Fast, Reliable Duct Repair & Sealing Across North Hollywood
Duct repair and sealing in North Hollywood typically costs $180-$650 depending on whether you’re sealing accessible joints or replacing earthquake-damaged flex runs, and most of our jobs are completed in a single visit. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to the Valley since 1984 to fix ductwork that other companies won’t touch. If your North Hollywood home was built between the 1950s and 1980s, there’s a fair chance your ducts have been leaking since before you moved in. Call (844) 685-6342 for a free estimate with upfront pricing, or keep reading to see what we find in local homes.
Why Bellows Air Duct & Vent Co. Is North Hollywood’s Preferred Duct Repair & Sealing Company
We’ve worked the 91605, 91606, 91609, and 91611 zip codes long enough to know which apartment complexes on Magnolia Boulevard still have original flex duct from 1968, and which ranch-style homes off Burbank Boulevard have thin sheet-metal runs that corroded decades ago. North Hollywood customers call us back because we show them the problem before we quote the fix. Every job starts and ends with a camera inspection, so you see what we see, not just take our word for it.
Our technicians are background-checked, uniformed, and trained to work in the tight attic crawlspaces common to North Hollywood’s dense housing stock. We answer our phones with a live person 24 hours a day, and we schedule North Hollywood appointments with realistic arrival windows, not four-hour guesses. The 90-Day Done Right Promise applies to every repair we make in North Hollywood: if it’s not right, we return and make it right, no paperwork, no arguing.
Our Duct Repair & Sealing Services in North Hollywood
Duct Sealing
Sealing is the foundation of what we do in North Hollywood. The combination of earthquake-loosened joints, decades of thermal cycling, and original construction that never included proper mastic application means most local duct systems leak 20-30% of their conditioned air before it reaches the vents. Our Duct Repair & Sealing crew applies professional-grade mastic sealant and reinforced tape at every joint, boot, and penetration, then verifies the seal with a camera inspection. For a typical North Hollywood single-family home, duct sealing runs $350-$550 and usually takes three to four hours.
Flex Duct Repair
Flex duct is everywhere in North Hollywood’s post-WWII apartment stock, and it’s often the first thing to fail. The 1994 Northridge earthquake snapped connections, crushed runs in tight framing, and left sections pulling dusty attic air into bedrooms for 30 years. In a 1960s dingbat complex on Magnolia Boulevard, our crew used a Rotobrush camera to find a flex duct that snapped apart during the 1994 quake. We reconnected it with mastic sealant and metal strapping, restoring airflow and sealing off the dusty attic air that had been pulling into the bedroom for 30 years. Flex duct repair in North Hollywood typically costs $180-$340 per section.
Metal Duct Repair
The modest ranch homes scattered through North Hollywood’s residential blocks often carry original thin-gauge sheet-metal ductwork from the 1950s and 1960s. These systems weren’t designed for the static pressure of modern air conditioning, and the seams corrode from decades of condensation cycling. We repair metal ducts by re-seaming with proper slip joints and locking tabs, then sealing with mastic. When sections are too far gone, we fabricate replacements on-site. Metal duct repair in North Hollywood generally runs $280-$480.
Duct Insulation
North Hollywood’s summer heat, regularly exceeding 105°F in the deepest part of the Valley heat pocket, turns uninsulated attic ducts into ovens. By the time cooled air travels through a 140°F attic, it’s gained ten degrees or more. We install foil-faced fiberglass insulation or closed-cell wrap on accessible duct runs, bringing them up to current Title 24 standards. Duct insulation in North Hollywood typically costs $400-$750 for a complete attic system.
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 North Hollywood
We carry parts and materials from Aprilaire, Abatement Technologies, and Rotobrush, the same brands serious HVAC contractors specify for commercial jobs. For North Hollywood homeowners, that means we don’t wait on special orders for mastic sealants, flex duct connectors, or register boots. We stock what local housing stock requires, so most repairs finish the same day we arrive. Our Rotobrush camera systems let us document every North Hollywood job with before-and-after footage you can keep.
Common Duct Repair & Sealing Problems We See in North Hollywood Homes
- Earthquake-loosened duct joints in post-1994 buildings remain disconnected, wasting energy and pulling attic contaminants indoors. The 1994 Northridge earthquake, epicentered roughly five miles away in Reseda, jarred loose thousands of duct connections across North Hollywood. Many were never professionally inspected, let alone repaired. We still find boots hanging open in wall cavities, blowing conditioned air into spaces no one lives in.
- Flex ducts in tight attic crawlspaces behind townhome rows get pinched or crushed during maintenance, restricting airflow. North Hollywood’s dense apartment and townhome construction leaves technicians working in spaces eighteen inches high or less. Flex duct gets kinked around framing, compressed by storage boxes, or flattened where someone stepped wrong years ago.
