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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Manhattan Beach
Duct sealing in Manhattan Beach typically runs $800 – $2,400 for a whole-home system, with most single-family jobs landing between $1,200 and $1,800. We dispatch crews to Manhattan Beach from our Los Angeles scheduling office and can usually book an inspection within a few business days. Call (361) 326-5060 for a free written estimate.
We’ve worked in Manhattan Beach long enough to know the local pattern: salt air, older housing stock, and remodels done under coastal building codes that make ductwork a permit-sensitive repair. In the Sand Section and Tree Section especially, we find original galvanized steel ducts corroded at the seams, sealing tape peeling within a season, and crushed or disconnected runs that leak conditioned air into crawl spaces instead of reaching the registers. That’s not a generic airflow problem. It’s a Manhattan Beach problem, and it takes a crew that knows what to look for.
Why Hollis Air Duct Cleaning Is Manhattan Beach’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. Our Manhattan Beach customers know our technicians arrive uniformed, background-checked, and inside the quoted window. The Garrison Standard requires written pricing before any tool touches your system, and our 365-Day Done Right Promise covers every repair in writing. If the work fails within a year, we return and make it right at no charge, including a free second visit.
We answer our phones live, 24 hours a day, seven days a week. No voicemail loops, no callback queues. When you schedule duct sealing in Manhattan Beach, you speak to a person who can book the appointment and confirm the price structure. Our crews carry professional-grade equipment from Rotobrush, Nikro, and Guardsman, the same tools commercial contractors use, and we explain what we’re doing in plain terms while we work.
Roy Castellanos leads our operation, and The Garrison Code governs how every technician behaves on a job: arrive inside the window, price in writing, complete the work by the book, leave the site clean. That’s the standard we hold ourselves to in Manhattan Beach and every community we serve.
Duct Sealing Services in Manhattan Beach
Duct Sealing Services in Manhattan Beach address a specific set of failures caused by salt-laden marine air, high coastal humidity, and decades-old duct materials in beach bungalows and 1950s-60s ranch homes. The job involves locating leaks at corroded seams and disconnected joints, sealing them with mastic and mechanical fasteners rated for coastal conditions, and verifying airflow balance at each register. A typical whole-home duct sealing in Manhattan Beach runs $800 – $2,400 depending on system size, accessibility, and how many original runs need reconnection. Most Manhattan Beach homeowners need this service every 10 – 15 years, sooner if they notice hot or cold spots, rising energy bills, or musty airflow from registers.
Leak Detection and Mastic Sealing
We pressurize the duct system and use smoke pencils or theatrical fog to pinpoint leaks at seams, joints, and register boots. In Manhattan Beach’s older homes, we often find the original sealing tape has dried and peeled, or salt corrosion has opened gaps in galvanized steel connections. We remove failed materials and apply duct mastic, a thick, brush-on sealant that flexes with temperature changes and outlasts tape in humid coastal conditions.
Disconnected Run Reconnection
During camera inspection, we frequently find branch runs that were crushed or sealed off during past remodels, particularly in the Sand Section and Tree Section where additions and raised foundations are common. Reconnecting these runs restores airflow to back bedrooms and additions that have been uncomfortable for years. We seal all new connections and balance the system before we leave.
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.
Duct Insulation in Manhattan Beach
Duct Insulation in Manhattan Beach prevents the temperature loss and condensation problems that plague homes near the Pacific. Uninsulated or degraded ductwork in attics and crawl spaces loses heated or cooled air to the outside, forcing your HVAC system to run longer. In Manhattan Beach’s mild but humid coastal climate, cold supply ducts in warm crawl spaces sweat, creating moisture that feeds mildew growth. A typical duct insulation job in Manhattan Beach costs $1,000 – $2,800 for a whole home, depending on linear footage and whether we need to remove old, water-damaged insulation first.
R-Value Assessment and Replacement
We inspect existing insulation for compression, moisture damage, and adequate R-value for coastal conditions. Many Manhattan Beach homes still carry original insulation below current code minimums. We replace degraded material with Guardsman insulation products rated for high-humidity environments, sealed at seams to prevent vapor infiltration.
Vapor Barrier Installation
In crawl spaces and attics where the marine layer keeps ambient humidity elevated, we install or repair vapor barriers around insulated ducts. This stops condensation from forming on cold supply lines during summer months, which protects both the ductwork and your indoor air quality.
Trusted Brands We Service in Manhattan Beach
Our Manhattan Beach crews carry professional-grade equipment from Rotobrush, Nikro, and Guardsman. Rotobrush rotary brush systems and Nikro negative-air machines handle the mechanical cleaning and source removal that must precede any sealing work. For insulation and sealing materials, we stock Guardsman products rated for coastal humidity and salt exposure. We keep common fittings and materials on our vans to minimize return trips and complete most Manhattan Beach jobs in a single visit. When we need to order specialty components for custom homes in the Hill Section or El Porto, our Los Angeles office coordinates fast turnaround.
