homes near Van Nuys High School and along Victory Boulevard often have original duct board that’s turned to chalk near attic access panels. Foot traffic, seismic vibration, and sixty years of 100°F+ attic temperatures break it apart. We find pieces blocking dampers and coating evaporator coils.
- Post-Northridge flex duct repairs with failed connections. The 1994 earthquake jolted loose ductwork throughout Van Nuys, and many repairs were done fast with cheap flex duct and duct tape. That tape has failed. The mismatched diameters leak. Sagging sections collect debris at low points. We regularly pull apart repairs that were “good enough” in 1995 and are now dumping conditioned air into wall cavities.
- Original sheet-metal trunk lines wrapped in unsealed flex repairs. In apartment buildings along Van Nuys Boulevard and adjacent corridors, we find 1960s rigid duct still intact but smothered in layers of flex repairs from multiple maintenance cycles. None of it sealed properly. Conditioned air leaks into attic spaces through every disconnected joint. The trunk line is salvageable; the wrapping isn’t.
- Extreme heat cycling accelerating seal failure. Van Nuys’s basin geography traps heat. Your attic hits 140°F in August. Duct sealants, tapes, and insulation degrade faster than in coastal LA. What lasted twenty years in Santa Monica fails in twelve here. We use materials rated for San Fernando Valley temperature extremes.
Pricing for Duct Repair & Sealing in Van Nuys, CA
| Service | Typical Range in Van Nuys |
|---|---|
| Mastic sealant application (accessible ductwork) | $180 – $340 |
| Partial flex duct repair/replacement | $320 – $680 |
| Metal duct joint repair and sealing | $350 – $650 |
| Full flex duct replacement with proper support | $750 – $1,200 |
| Duct insulation upgrade (R-8) | $400 – $800 |
| Comprehensive sealing + repair package | $900 – $1,400 |
What moves you up or down in these ranges: attic accessibility (tight trusses add labor), extent of earthquake-damage repairs needed, whether we can preserve original metal trunk lines or need partial replacement, and contamination level requiring pre-seal cleaning. We don’t quote over the phone for complex jobs — we inspect, photograph what we find, and give you a written estimate before any work starts. Estimates are free. Call (833) 958-5022 to schedule.
We Also Serve Cities Near Van Nuys
Our service radius covers Valley Glen to the east, Sherman Oaks to the south, Encino to the southwest, and North Hollywood to the southeast. Each has different housing stock and different duct problems — Valley Glen’s 1980s construction, Sherman Oaks’s hillside homes with crawl-space ductwork, Encino’s larger estate systems, North Hollywood’s mixed vintage of apartments and bungalows. Richard Anderson leads every job regardless of zip code.
Serving Van Nuys, CA — Our Local Coverage Area
We’re based in the Van Nuys 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 Van Nuys
Check your attic for rectangular, yellowish-tan duct channels that crumble when touched — original fiberglass duct board in Van Nuys’s 1950s–1970s homes typically shows chalking, surface cracking, or visible fiber shedding near joints and access panels. If your system was installed before 1980 and you’ve never had ductwork replaced, you likely have it. Call (833) 958-5022 and we’ll confirm with a no-charge inspection.
Usually yes — the original sheet-metal trunk lines in Van Nuys apartment buildings are often structurally sound; the problem is the unsealed flex wraps and disconnected joints around them. We remove the failed flex layers, reseal the metal trunk with mastic, and install properly supported, correctly sized flex where needed. Most apartment duct repairs in Van Nuys run $450–$850 depending on unit count and attic access. Call for a specific quote — estimates are free.
Yes — mastic sealant outperforms duct tape for Van Nuys’s specific conditions because it remains flexible after curing, adheres to heat-cycled and slightly irregular surfaces, and doesn’t degrade under the vibration and temperature swings that characterize this seismic zone. Duct tape in Van Nuys attics typically fails within 3–5 years; properly applied mastic lasts 15–20+. We use mastic on every earthquake-legacy repair we touch.
Upstairs heat in Van Nuys usually traces to ductwork design issues compounded by extreme attic temperatures — insufficient return air path, undersized supply runs, or flex duct that’s sagging and choking airflow to the second floor. The San Fernando Valley’s 105–112°F summers amplify any duct deficiency. We measure static pressure and airflow at each register to distinguish duct problems from insulation gaps or system sizing issues. Call (833) 958-5022 for diagnostic service.
Yes — metal duct repair is a core service we emphasize for Van Nuys’s 1950s–1970s ranch homes, where original sheet-metal trunk lines often remain viable but need joint resealing, hanger replacement, and corrosion patching. Preserving original metal saves $400–$800 over replacement in typical Van Nuys jobs. Richard Anderson assesses each trunk line for structural integrity and gives you straight guidance on repair versus replacement.
Ready to Fix Your Van Nuys Ductwork? Call for a Free Estimate
Fourteen years focused on one trade: cleaner air, cleaner ducts. Richard Anderson personally leads every Van Nuys repair call, from the first inspection to the final mastic application. No anonymous crews. No subcontractor handoffs. Just direct accountability and work you can verify through 364+ customer reviews.
If your Van Nuys home has brittle fiberglass duct board, post-Northridge flex repairs that are finally failing, or rooms that never cool evenly, we’ll diagnose it honestly and fix it properly. Call (833) 958-5022 today for your free estimate — we’re typically scheduling same-day or next-day for Van Nuys calls.
Written by Richard Anderson, Owner at Landmark Air Duct Cleaning Service California, serving Van Nuys and the San Fernando Valley since 2010.