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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AfterFast, Reliable Duct Sealing Across Lomita
We’re the crew Hollis Air Duct Cleaning dispatches to Lomita from our Los Angeles office, and we know the difference between a tract home off Lomita Boulevard and a bungalow near Narbonne Avenue. Most of the calls we get here are from homeowners who’ve already had someone out – a cheap coupon job that stirred up dust and left the joints leaking worse than before. That doesn’t happen on our watch. We seal ducts the way The Garrison Standard requires: inspect first, price in writing, then work. If you’re in Lomita and your HVAC is pushing conditioned air into your crawlspace instead of your bedroom, call (361) 326-5060. We’ll give you a free estimate and a written price that doesn’t move.
Why Hollis Air Duct Cleaning Is Lomita’s Preferred Duct Sealing Company
We’ve been serving Lomita since long enough to know which 1950s tracts have asbestos-wrapped boots and which 1970s builds near Pacific Coast Highway have flex duct crushed by settling. That matters because duct sealing done blind – without knowing the local housing stock – is duct sealing done wrong.
Our technicians are background-checked, uniformed, and trained on Lomita’s specific failure modes: the ocean-moisture mildew that grows in idle ductwork during mild winters, the carbon-fouled dust from Zamperini Field’s piston traffic that inland crews misdiagnose as ordinary dirt, and the shallow crawlspaces where disconnected joints hide under decades of settlement. Every job gets a written price before we touch anything, and our Duct Sealing work is covered by the 365-Day Done Right Promise – if a seal fails within a year, we come back and make it right at no charge, including a free second visit.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No waiting until Monday to schedule.
HVAC Duct Sealing in Lomita
HVAC Duct Sealing in Lomita is not the same job it is in Pasadena or the Valley. Here, the marine layer keeps ducts cool and damp for months, and the piston-engine traffic overhead deposits fine carbon particulate that changes how we prep every joint. We don’t slap mastic over dirty metal. We source-remove first, then seal.
The process starts with a camera inspection of your trunk lines and branch runs. In Lomita’s 1940s – 1960s tract homes, we regularly find rectangular galvanized steel trunks with disconnected boots, gaps at the plenum connection, and flex duct that’s pulled away from the collar. We measure static pressure before and after, so you have numbers that prove the fix worked.
A typical HVAC duct sealing job in Lomita runs $450 – $850 for a single-system home, depending on how many joints need attention and whether we need to access a shallow crawlspace or slab-based chase. Two-system homes or jobs requiring extensive mastic and mesh reinforcement can reach $1,100 – $1,400. The price is written down before we start. It does not change at the door.
When Sealing Becomes Necessary
Most Lomita homeowners call us after noticing uneven temperatures between rooms, a spike in their electric bill, or dust that returns within days of cleaning. Those are classic signs your ducts are leaking conditioned air into your attic or crawlspace. In coastal climates like Lomita’s, where systems run less frequently, those leaks also pull in humid outside air that breeds mildew on the duct interior.
What We Use and Why
We seal with water-based duct mastic and fiberglass mesh reinforcement, not tape. Tape fails. Mastic flexes with thermal expansion and creates a permanent bond. For flex duct reconnections, we use mechanical collars and sealant rated for the temperature swings your Lomita system sees, even if it only runs hard a few months a year.
Duct Repair in Lomita
Duct Repair in Lomita often means fixing what decades of coastal moisture, rodent intrusion, and foundation settling have damaged. We don’t just patch. We determine why the duct failed so the repair lasts.
The most common call we get is for crushed or disconnected flex duct in shallow crawlspaces, especially in the postwar tracts between Lomita Boulevard and Palos Verdes Drive North. These homes were built with low pier-and-beam foundations that settle unevenly. Flex duct gets pinched, torn, or pulled completely off the boot. A handyman might reconnect it. We’ll inspect the entire run, replace damaged sections with new insulated flex rated for your system, and seal every joint with mastic.
Duct repair in Lomita typically runs $280 – $550 for a single disconnected or crushed run, including access, replacement material, and sealing. More extensive repairs involving multiple runs, trunk line damage, or rodent-damaged ductboard can run $650 – $950. As always, the price is written before we begin.
Disconnected Joints and Boot Failures
Galvanized steel boots in pre-1975 Lomita homes often separate from the trunk line as house settling stresses the connection. We reconnect with sheet-metal screws and a full mastic seal, then reinforce with mesh. In homes with asbestos-wrapped boots, we follow Cal-OSHA protocol and coordinate with certified abatement when disturbance is unavoidable.
Rodent and Pest Damage
Lomita’s mild climate and compact lot spacing mean rodents stay active year-round. We find chewed flex duct and nesting material in crawlspaces regularly. We remove contaminated duct, seal entry points we can access, and install new material. We don’t fog or spray – that doesn’t fix the physical damage.
Trusted Brands We Service in Lomita
Our vans carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration products from Honeywell, Aprilaire, and Guardsman. For Lomita homeowners, that means we don’t wait on parts shipped from out of state. If your system needs a specific collar, damper, or filtration upgrade after sealing, we likely have it on the van or can source it within a day from our Los Angeles supply chain. Rotobrush rotary systems handle the agitation and source-removal that must precede any sealant application. Guardsman filtration products give you options for upgraded capture of the fine particulate that coastal homes see more of than inland properties. Everything we install is sized for your specific ductwork, not a one-size-fits-all retrofit.
