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 Laguna Hills
Duct sealing in Laguna Hills typically runs $1,200 – $2,800 per system depending on how much original flex duct needs replacement versus spot sealing, and most jobs are scheduled within a few days with a written price locked before work starts. We’re familiar with the tract homes throughout Moulton Ranch, the estate properties in Nellie Gail Ranch, and the condo clusters near the Laguna Hills Mall area. Because crews serve Laguna Hills locally and dispatch from our Los Angeles office, we carry extra R-8 flex duct and mastic on every van. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Laguna Hills’s Preferred Duct Sealing Company
We’ve worked in Laguna Hills long enough to know the difference between a 1978 Moulton Ranch split-level and a 1986 two-story with dual systems serving opposite wings. That matters because the duct problems are different, and so is the pricing. Our Duct Sealing team treats each system as its own job with its own written price.
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. The 365-Day Done Right Promise covers every duct sealing job in writing: if the seal fails or airflow drops within a year, we return and make it right at no charge, including a free second visit. Technicians are background-checked, uniformed, and expected to arrive inside the quoted window, price in writing before touching anything, and leave the site clean. That’s The Garrison Standard, and it’s how we work in Laguna Hills.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues.
Air Duct Sealing in Laguna Hills
Air Duct Sealing in Laguna Hills is rarely just about brushing mastic onto a joint. In this city, it’s usually about replacing original or first-replacement flex duct that has baked in 140 – 150°F attic heat for decades. Most Laguna Hills homes were built between the late 1960s and 1990s, and their R-4 or R-6 flex duct insulation turns brittle, cracks at collars, and leaks conditioned air into the attic before it ever reaches the registers. A typical Air Duct Sealing job here runs $1,200 – $2,800 per system. That range covers everything from spot-sealing a handful of leaky plenum joints to full flex replacement on long attic runs.
What We Actually Do Up There
We pressurize the system and use a smoke pencil or digital manometer to find leaks. Then we seal plenum joints with mastic and fiberglass mesh, replace failed flex with new R-8 insulated duct, and strap it so it doesn’t sag. Sagging flex creates turbulence and static pressure drop. In Laguna Hills attics, that matters more than in milder climates because the system is already fighting extreme heat gain.
When to Call
Call when rooms farthest from the air handler never cool properly, when your July electric bill spikes despite normal usage, or when you feel weak airflow at second-floor registers. These are classic signs of leaky attic ductwork in Laguna Hills’s older tract homes, not necessarily a failing condenser.
Duct Sealing Services in Laguna Hills
Duct Sealing Services in Laguna Hills cover the full range from diagnostic pressure testing to complete attic duct replacement. Because most local homes run flex duct through unconditioned attics, sealing alone often isn’t enough. The insulation has degraded. We price per system, not per vent, so a home with three separate HVAC units gets three separate written quotes. No bundled mystery pricing. Typical Duct Sealing Services in Laguna Hills fall between $1,200 and $2,800 per system depending on linear feet of duct, number of plenums, and whether the air handler cabinet itself needs resealing.
Per-System Pricing for Larger Homes
Nellie Gail Ranch and upper Moulton Ranch have homes with two, sometimes three separate systems. Each has its own air handler, plenum, and trunk lines. We quote each independently. A homeowner with three systems might pay $3,600 – $8,400 total, but they know exactly what each system costs before we start. No one gets surprised at the door.
Documentation You Can Keep
Every job gets before-and-after static pressure readings, airflow measurements at key registers, and photos of the sealed plenums and replaced flex. In Laguna Hills, where you can’t safely inspect your own attic for half the year, this paperwork is your proof the work happened and worked.
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 Laguna Hills
Hollis carries professional-grade equipment from Nikro, Honeywell, and Aprilaire on every Laguna Hills job. Nikro negative-air machines handle source removal when returns are contaminated with wildfire ash. Honeywell and Aprilaire filtration products replace undersized original filters that let fine particulate bypass and coat duct walls. We stock common flex diameters, collar sizes, and mastic supplies locally so we’re not waiting on parts while your attic sits open. Most Laguna Hills jobs are completed in one scheduled day.
Common Duct Sealing Problems We See in Laguna Hills Homes
- Brittle R-4/R-6 flex cracking at collars. Original flex duct insulation in Laguna Hills attics bakes to brittleness after 20+ summers above 140°F. The collar connection is the first failure point. We replace with R-8 flex and metal-reinforced collars.
