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 Livermore
Duct sealing in Livermore typically runs $800 – $2,400 for a whole-house system, and most jobs are completed in a single visit with the price written before we start. We’re the Livermore crew from Hollis Air Duct Cleaning, and we know the difference between a 1962 ranch off East Avenue with original galvanized steel trunks and a 2019 build on the west side with flex duct chewed open by rodents from the open space. Our dispatch team coordinates from the San Francisco Bay Area office, and our technicians are background-checked, uniformed, and carry the same Rotobrush and Nikro gear we use on commercial jobs. Call (361) 326-5060 for a free estimate – we’ll show up inside the window, price it in writing, and stand behind it for 365 days.
Why Hollis Air Duct Cleaning Is Livermore’s Preferred Duct Sealing Company
We’ve been working in Livermore long enough to know which neighborhoods still run the post-WWII ductwork installed when the Lawrence Livermore Lab brought the first boom of families to town. Our Duct Sealing team has sealed systems in the older downtown ranches, the Lab-area streets off East Avenue, and the newer developments pushing toward the Altamont Pass. Homeowners in Livermore call us back because we write the price down before we touch anything, and because our 365-Day Done Right Promise means if a seal fails or a seam reopens, 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 callback queues. No waiting until Monday to schedule.
HVAC Duct Sealing in Livermore
HVAC Duct Sealing in Livermore means closing the gaps, seams, and disconnected joints that let conditioned air escape into your attic, crawl space, or walls – and let wildfire ash, vineyard dust, and pollen from the Altamont Hills get pulled into the air you breathe. We use professional-grade mastic and reinforced tape, applied after camera inspection and source removal, to create a sealed system that holds pressure and keeps contaminants out. A typical whole-house seal in Livermore runs $800 – $1,800 for homes under 2,500 square feet, and $1,400 – $2,400 for larger systems or homes with multiple zones. Prices move based on accessibility (crawl space vs. attic), the condition of existing ductwork, and whether we need to remove debris before sealing.
Smoke and Ash Sealing
After a Diablo Range wildfire event, fine ash settles into the low spots of horizontal duct runs, especially in older homes with interior-insulated trunks. Sealing over that ash without removing it first traps the particulate inside, so it recirculates every time the heat kicks on. We camera-inspect first, remove the ash under negative pressure with HEPA filtration, then seal the seams clean.
Rodent Intrusion Sealing
Newer Livermore developments on the west side back up against open space, and flex duct in attics becomes a highway for rodents. We seal the entry points into the duct system, but we also flag active intrusion paths – sealing a chewed line without addressing the access point means the leak returns within a season.
Duct Repair in Livermore
Duct Repair in Livermore addresses the physical damage that sealing alone won’t fix: crushed flex lines, corroded galvanized steel, disconnected collars, and sections chewed through by rodents or degraded by decades of heat cycling. Repair costs typically run $400 – $1,200 for isolated section replacement, and $1,000 – $2,500 for more extensive rebuilds of original 1950s-60s systems. We use Aprilaire and Abatement Technologies filtration components when the system needs upgraded protection, and we always pressure-test after repair to confirm the fix holds before we leave.
Lab-Area Ranch Duct Replacement
The post-WWII ranches near Lawrence Livermore Lab often have galvanized steel trunks with interior insulation that has degraded past the point of sealing. We section in new duct where needed, preserve what we can, and upgrade connections with modern collars and mastic that won’t fail the next time the system pressurizes.
Condensation Damage Repair
Cool, damp Livermore winters cause condensation in unsealed supply and return ducts, especially in crawl spaces. Wet mastic lifts within months. We repair the water damage, seal with moisture-rated products, and address the ventilation issue so the repair lasts.
Trusted Brands We Service in Livermore
Our trucks stock parts and sealing materials from Rotobrush, Nikro, Aprilaire, and Abatement Technologies – the same professional-grade equipment commercial crews use, not hardware-store tape and caulk. For Livermore homeowners dealing with wildfire smoke and high particulate loads, we also carry Guardsman filtration upgrades that fit most residential systems. That means faster turnaround on repairs and seals: we don’t order parts and make you wait. We diagnose, pull from stock, and finish the job in one visit when possible. Every technician carries the full range, so the crew that arrives at your door has what your system needs.
