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 San Clemente
We seal ducts in San Clemente homes where the marine layer never really lets up. If you’re in Pier Bowl, T-Street, or up in Talega, our crew drives to you from the Los Angeles dispatch office with the right materials for salt-air corrosion, not generic hardware-store tape. Most San Clemente jobs are scheduled within a few days, and we’ll give you a written price before we touch anything. Call (361) 326-5060 for a free estimate.
San Clemente’s oceanfront position creates a problem most inland Orange County homeowners don’t face: salt-laden moisture works its way into your ductwork through every gap and joint, corroding sheet metal from the inside and pulling that musty, marine-layer air straight into your living space. We’ve been sealing ducts in coastal California since 2004, and we’ve learned that standard foil tape fails here within months. Our Duct Sealing team uses butyl-mastic systems and corrosion-resistant coatings built for exactly this environment.
Why Hollis Air Duct Cleaning Is San Clemente’s Preferred Duct Sealing Company
We’re part of the Garrison Partners family, and every Hollis location operates under The Garrison Standard: arrive inside the quoted window, price in writing before work starts, complete the job by the book, and leave the site clean. In San Clemente, that standard matters more because the work is often hidden in attics and wall cavities where you can’t easily check it yourself.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. The price we write down is the price you pay; it does not move at the door. Every repair is covered by our 365-Day Done Right Promise: if the work fails within a year, we return 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.
We know San Clemente’s housing stock. Mid-century beach bungalows with original ductwork. Seventies and eighties tract homes in Talega with long attic runs off oversized air handlers. Custom homes near the coast where three separate systems cool different zones. Each configuration needs a different sealing approach, and we price by the system so you’re not paying per-vent for work that should cover the whole run.
Duct Insulation in San Clemente
Duct Insulation in San Clemente is often the missing piece after sealing. The same salt air that corrodes your metal ducts also destroys the thermal barrier that keeps conditioned air cold or hot as it travels through your attic or crawl space. Without proper insulation, you’re paying to cool air that warms up before it reaches your bedroom, or heat air that cools off in the marine-layer dampness of a San Clemente winter morning.
We wrap sealed trunks and long runs with professional-grade insulation rated for coastal humidity. This isn’t the big-box fiberglass wrap that sags and molds. We use materials from Abatement Technologies and Guardsman that hold their R-value and resist the moisture that standard products absorb.
When Insulation Beats Replacement
In many San Clemente homes, especially the 1970s builds with intact sheet metal, the ducts are structurally sound but thermally naked. Adding Duct Insulation after sealing restores efficiency without the cost of full replacement. We see this call most often from Talega homeowners who’ve already sealed leaks but still see high summer bills.
Salt-Air Damage to Old Insulation
Original duct insulation in coastal San Clemente homes is often crumbly, salt-crusted, or mold-stained. We remove it, treat the metal beneath, seal the joints, then re-insulate. Skipping the removal step traps moisture against the metal and accelerates the rust we were called to stop.
HVAC Duct Sealing in San Clemente
HVAC Duct Sealing in San Clemente requires materials that survive salt air. Standard foil tape, the kind you’ll find at any hardware store, lifts and fails within a season here. We use butyl-mastic compounds and mechanical fasteners on coastal jobs, with corrosion-inhibiting coatings on any exposed sheet metal. The goal is simple: close every gap where conditioned air escapes and unconditioned, salt-laden air enters.
Our process starts with a camera inspection of the full run. We document what we find, seal what can be sealed, and flag what needs replacement. You get before-and-after photos of your own ducts, not stock images from someone else’s job.
Per-System Pricing for Multi-System Homes
Many San Clemente homes, especially the larger custom builds near the coast and the multi-level designs in inland neighborhoods, run three separate HVAC systems. We price by the system, not by the vent. One flat price per system, agreed in writing before work starts. Treating only one of three systems leaves the others leaking marine-layer moisture into your attic and your air.
Camera Documentation You Can Keep
After we seal, we run the camera again. You get timestamped photos or video of the sealed joints, the coated metal, and the insulation wrap. For work you can’t see inside your walls, this documentation is your proof the job was done. We store copies too, tied to your job record, in case you need warranty service under the 365-Day Done Right Promise.
Trusted Brands We Service in San Clemente
Our equipment roster includes Nikro negative-air machines for containment during sealing work, Honeywell and Aprilaire filtration components we install when your system needs upgraded protection against coastal particulates, and Abatement Technologies HEPA gear for the agitation and cleanup phase. We stock parts and materials locally for San Clemente customers, so we’re not waiting on shipments to finish your job. When we quote a timeline, we mean it. The Garrison Standard requires arriving inside the window and completing by the book, and that only works when the right materials are already on the van.
Common Duct Sealing Problems We See in San Clemente Homes
- Rusted-through return trunks in beach-adjacent neighborhoods. In Pier Bowl and T-Street, salt air intrusion eats sheet metal from the inside out. Sealing over rust without treating or replacing the corroded section first guarantees failure within a season. We cut out the damage, coat the replacement, then seal.
- Foil tape lifting off joints within months. Standard adhesive breaks down fast in San Clemente’s humidity. We see this most often on DIY or cut-rate jobs where someone used hardware-store tape instead of butyl mastic. The fix is removal and re-sealing with coastal-grade materials.