Common Duct Sealing Problems We See in Lomita Homes
- Carbon-fouled dust from Zamperini Field piston traffic. Return ducts north and east of the airport collect black, oily residue from leaded-avgas combustion that inland crews mistake for ordinary household dirt. Sealing over this contamination traps it against the metal and the sealant bond fails within a season. We HEPA-vacuum and agitate every surface before mastic touches it.
- Ocean-moisture mildew in idle ductwork. Lomita’s mild coastal climate means HVAC systems sit dormant for months. Without constant airflow, moisture from the marine layer condenses in low spots and breeds mildew. Sealing damp joints locks in microbial growth. We dry, clean, then seal – in that order, every time.
- Flex duct pinched under settled pier-and-beam foundations. The 1970s-era homes near Lomita Boulevard and Pacific Coast Highway corridor are especially prone. Decades of settling compress flex duct against the ground, restricting airflow and often tearing the vapor barrier. Camera inspection finds it. Replacement and proper support fix it.
- Disconnected galvanized boots in pre-1975 tracts. Original rectangular steel trunk lines with simple snap-lock connections separate as houses shift. The gaps are often small – a quarter-inch – but multiplied across every joint, they leak 20 – 30% of your conditioned air into the crawlspace. We seal every accessible joint, not just the obvious ones.
Pricing for Duct Sealing in Lomita, CA
Here’s what duct sealing costs in Lomita’s market, based on the jobs we’ve completed here:
| Service | Typical Range |
|---|---|
| HVAC duct sealing, single system (standard tract home) | $450 – $850 |
| HVAC duct sealing, two systems or extensive joint work | $1,100 – $1,400 |
| Duct repair, single run (disconnected/crushed flex) | $280 – $550 |
| Duct repair, multiple runs or trunk damage | $650 – $950 |
| Camera inspection with written report | $125 – $175 (waived with booked work) |
What moves the price: accessibility (slab vs. crawlspace), number of joints requiring sealing, extent of contamination requiring source removal first, and whether damaged duct needs replacement versus sealing alone. We do not price per vent. One flat price per system, agreed in writing before work starts. No add-ons at the door. Call (361) 326-5060 for a free estimate – we’ll inspect, explain what we found, and give you a written number you can take to another company if you want. Most homeowners don’t.
We Also Serve Cities Near Lomita
Our crews cover the full South Bay from our Los Angeles dispatch. We regularly handle Duct Sealing in Lomita and neighboring Lakewood, Torrance, Carson, and Rancho Palos Verdes. Each area has its own housing stock and climate quirks – Torrance’s larger mid-century ranches, Carson’s denser multi-family conversions, Rancho Palos Verdes’s hillside homes with longer duct runs – but The Garrison Standard applies the same: written price, background-checked uniformed techs, 365-Day Done Right Promise.
Serving Lomita, CA - Our Local Coverage Area
We’re based in the Lomita 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 Lomita
Pre-1975 homes in Lomita were built with galvanized steel trunk lines and simple snap-lock or tape-sealed joints that have degraded over 50+ years of thermal cycling and foundation settling. The original seals were never designed to last this long, and the shallow crawlspaces common here make joints accessible to moisture and pests. Newer construction uses better materials and tighter building envelopes from day one. If your Lomita tract home still has original ductwork, the leaks are almost certainly costing you 20 – 30% in efficiency. Call (361) 326-5060 and we’ll camera-inspect to show you exactly where.
The black dust is carbon particulate from piston-engine exhaust at nearby Zamperini Field, combined with ordinary household dust that the carbon bonds to. Duct sealing alone does not fix it – the contamination must be source-removed first with HEPA-filtered negative pressure and agitation tools. Then, and only then, we seal the joints so the duct system stops pulling in unfiltered air from your crawlspace or attic. Sealing over the black dust traps it and the sealant won’t bond properly. We scope every Lomita job near the airport to determine if source removal is needed before sealing.
Yes, but only after we determine where the moisture is entering. Slab homes in Lomita often have duct chases that run through the slab or in shallow perimeter foundations where the marine layer keeps concrete damp year-round. Sealing damp ductwork locks in mildew. We use borescope cameras to inspect slab chases, identify moisture sources, and dry the system before any sealant application. The musty smell typically resolves within 24 – 48 hours of proper source removal and sealing. Call (361) 326-5060 for a free inspection.
Carefully, with the right tools and the patience to do it right. Lomita’s shallow crawlspaces – often 18 – 24 inches of clearance – require compact equipment and technicians trained to work in confined spaces. We use low-profile negative-air machines and flexible agitation tools that fit where standard gear won’t. Every joint we seal is visually confirmed, not guessed at. If a run is too damaged to seal properly in that tight space, we’ll tell you and quote replacement, not patch it and hope. The Garrison Standard doesn’t allow hope.
A real job removes contamination physically, verifies the duct is clean with a camera, then seals with permanent materials like mastic and mesh. A fogging “sanitiser” sprays chemical into your ducts, does nothing to remove physical debris or fix leaks, and leaves you with wet ducts that grow more mildew. We don’t fog. We don’t sanitise as a standalone service. In Lomita’s damp coastal climate, fogging is especially counterproductive – you’re adding moisture to a system that already has too much. Our process is inspect, source-remove, verify, seal, verify again. Anything less is not The Garrison Standard.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Lomita and the South Bay since 2004.