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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After
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Before
AfterFast, Reliable Duct Sealing Across Hermosa Beach
Duct sealing in Hermosa Beach typically runs $450 – $1,200 for a whole-home system, depending on whether we’re sealing accessible joints in a crawl space or chasing leaks through original 1950s galvanized runs behind plaster. Most Hermosa Beach jobs take a half day, and we write the price down before any mastic goes on. Call (361) 326-5060 for a free estimate.
We know Hermosa Beach. Our crews cover the bungalows west of Pacific Coast Highway, the townhomes near the pier, and the hillside streets above Valley Drive. Dispatch is coordinated from our Los Angeles office, but the trucks that roll to Hermosa Beach carry the same Rotobrush and Nikro equipment we use on commercial jobs. We understand what salt air does to unlined metal ductwork here, and we know the difference between a real seal and a temporary patch that’ll fail before the next Santa Ana season.
Why Hollis Air Duct Cleaning Is Hermosa Beach’s Preferred Duct Sealing Company
Hermosa Beach homeowners call us because we’ve built a reputation on showing up inside the window, pricing in writing, and leaving the site clean. That’s The Garrison Standard, and it applies to every job we run in the South Bay.
Our technicians are background-checked and uniformed. You know who’s walking in before they arrive. The price we write down before work starts is the price you pay. No estimates that balloon once we’re inside your crawl space.
Every repair and sealing job carries our 365-Day Done Right Promise. If the work fails within a year, we come back and make it right at no charge, including a free second visit. That’s not a verbal assurance; it’s written on every invoice.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule.
Duct Repair in Hermosa Beach
Duct Repair in Hermosa Beach means fixing the physical damage that salt corrosion, sand abrasion, and decades of vibration have done to your duct runs. We see a lot of separated flex duct, corroded galvanized seams, and crushed returns in the crawl spaces beneath Hermosa Avenue and the bungalows near the Strand. A typical duct repair here runs $280 – $650 for localized fixes, or $800 – $1,500 if we’re replacing corroded sections of original metal duct.
Corroded Metal Seams
Original galvanized duct in Hermosa Beach beach bungalows corrodes from the inside out. Salt-laden humid air condenses on the metal, and the corrosion pits spread until the seam splits. We cut out the damaged section, fabricate a replacement from matching gauge metal, and seal it with mastic and mesh, not tape that’ll peel in the damp crawl space.
Sagging Flex Duct Returns
The flexible duct installed in many 1970s Hermosa Beach remodels has sagged over decades, creating low spots where condensation pools and mold grows. We support the run properly, replace water-damaged sections, and seal the connections so air moves through the duct, not into your insulation.
Air Duct Sealing in Hermosa Beach
Air Duct Sealing in Hermosa Beach is the process of closing leaks in your supply and return ductwork so conditioned air reaches the rooms it’s supposed to, not your crawl space or attic. In a typical Hermosa Beach bungalow, we measure 20 – 35% air loss through leaks before we start. After sealing with mastic and mesh, that drops to under 5%. Whole-home air duct sealing here runs $450 – $1,200, with most single-story bungalows falling in the $550 – $850 range.
Mastic and Mesh, Not Tape
We seal with water-based mastic reinforced with fiberglass mesh. It flexes with thermal expansion, bonds to metal and flex duct alike, and lasts decades. Duct tape fails in months, especially in humid coastal crawl spaces. We don’t use it.
Pressure Testing After Sealing
We run a duct blaster or manometer test before and after. You see the numbers. If the pressure differential doesn’t improve, we keep looking for leaks until it does. That’s The Garrison Code: verify the work, don’t assume it.
Trusted Brands We Service in Hermosa Beach
We stock parts and sealing materials from Aprilaire, Abatement Technologies, and Guardsman for Hermosa Beach customers. That means no waiting a week for a specialty collar or damper. Our trucks carry mastic, mesh, mechanical fasteners, and replacement duct sections sized for the smaller crawl spaces common in Hermosa Beach bungalows. When we need filtration upgrades after sealing, we source Honeywell and Aprilaire media that fits the tighter blower compartments in older systems. Fast turnaround matters here because a home with leaking supply ducts in July is pulling humid marine air through every gap, and the compressor never catches up.
Common Duct Sealing Problems We See in Hermosa Beach Homes
- Sealing over salt-corroded metal without cleaning first. Some crews smear mastic over white, powdery galvanized corrosion and call it sealed. The mastic traps moisture underneath, and the corrosion keeps eating the duct. We remove the scale, treat the metal, then seal.
