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 Mira Monte
Last October, after the first Santa Ana wind event of the season, we opened the plenum of a ranch-style home off Loma Drive and found fine gray ash packed two inches deep against the filter rack. The homeowner had run her system for three days before she noticed the haze inside. That’s Mira Monte in a nutshell: your ducts aren’t just moving conditioned air, they’re pulling in whatever the foothills throw at them, and in this unincorporated Ventura County community, that means oak pollen in spring, leaf litter year-round, and wildfire particulate every dry season.
We dispatch our Duct Sealing crews from our Fresno office, and Mira Monte sits within our regular Central Valley-to-Coast route. Most appointments book within a few days, not weeks. When you call (361) 326-5060, a live person answers, and we’ll give you a written price before any work starts. No estimates that balloon once we’re in your attic.
Why Hollis Air Duct Cleaning Is Mira Monte’s Preferred Duct Sealing Company
We’ve been sealing ducts in Mira Monte since long before the 2017 Thomas Fire made everyone here think harder about what their HVAC system was breathing. Roy Castellanos built Hollis Air Duct Cleaning in 2004 as part of the Garrison Partners family, and our crews know the local housing stock: the 1950s ranch homes with original flexible ductwork, the 1970s builds with evaporative cooler remnants still cluttering the plenum, the newer infill with attic handlers that bake in summer heat. We don’t guess at what we’ll find.
Our technicians are background-checked, uniformed, and expected to arrive inside the quoted window, price in writing, and leave the site clean. That’s The Garrison Code, and it’s how we work in Mira Monte, not just how we advertise. The 365-Day Done Right Promise covers every repair: if the seal fails within a year, we come back and make it right at no charge, including a free second visit. We’ve had Mira Monte homeowners call us back eleven months later when a summer heat wave revealed a weak spot we missed. We fixed it. No invoice, no argument.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule.
Duct Sealing Services in Mira Monte
Duct Sealing Services in Mira Monte address a problem most homeowners don’t know they have until their energy bill spikes or a back bedroom stays stubbornly hot. In this foothill community, the combination of original flexible ductwork, attic-mounted air handlers, and decades of Santa Ana wind pressure means leaks develop at joints, seams, and where old tape has dried to dust. We use mastic sealant and metal-backed tape, applied after pressure-testing to find every gap. A typical whole-system duct sealing job in Mira Monte runs $1,200 – $2,800 depending on accessibility and the condition of the existing ductwork.
Leak Detection and Pressure Testing
We pressurize your duct system and measure airflow loss with calibrated equipment. In Mira Monte’s older ranch homes, we regularly find 25 – 35% leakage at the plenum and main trunk connections, where original installers used cloth-backed tape that failed decades ago. The test takes about 45 minutes and gives us a map of every leak before we seal anything.
Mastic Sealant Application
Mastic is a fiber-reinforced paste we brush onto joints and seams. Unlike tape alone, it flexes with temperature swings and won’t dry out in Mira Monte’s hot attic summers. We apply it to every accessible joint, then verify with a second pressure test. The work typically takes a full day for a 1,500-square-foot home with attic ductwork.
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 Mira Monte
Duct Insulation in Mira Monte solves a different problem than sealing, though we often recommend both together. Your attic can reach 140°F in July, and uninsulated or poorly insulated ductwork loses 20 – 30% of its cooling capacity before the air ever reaches your vents. In Mira Monte’s single-story ranch homes, where ducts run through vented attics for 40 or 50 linear feet, that’s money you’re paying the utility to heat your attic. We wrap existing ductwork with formaldehyde-free fiberglass insulation, sealed with vapor barrier, or replace degraded flex duct with insulated hard pipe where appropriate. A typical duct insulation job in Mira Monte runs $800 – $1,800 for a standard ranch home.
Attic Duct Wrap and Vapor Barrier
We use insulation rated for California Title 24 compliance, with a reinforced vapor barrier that prevents condensation in winter. In Mira Monte’s dry climate, condensation is less of an issue than in coastal zones, but the vapor barrier still matters for keeping attic dust and pollen from adhering to damp duct surfaces.
Insulated Flex Duct Replacement
When existing flex duct has collapsed, torn, or lost its insulation integrity, we replace it with new R-6 or R-8 insulated flex duct. Many Mira Monte homes built in the 1960s and 1970s still have original R-4 or uninsulated hard pipe that doesn’t meet current standards. We size and install to match your system’s airflow requirements.