- Original thin sheet-metal ducts in 1950s ranches have corroded seams that leak under high-static pressure from modern AC units. Those ranch homes off Burbank Boulevard and Vineland Avenue weren’t built for central air. When homeowners added AC decades later, the existing ductwork couldn’t handle the pressure. Seams split, collars separate, and the system leaks into the attic.
- Santa Ana winds and wildfire smoke load ductwork with particulates that accelerate seal degradation. The San Fernando Valley basin traps pollution from Angeles National Forest fires and Simi Hills burns, plus desert dust blown in by seasonal Santa Ana winds. These contaminants abrade duct surfaces and clog filters, forcing systems to work harder and leak more.
Pricing for Duct Repair & Sealing in North Hollywood, CA
| Service | Typical Range in North Hollywood | Most Common Job |
|---|---|---|
| Duct sealing (whole system) | $350-$550 | $420 |
| Flex duct repair (per section) | $180-$340 | $260 |
| Metal duct repair (per section) | $280-$480 | $380 |
| Duct insulation (attic system) | $400-$750 | $580 |
| Mastic sealant touch-up (localized) | $180-$280 | $220 |
These are the numbers we give North Hollywood homeowners before we start. No bait coupons, no price changes at the door. Several factors can move you within or above these ranges: accessibility of your attic or crawlspace, the extent of earthquake damage, whether we need to cut access panels, and whether your system requires additional return air modifications. We offer $50 off any repair over $250, a free second opinion on any written estimate you’ve received, and a permanent 5% senior and veteran discount. Call (844) 685-6342 for an exact quote on your North Hollywood home, estimates are free.
We Also Serve Cities Near North Hollywood
Our Duct Repair & Sealing in North Hollywood team lives and works in the Valley, so we’re never far from Valley Village, Studio City, Universal City, or Burbank. Same live-answer phones, same camera inspections, same 90-Day Done Right Promise. If you’re in one of these neighboring cities and your ducts haven’t been inspected since the 1990s, we should talk.
Serving North Hollywood, CA - Our Local Coverage Area
We’re based in the North Hollywood 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 North Hollywood
Yes, it’s likely. In our experience across North Hollywood’s 1960s apartment stock, roughly half the units we inspect have duct connections that were jarred loose in January 1994 and never reconnected. The damage is nearly invisible without a camera inspection, which is why we include one on every job. If your bedroom feels stuffy despite the AC running, or if you’ve noticed dust accumulation around ceiling registers, that’s often the tell. Call (844) 685-6342 and we’ll check it, no charge for the estimate.
We work in tight spaces every day in North Hollywood, and our technicians carry compact tools and flexible camera equipment specifically for crawlspaces eighteen inches or less. For Vineland area townhomes, we typically seal from both the register end and the plenum end, using extended applicators for mastic sealant and reinforced mesh tape that doesn’t require full hand access. Most Vineland townhome sealing jobs finish in a single afternoon. Call (844) 685-6342 to schedule a look.
Yes, register sealing is standard in our duct sealing service. In North Hollywood, we frequently find that the boot-to-drywall connection has never been sealed, allowing attic dust and insulation fibers to enter around the register rim. We seal the boot, the register connection, and the surrounding drywall penetration with appropriate materials. If the register itself is damaged, we can replace it with a properly sized unit. Call (844) 685-6342 for an exact quote, estimates are free.
Broken or disconnected ductwork can absolutely cause mold odors in North Hollywood bedrooms. When a return duct pulls air from a wall cavity or attic space instead of from the conditioned room, it draws in humid, unconditioned air that condenses on cooler surfaces. North Hollywood’s extreme heat cycling makes this worse, attics hit 140°F by day and cool rapidly after sunset. That moisture, combined with decades of accumulated dust, creates conditions for mold growth. We find the break with our camera, seal it properly, and can recommend sanitizing if needed. Call (844) 685-6342, we’ll trace it.
Most North Hollywood single-family home duct repairs take between three and six hours, and we complete them in one visit. A straightforward sealing job on a 1,200-square-foot ranch off Burbank Boulevard might take three hours. Replacing multiple earthquake-damaged flex runs in a larger home with difficult attic access could stretch to a full day. We tell you the expected duration before we start, and we don’t leave until the camera confirms the repair. Call (844) 685-6342 to book a slot.
Ready to stop losing conditioned air into your walls? Bellows Air Duct & Vent Co. has fixed North Hollywood ductwork since 1984. We’ll show you the problem, quote you one honest price, and stand behind the repair for 90 days in writing. No bait coupons, no voicemail, no arguing if something needs adjustment. Call (844) 685-6342 now for your free estimate. We’re here when you call.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving North Hollywood since 1984.