- Fogging “sanitiser” instead of physical removal. A misted chemical doesn’t remove sand, salt crystals, or biofilm. It covers the smell for a few weeks. We use rotary brush agitation and negative-air HEPA extraction to pull debris out of the duct, then seal clean metal.
- Ignoring failed return ducts. In 1950s Hermosa Beach bungalows, the return side is often original flex that has sagged and separated. Sealing the supply runs beautifully just pushes more air out through the return leaks. We test and seal both sides.
- Missing Santa Ana sand infiltration. After a Santa Ana event, fine beach sand and salt crystals blow into duct runs west of Pacific Coast Highway. If we seal without removing this abrasive layer, it scratches and corrodes from inside while the homeowner pays for “improved efficiency.”
Pricing for Duct Sealing in Hermosa Beach, CA
A typical duct sealing job in Hermosa Beach runs $450 – $1,200 for a whole-home system. Single-story bungalows with accessible crawl spaces usually fall at $550 – $850. Two-story townhomes or jobs requiring access through finished spaces trend higher, $900 – $1,200. Duct repair, when needed before sealing, adds $280 – $650 for localized fixes.
What moves the number: accessibility (crawl space height, finished basement ceilings), extent of corrosion damage requiring section replacement, and whether we need to seal both supply and return or just one system. We write the price down before any work starts. One flat price per system. No per-vent pricing, no add-ons at the door.
Call (361) 326-5060 for a free estimate. We’ll inspect the duct runs, show you what we find, and give you a written price you can compare.
We Also Serve Cities Near Hermosa Beach
Our crews run regular routes through Manhattan Beach, Redondo Beach, Lawndale, and El Segundo. If you’re in the South Bay and your ducts are leaking conditioned air into a damp crawl space, we cover your area. Learn more about Duct Sealing in Hermosa Beach and surrounding communities, or explore our full Duct Sealing service details.
Serving Hermosa Beach, CA - Our Local Coverage Area
We’re based in the Hermosa Beach 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 Duct Sealing in Hermosa Beach
Hermosa Beach sits in a marine layer that keeps relative humidity high year-round, so unlined 1950s – 60s galvanized ducts west of Pacific Coast Highway corrode and grow surface mold faster than ducts just a few miles inland in Torrance or Gardena. The salt-laden onshore breeze penetrates crawl space vents and condenses on cool metal duct walls. After a Santa Ana event, fine sand and salt crystals blow into those same runs, scratching the metal and feeding the corrosion. Call (361) 326-5060 if you smell musty air when the blower starts; that’s often the first sign.
Yes, because the sand and salt that enter Hermosa Beach duct runs are fine enough to pass through standard return grilles without visible accumulation inside your living space. We camera-inspect ducts after Santa Ana events and regularly find a layer of abrasive grit along the bottom of galvanized runs, especially in homes west of Pacific Coast Highway. That grit scratches metal, traps moisture, and accelerates corrosion whether or not your vents look dusty. Call (361) 326-5060 for an inspection; estimates are free.
No, fogging masks odor temporarily but does not remove the source. In Hermosa Beach’s humid coastal climate, musty smells come from biofilm growing on salt-corroded metal and sand debris inside the duct. A chemical mist coats the surface but leaves the growth underneath alive. We remove the debris with rotary brush agitation and negative-air HEPA extraction, then seal clean metal so moisture can’t re-enter. The smell stays gone because the source is gone. Call (361) 326-5060 to schedule source removal, not a cover-up.
Most Hermosa Beach homes do well with MERV 8 – 11, which captures fine sand and salt particles without overloading older blower motors common in 1950s – 70s beach bungalows. MERV 13 and above restrict airflow significantly and can cause ice-up or motor strain on systems not designed for the pressure drop. After we seal your ducts, we test static pressure and recommend filtration that your blower can actually handle. Call (361) 326-5060 and we’ll measure it on site.
We can often seal original galvanized ducts if the corrosion is surface-level and the metal retains structural integrity. We clean the scale, treat the metal, and seal with mastic and mesh. If corrosion has pitted through the wall or the duct has collapsed sections, replacement is the honest recommendation. We show you the camera footage and write the price for either option before any work starts. Call (361) 326-5060 for an inspection and straight answer on your specific ductwork.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Hermosa Beach since 2004.