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 Moorpark
We’re the Duct Sealing crew Hollis Air Duct Cleaning sends to Moorpark when flexible duct runs in attic trusses pull loose from plenums or boot collars tear under years of Santa Ana wind cycling. Dispatch and scheduling run from our Los Angeles office, but our trucks roll to Moorpark with mastic, foil tape, and negative-air HEPA rigs sized for the tract-home attics that dominate this market. If your back bedrooms won’t hold temperature or your filter loads up every three weeks, the problem is often not the filter. It’s air leaking into the attic or wall chase before it ever reaches the register. Call us at (361) 326-5060. We’ll put a written price in front of you before any work starts, and every seal we perform is covered by our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Moorpark’s Preferred Duct Sealing Company
We’ve been working in Moorpark long enough to know the difference between a 1989 flex run off Los Angeles Avenue and a 2004 build near Campus Canyon. That matters because the failure mode changes. Older flex gets brittle. Newer flex crushes where installers left too much slack in the attic chase. Our technicians are background-checked and uniformed, and they arrive inside the quoted window because The Garrison Standard doesn’t permit “on the way” texts that show up forty minutes late.
Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops. No callback queues on a Sunday evening when your system is whistling through a gap at the plenum. We price in writing before we touch the equipment, and that price does not move at the door. If a seal fails within a year, we come back and make it right at no charge. That includes a free second visit, not a negotiation.
Roy Castellanos leads Hollis Air Duct Cleaning, and the operational discipline he expects is what keeps our crews squared away on every Duct Sealing in Moorpark job.
Duct Repair in Moorpark
Duct Repair in Moorpark usually means fixing what the Santa Ana winds and attic heat cycling have done to flexible insulated runs installed from the late 1980s through the 2000s. We’re not talking about patching a single visible tear. We’re talking about re-securing crushed flex at the air handler plenum, replacing torn boot collars where supply lines meet east-facing registers, and restoring static pressure so your blower motor isn’t fighting itself. A typical duct repair in Moorpark runs $280 – $520 depending on how many runs need attention and whether we need to pull debris from the line before sealing.
Crushed Flex at Plenums and Collars
The most common call we get. Flex runs sag in attic trusses, then the Santa Ana winds cycle attic temperatures enough to harden the insulation jacket. The run pulls off the plenum or tears at the boot collar. We re-secure with proper supports, then seal with mastic and foil tape rated for temperature swing.
Disconnected Runs After Rodent or Wind Damage
Moorpark’s open space and agricultural edges mean occasional rodent pressure in attic duct systems. We inspect with a camera, reconnect the run, and seal the entry path so you’re not doing this again next season.
Air Duct Sealing in Moorpark
Air Duct Sealing in Moorpark addresses the leaks that let conditioned air escape into attics and wall chases before it ever reaches your living space. In a typical Moorpark tract home with flexible duct runs, we see 15 – 30 percent airflow loss at the plenum, boot collars, and poorly sealed register boxes. That’s air you paid to cool or heat, bleeding into the attic above your bedroom. A typical whole-system air duct sealing job in Moorpark runs $680 – $1,400 depending on system size, attic accessibility, and whether we need to perform source removal of accumulated ash and debris before the sealant goes on.
Mastic and Foil Tape Sealing
We brush mastic onto every joint, seam, and collar, then reinforce with foil tape. Mastic stays flexible. It doesn’t dry and crack like tape alone. In Moorpark’s attic temperature swings, that’s the difference between a seal that lasts and one that fails inside a year.
Negative-Air HEPA Preparation
Before we seal, we pull the system under negative pressure with Nikro HEPA filtration. This removes the fine Santa Ana ash and flex debris that would otherwise contaminate the new sealant. The result is a clean surface bond and cleaner air after we leave.