Common Duct Sealing Problems We See in Manhattan Beach Homes
- Salt corrosion of galvanized steel seams. Manhattan Beach’s onshore breezes carry corrosive salt inland, attacking original galvanized ductwork in beach bungalows and 1950s ranch homes. Sealing tape and mastic applied over corroded metal peel away within one or two seasons, reopening leaks.
- Disconnected runs from permit-sensitive remodels. Because Manhattan Beach’s coastal building codes require permits for ductwork modifications, previous owners sometimes sealed over or crushed branch runs rather than pull permits. We find these with camera inspection, particularly in the Sand Section and Tree Section.
- Mildew growth from marine layer humidity. The spring marine layer and year-round high humidity promote mildew inside ducts. Sealing a damp duct system traps moisture and odor instead of solving airflow loss, so we always verify dryness before sealing.
- Crushed flex duct in raised crawl spaces. Manhattan Beach’s mix of older homes on raised foundations and newer custom builds often puts flex duct in tight crawl spaces where it gets compressed by storage, pests, or settling. Crushed duct can’t be sealed; it needs replacement or rerouting.
Pricing for Duct Sealing in Manhattan Beach, CA
Whole-home duct sealing in Manhattan Beach typically costs $800 – $2,400. Most single-family homes in the Sand Section, Tree Section, and Hill Section fall in the $1,200 – $1,800 range. Smaller beach bungalows with simple trunk-and-branch systems may run lower; large custom homes with zoned systems or extensive disconnected runs can exceed the top of the range.
What moves the price: system size and complexity, accessibility of ducts in attic or crawl space, number of disconnected runs requiring reconnection, and whether insulation replacement is needed alongside sealing. We do not quote per-vent pricing or bait-and-switch teaser rates. You get one flat price per system, agreed in writing before work starts, based on what we find during inspection.
Every estimate is free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Manhattan Beach
Our crews work throughout the South Bay. We regularly schedule Duct Sealing in Manhattan Beach alongside jobs in Hermosa Beach, El Segundo, Lawndale, and Hawthorne. If you’re in one of these neighboring communities, the same pricing structure and 365-Day Done Right Promise apply.
Serving Manhattan Beach, CA - Our Local Coverage Area
We’re based in the Manhattan 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 Manhattan Beach
Salt-laden marine air accelerates corrosion of galvanized steel duct seams and joints, while high humidity degrades sealing materials faster than in drier inland climates. Manhattan Beach’s older housing stock, much of it original beach bungalows and 1950s-60s ranch homes, also means more decades of accumulated wear on ductwork. Call (361) 326-5060 for a free inspection and written estimate.
We run a camera inspection through the duct system after source removal cleaning, which reveals crushed runs, disconnections, and sealed-over branches that aren’t visible from the registers. In the Sand Section and Tree Section, we find these problems in roughly half the homes built before 1970. Call (361) 326-5060 to schedule a camera inspection.
Yes. Manhattan Beach’s coastal zone building codes require permits for ductwork modifications, including new runs and significant rerouting. We seal existing systems without permit requirements, but if our inspection reveals disconnected runs that need reconnection as part of a larger remodel, we’ll flag the permit issue and coordinate with your contractor. Call (361) 326-5060 to discuss your specific project.
Sealing alone won’t fix mildew; it can make it worse by trapping moisture in an already damp system. We clean and verify duct dryness with moisture meters before sealing, and we may recommend insulation upgrades or dehumidification if the marine layer is feeding recurring mildew. Call (361) 326-5060 for an inspection that addresses both airflow and moisture.
Return duct seams and joints fail first, particularly in homes near the beach where sand and salt deposits accumulate in the first several feet of ductwork behind return registers. Original galvanized steel corrodes at these seams, and the sealing tape or mastic applied during original construction peels away. Call (361) 326-5060 for a free estimate on sealing and corrosion repair.
In the Sand Section, our tech pulled a return register in a 1950s ranch home and found sand and salt crust packed into the first six feet of original galvanized steel duct, with a crushed run to a rear bedroom that had been sealed over during an earlier remodel. We set up negative pressure with a Rotobrush and HEPA filtration for source removal, then ran a camera inspection to map two disconnected branch runs before sealing the joints and reinsulating the span with Guardsman materials. The homeowner reported balanced airflow to the back bedroom for the first time in years.
Manhattan Beach’s Sand Section and Tree Section return ducts routinely collect sand and salt deposits carried in by onshore breezes and the marine layer, and this salt-laden dust accelerates corrosion of original galvanized steel duct seams in the area’s beach bungalows and 1950s-60s ranch homes. Because the city’s coastal building codes make ductwork changes permit-sensitive during remodels, we frequently find sealed-over or disconnected original runs that only a camera inspection reveals. That’s why our Duct Sealing process always starts with inspection, not guesswork.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Manhattan Beach and the South Bay since 2004.