- Partial system treatment in multi-system homes. A San Clemente homeowner seals one of three air handlers, then wonders why musty air still enters the master bedroom. The other two systems and their long attic runs keep pulling in marine-layer moisture. We quote and seal every system you want protected.
- Insulation gaps exposing sealed metal to new corrosion. Even properly sealed ducts fail if the insulation wrap is missing or degraded. Salt air hits bare metal, rust starts, and the seal breaks. We inspect insulation as part of every sealing job and replace what’s damaged.
Pricing for Duct Sealing in San Clemente, CA
A typical HVAC Duct Sealing job in San Clemente runs $450 – $950 for a single-system home with accessible attic runs. Two-system homes usually fall between $850 – $1,600. Three-system coastal properties with long trunk lines and corrosion treatment can range $1,400 – $2,400. Duct Insulation added after sealing runs $300 – $700 per system depending on linear footage and access difficulty.
What moves the price: how many systems you have, how much of the ductwork is accessible versus buried in walls, whether we need to treat or replace rusted sections before sealing, and if insulation replacement is part of the scope. We do not quote per-vent. One flat price per system, written down before we start, and it does not change at the door.
Estimates are free. Call (361) 326-5060 and we’ll schedule a technician to inspect your ducts, run the camera, and give you a written price you can compare.
We Also Serve Cities Near San Clemente
Our crews work throughout southern Orange County. We regularly seal ducts in San Clemente and nearby Dana Point, San Juan Capistrano, Ladera Ranch, and Laguna Niguel. Each community has its own housing stock and climate factors, but the coastal corrosion problem is strongest closest to the water. If you’re in any of these cities and smell musty air when your HVAC runs, the same salt-air intrusion is likely happening in your ducts.
Serving San Clemente, CA - Our Local Coverage Area
We’re based in the San Clemente 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 San Clemente
San Clemente’s persistent marine layer carries salt-laden moisture that corrodes ductwork from the inside and accelerates mold growth. Inland cities like Ladera Ranch or Laguna Niguel don’t face the same constant salt-air attack, so standard sealing materials last longer there. Here, using coastal-grade butyl mastic and corrosion coatings isn’t optional if you want the seal to survive past a single season. Call (361) 326-5060 for an exact quote on your home.
We seal however many systems you want protected, and we price by the system, not by the vent. One flat price per system, agreed in writing before work starts. Treating only one of three systems leaves the others leaking and pulling marine-layer moisture into your attic and your air. Most three-system homes in San Clemente run $1,400 – $2,400 for full sealing with corrosion treatment. Call (361) 326-5060 for a free estimate.
You should receive timestamped before-and-after camera images or video of your own ductwork, a written scope of work listing what was sealed and what materials were used, and a copy of your warranty terms under the 365-Day Done Right Promise. We provide all three on every San Clemente job. This documentation is your proof the work happened, and it’s required if you ever need warranty service. Call (361) 326-5060 and ask us to walk you through what you’ll receive.
Sealing fixes gaps and leaks; cleaning removes built-up debris and microbial growth. If you feel weak airflow at registers, smell musty air from specific rooms, or your energy bills spike without temperature changes, you likely have leaks that sealing will fix. If you see dust puffing from vents or have allergy symptoms that worsen when the HVAC runs, source removal cleaning comes first, then sealing to prevent recontamination. We inspect with a camera and recommend the right sequence for your San Clemente home. Call (361) 326-5060 to schedule.
Yes, but only as part of a complete approach. Sealing stops the infiltration of humid, salt-laden marine-layer air that feeds mold growth inside your ducts. In Pier Bowl and T-Street homes, we often find that sealing alone isn’t enough if the ducts are already contaminated. We typically recommend source removal cleaning with HEPA filtration and agitation tools first, then sealing with corrosion-resistant materials, then insulation replacement to prevent future condensation. The musty smell usually disappears once the moisture source is cut off. Call (361) 326-5060 for an inspection and written plan.
Near T-Street in San Clemente, we sealed a 1970s home with three separate systems and long attic runs off the air handler; a camera inspection found rusted-through sections in a return trunk and salt-crusted joints that were feeding musty air into the bedrooms. After source removal, HEPA filtration, and agitation tools cleared the run, we wrapped the trunk with Duct Insulation and sealed the seams, restoring negative pressure so the marine layer wasn’t being pulled into the supply and return ducts at every register.
In beach-adjacent neighborhoods like Pier Bowl and T-Street, salt air intrusion rusts ductwork through from the inside, so we seal sheet-metal runs here with coatings and butyl-mastic systems meant for coastal corrosion rather than the standard foil tape used a few miles inland in Talega. This isn’t a minor material preference. We’ve pulled up foil tape in San Clemente coastal homes that failed in four months, the adhesive dissolved by salt humidity, the metal beneath already pocking with rust. The right sealant costs more upfront. It costs far less than doing the job twice.
Ready to stop losing conditioned air and pulling marine-layer moisture into your San Clemente home? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll inspect your ducts with a camera, give you a written price before any work starts, and back every seal with our 365-Day Done Right Promise. Roy Castellanos and our team are standing by.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving San Clemente since 2004.