Trusted Brands We Service in Moorpark
Our trucks stock sealing mastic, foil tape, and replacement flex from Abatement Technologies and Guardsman, plus Rotobrush rotary systems for source removal when ducts need cleaning before sealing. We don’t run to a supply house mid-job. For Moorpark homeowners, that means the technician who diagnosed the problem is the one who fixes it, same visit, without a four-hour parts delay. We also carry Honeywell and Aprilaire filtration upgrades because a sealed duct system with a builder-grade MERV 6 filter is still letting fine particulate recirculate. When we seal your ducts, we’ll tell you honestly whether your filter is undermining the work.
Common Duct Sealing Problems We See in Moorpark Homes
- Flex runs collapsing in attic trusses. The late-80s through 2000s tract homes that define Moorpark used flexible insulated duct runs in attic chases rather than rigid metal trunks. Over twenty years of Santa Ana wind cycling, the insulation jacket hardens and the run sags or pulls off the plenum entirely. Sealing mastic alone won’t fix this. We re-support the run, then seal.
- East-facing return grilles loading with fine ash. Homes along the Arroyo Simi and near Moorpark College catch Santa Ana windborne ash and dust through northeast-facing returns. That fine particulate migrates past MERV 6-8 filters and finds unsealed plenum gaps, contaminating sealant from the inside. We clean before we seal, and we recommend filtration upgrades.
- Torn boot collars at register connections. The flex-to-register transition is a stress point. In Moorpark’s hot attics, the tape and support wire fatigue. Air leaks into the wall chase instead of the room. The bedroom never holds temperature. The homeowner buys a bigger AC. Wrong fix.
- Shared dryer vent stacks undermining sealed ducts. In denser Moorpark subdivisions with shared wall chases, a sealed duct system still struggles when the common lint pathway is restricted. The blower motor works against back pressure regardless of duct seal integrity. We check the full airflow path, not just the duct joints.
Pricing for Duct Sealing in Moorpark, CA
We don’t do per-vent teaser pricing. We don’t hand you a coupon that doubles once the van is in your driveway. A typical duct repair in Moorpark runs $280 – $520. A whole-system air duct sealing job runs $680 – $1,400. What moves the number is system size (a three-ton versus five-ton air handler), attic accessibility (truss spacing, hatch location), and whether we need to perform source removal of ash and flex debris before sealing. Every price is written down before work starts. It does not change at the door. Estimates are free. Call (361) 326-5060 and we’ll give you a firm range based on your system description.
We Also Serve Cities Near Moorpark
Our crews run regularly to Simi Valley, Fillmore, Thousand Oaks, and Oak Park. The same written pricing, same background-checked technicians, same 365-Day Done Right Promise applies in every direction from Moorpark.
Serving Moorpark, CA - Our Local Coverage Area
We’re based in the Moorpark 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 Moorpark
Flexible insulated duct runs, which dominate Moorpark’s late-80s through 2000s housing stock, sag, crush, and pull loose from plenums and boot collars over time. Metal ducts leak at seams but rarely collapse entirely. In Moorpark, we see flex runs that have detached completely, dumping conditioned air into the attic. Call (361) 326-5060 for a camera inspection if your back rooms won’t hold temperature.
The late fall Santa Ana episodes push fine ash and dust through east-facing returns, contaminating duct interiors. We prefer to seal after a negative-air HEPA cleaning so the mastic bonds to clean surfaces. If your system is heavily loaded, we’ll tell you before we quote. Call (361) 326-5060 and we’ll schedule around the season.
Yes, with building management coordination. Shared wall chases and stacked dryer runs mean we need access agreements and often need to clear the common lint pathway before sealing individual unit ducts. We’ve worked with Moorpark property managers on this. Call (361) 326-5060 and we’ll explain the coordination process.
We apply NADCA assessment and containment protocols to every duct sealing job that includes source removal. If we’re sealing only, without cleaning, we still inspect with a camera and protect registers with containment barriers. The standard is the standard. Call (361) 326-5060 for specifics on your system.
Sealing stops air loss into attics and chases. It does not stop fine particulate from recirculating through your living space. In Moorpark, where Santa Ana ash migrates past MERV 6 filters, we often recommend upgrading to a MERV 11 or better when we seal. We’ll show you the filter slot size and give you options. Call (361) 326-5060.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Moorpark and the surrounding Ventura County communities.