Common Duct Sealing Problems We See in Livermore Homes
- Original 1950s-60s interior-insulated duct in downtown and Lab-area ranches traps wildfire ash in the low spots. Sealing over it without source removal just seals in the ash so it recirculates on every heat call. We camera-inspect first, remove the debris under negative pressure, then seal clean seams.
- Active rodent intrusion from open space on the west side chews through flex duct in attics. Sealing the register connection without closing the rodent doorway means the leak is back within a season. We flag the intrusion path and recommend exclusion work alongside the seal.
- Cool, damp Livermore winters cause condensation in unsealed supply and return ducts. Mastic or tape applied over a wet seam lifts within months instead of holding a MERV-rated seal. We dry the system, repair moisture damage, and use moisture-rated products.
- Extreme diurnal temperature swings stress old seam tape and mastic. Hot days expand the metal, cool nights contract it, and 1950s-era tape is the first thing to fail when we pressurize the system. We remove the old material entirely and apply fresh, flexible sealant rated for thermal cycling.
Pricing for Duct Sealing in Livermore, CA
A typical whole-house duct sealing in Livermore runs $800 – $2,400 depending on system size, accessibility, and whether we need source removal before we seal. Homes under 2,500 square feet with attic access usually fall in the $800 – $1,400 range. Larger homes, multi-zone systems, or properties with extensive 1950s ductwork needing repair before sealing can reach $1,800 – $2,400. We do not quote per-vent teaser prices that balloon once we’re inside. We inspect, write the full price down, and you approve it before we start. Every job includes before-and-after photos of your own ducts, pressure testing to confirm the seal holds, and our 365-Day Done Right Promise in writing. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near Livermore
Our crews work throughout the Tri-Valley and East Bay, including Pleasanton, Hayward, Dublin, and San Ramon. Each homeowner gets the same written price, the same background-checked uniformed technician, and the same 365-day guarantee – whether you’re in a downtown Livermore ranch or a new build near the Dublin border.
Serving Livermore, CA - Our Local Coverage Area
We’re based in the Livermore 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 Livermore
Every 2 to 3 years for sealing and cleaning, with a post-wildfire inspection after major Diablo Range smoke events. Unpaved roads kick up fine dust that loads filters faster, and open land means more pollen and rodent pressure than you’d see in a built-up neighborhood. Call (361) 326-5060 and we’ll schedule an inspection to set your specific interval.
Yes, but only if the sealing follows source removal. Sealing intact ducts prevents smoke-laden outside air from being pulled in through leaks in return lines and attic connections. In Livermore’s older homes, we often find that smoke entered through gaps around the air handler plenum and register boots, not just the filters. We seal those entry points after removing existing ash. Call (361) 326-5060 for a smoke-specific inspection.
We can seal it if the metal is structurally sound and the interior insulation hasn’t degraded into debris. Our crew sealed a 1958 ranch off East Avenue near the old Lab neighborhoods where the homeowner had been running the heat all summer because of smoke from the Diablo Range – camera inspection showed the original interior-insulated trunk had open seams and a half-inch ash layer sitting in the low run. We did source removal under negative pressure with HEPA filtration and agitation tools, then sealed the trunk seams and the air handler plenum and added fresh mastic at the collars. Her static pressure dropped and the ash stopped puffing out of the registers on every cycle. If the galvanized steel is corroded through or the insulation is falling apart, we section in new duct instead. Call (361) 326-5060 and we’ll camera-inspect to tell you which category you’re in.
Outbuildings often run on separate, smaller systems with flex duct that’s been exposed to temperature extremes and rodent activity without the monitoring a main house gets. The sealing interval stretches longer because the system runs less, but when it fails, it fails completely – no thermal mass from the house to buffer the swing. We treat these as standalone inspections with their own pressure tests and written prices. Call (361) 326-5060 to schedule.
We pressure-test the system before and after, measure static pressure at the air handler, and show you before-and-after photos from inside your own ducts. The numbers don’t lie: a properly sealed system holds pressure, delivers more air at the registers, and pulls less unfiltered air from the attic or crawl space. If the pressure doesn’t improve, we don’t call the job done. That’s covered under our 365-Day Done Right Promise – if a seal fails within a year, we return and make it right at no charge, including a free second visit. Call (361) 326-5060 to book your test.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Livermore and the Tri-Valley since 2004.