Trusted Brands We Service in Mira Monte
Our equipment comes from Nikro, Honeywell, and Abatement Technologies, the same brands commercial HVAC crews use in hospitals and schools. We stock local parts for Mira Monte customers, so we’re not ordering mastic or insulation wraps from a warehouse three counties away. Nikro negative-air machines let us contain debris during ductwork access. Honeywell filtration products integrate with your existing system if you’re upgrading. Abatement Technologies supplies our pressure-testing and leak-detection gear. We explain what each piece does and why we’re using it on your job, in plain terms, before we start.
Common Duct Sealing Problems We See in Mira Monte Homes
- Original cloth tape failure at plenum connections. Homes built between 1955 and 1985 in Mira Monte’s ranch tracts almost all used cloth-backed duct tape that deteriorates after 15 – 20 years. We find it hanging in strips, with visible gaps blowing conditioned air directly into the attic.
- Santa Ana wind pressure forcing leaks wider. The sustained 40 – 60 mph gusts common in fall and winter pressurize attic vents and exacerbate existing weak points in duct seams, especially on homes near the open oak woodland edges.
- Rodent and raccoon entry through unscreened attic vents. In the oak-shaded pockets of Mira Monte, we’ve found ducts torn open by animals accessing attics from the canopy. We seal the ducts and recommend vent screening, but we won’t pretend the duct repair alone solves the access problem.
- Evaporative cooler remnants creating dust-prone plenums. Many Mira Monte homes converted from swamp coolers to central air without fully cleaning or sealing the old plenum. The result is a reservoir of fine dust that recirculates until we remove it and seal the transitions properly.
Pricing for Duct Sealing in Mira Monte, CA
Whole-system duct sealing in Mira Monte typically runs $1,200 – $2,800. Duct insulation alone runs $800 – $1,800. If we’re doing both together, most homeowners fall in the $1,800 – $3,500 range. What moves you within those ranges: attic accessibility (crawl vs. walkable), the linear footage of ductwork, whether we need to remove degraded insulation first, and how many plenum or transition repairs are required. We don’t price per vent or per linear foot in a way that hides the total. We inspect, we test, we write one flat price per system, and that price does not move at the door. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Mira Monte
Our crews regularly travel from the Central Valley to the coast, and we maintain active service routes through Los Angeles, San Diego, San Jose, and San Francisco. If you know someone in those markets who needs the same standard we bring to Duct Sealing in Mira Monte, send them our way. The Garrison Standard travels.
Serving Mira Monte, CA - Our Local Coverage Area
We’re based in the Mira Monte 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 Mira Monte
Most Mira Monte appointments schedule within 2 – 4 business days, with dispatch coordinated from our Fresno office. Call (361) 326-5060 for next available openings; we’ll give you a firm arrival window, not a four-hour guess.
Yes, we service the full Mira Monte unincorporated area, from the Loma Drive corridor to the denser oak-canopy pockets where attic vent screening is often needed before ductwork can be properly sealed. We’ve worked on homes on well and septic throughout the community.
We don’t advertise emergency HVAC repair, but our phones are answered by a live person 24/7, and we can often expedite scheduling if your system is down or you’re preparing for wildfire season and need your ducts sealed against ash intrusion. Call (361) 326-5060 and we’ll tell you honestly what we can do.
Mira Monte pricing falls in the same Central Coast range as Ventura and slightly below Ojai’s hill-access premiums. The main cost driver here is attic accessibility in older ranch homes, not geography. We charge one flat price per system agreed before work starts, with no travel add-ons for Mira Monte.
Every duct sealing job is covered by our 365-Day Done Right Promise in writing. If the seal fails within a year, Hollis returns and makes it right at no charge, including a free second visit. The warranty is transferable if you sell your home during that period.
We also handle Air Duct Cleaning in Mira Monte and Dryer Vent Cleaning in Mira Monte, often bundled with sealing for homes preparing for fire season or addressing years of accumulated oak pollen and ash.
Ready to stop paying to cool your attic? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll pressure-test your system, show you exactly where you’re losing air, and give you a written price before any work starts. That’s The Garrison Standard, and it’s how we work in Mira Monte.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Mira Monte since 2004.