- Leaky plenums at aging air handlers. The sheet-metal box connecting your air handler to the duct trunk was sealed with tape that dried out years ago. Conditioned air leaks directly into the attic, short-cycling the system. Homeowners think their AC can’t keep up. Often it’s the plenum, not the condenser.
- Long rooftop-level runs losing pressure before reaching distant rooms. Two-story homes in Moulton Ranch with master suites over the garage have 40-foot flex runs through 150°F attics. By the time air reaches the register, it’s gained 15 – 20 degrees. Sealing and insulating those runs is essential.
- Return leaks pulling in Santa Ana dust and wildfire ash. Unsealed return registers and panned joist returns draw in attic air and outdoor particulate during wind events. We seal returns at the source and upgrade filtration so the next fire season doesn’t recontaminate clean ducts.
Pricing for Duct Sealing in Laguna Hills, CA
A typical duct sealing job in Laguna Hills runs $1,200 – $2,800 per HVAC system. Spot-sealing a single leaky plenum and a few collar joints lands at the lower end. Full replacement of degraded flex trunk and branch lines on a large home with long attic runs pushes toward the higher end. Three-system homes in Nellie Gail Ranch or upper Moulton Ranch can range $3,600 – $8,400 total, quoted per system in writing before work starts.
What moves the price: linear feet of duct needing replacement, accessibility of the attic (some Laguna Hills two-stories have tight scuttle holes), whether the air handler cabinet itself needs resealing, and if returns need panned-joist sealing or register boot replacement. We do not quote per vent. One flat price per system, agreed before work starts, with no add-ons at the door.
Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Laguna Hills
Our crews work throughout South Orange County, including Laguna Hills and neighboring Aliso Viejo, Laguna Woods, Mission Viejo, and Lake Forest. Same per-system pricing, same written guarantee, same live-answer scheduling. If you’re in one of these cities and your AC can’t keep up this summer, the ducts are worth checking before you replace the condenser.
Serving Laguna Hills, CA - Our Local Coverage Area
We’re based in the Laguna Hills 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 Laguna Hills
Each system has its own set of leaks, so a home with three units can be losing conditioned air from three separate plenums and trunk lines. We test and quote each system independently. A homeowner in Nellie Gail Ranch with dual systems might have one unit in good shape and another with a completely failed flex trunk. Per-system pricing means you pay only for what each system actually needs. Call (361) 326-5060 for a free estimate on each unit.
We pressurize the system from the air handler and use a smoke pencil or digital manometer to locate leaks without crawling every joist bay. Then we photograph every sealed joint and replaced flex run, and we record before-and-after static pressure and airflow readings. In a two-story Moulton Ranch home with dual systems serving long runs to both wings, our techs found a 1980s flex trunk in the attic split open at a collar and a leaky plenum feeding a 20-year-old air handler; we sealed the plenum with mastic and mesh, replaced the failed R-4 flex with new R-8, and documented before/after static pressure and airflow readings so the homeowner could see the supply and return ducts were actually holding pressure in 145°F attic heat. You get the paperwork. You don’t need to climb up there yourself.
It’s often the ducts, not the condenser. In Laguna Hills, the first hot spell of summer triggers a wave of calls from homeowners who swear their AC can’t keep up. The real problem is usually leaky, undersized attic ducts losing 20 – 30% of conditioned air into a 145°F attic. We measure static pressure and airflow at the registers first. If the ducts are leaking, sealing them restores capacity without touching the condenser. If the ducts test tight, we’ll tell you honestly that the problem is elsewhere. Call (361) 326-5060 and we’ll diagnose before quoting any work.
Yes, but only if you also seal the return side. Santa Ana winds and wildfire smoke push fine ash through unsealed return registers and panned joist returns. If we seal supply ducts but leave returns leaking, the next wind event recontaminates everything. Our Duct Sealing Services include return-side sealing and upgraded filtration using Honeywell and Aprilaire products rated for fine particulate. This is particularly relevant in Laguna Hills, where Santa Ana events are annual and wildfire smoke has become frequent.
You should receive before-and-after static pressure readings in inches of water column, airflow measurements in CFM at representative supply and return registers, dated photos of sealed plenums and replaced flex, and a written invoice showing exactly what was done per system. Hollis provides all of this on every job. The 365-Day Done Right Promise is also included in writing: if airflow drops or seals fail within a year, we return at no charge, including a free second visit. In Laguna Hills, where attic work is invisible and attics are dangerously hot, this paperwork is your only practical proof of work performed and work that held up.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Laguna Hills and South Orange County since 2004.