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 Bernardino
We dispatch our Duct Sealing crews from our Inland Empire office, and we’re typically on-site in San Bernardino the same week you call. If you live near the 210, the 215, or down in the Del Rosa neighborhood, you know how the Santa Ana winds can push dust through every crack in an older home. We’ve been sealing ducts in San Bernardino long enough to know which houses have original 1950s galvanized runs and which developments have the newer flex systems. That difference matters for how we price the job and how we do it. Call (361) 326-5060 and we’ll give you a written estimate before any work starts.
Why Hollis Air Duct Cleaning Is San Bernardino’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. Our San Bernardino crews work under The Garrison Standard: arrive inside the quoted window, price in writing before touching anything, finish by the book, and leave the site clean. Every technician is background-checked and uniformed, so you know who’s walking through your door.
Our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues. When you’re trying to figure out why your bedroom never gets cool or why your power bill jumped after the last Santa Ana event, you don’t want to wait until Monday.
We back every duct sealing job with our 365-Day Done Right Promise. If the seal fails, if a joint opens up, if the problem we fixed comes back within a year, we return and make it right at no charge. That includes a free second visit. We put that in writing on every job, not because it’s good marketing, but because it’s how we operate.
Duct Insulation in San Bernardino
Duct Insulation in San Bernardino addresses a specific problem: the temperature loss that happens when your conditioned air travels through uninsulated or poorly insulated duct runs, especially in attics and crawl spaces where summer temperatures can exceed 140 degrees. In San Bernardino’s climate, where air conditioning runs hard from May through October, every degree of lost cooling costs you money at the meter. A typical duct insulation job in San Bernardino runs $800 – $1,800 for a standard single-system home, depending on how many linear feet of duct need wrapping and whether we’re working in an accessible attic or a tight crawl space.
When Attic Ducts Need Wrapping
Homes in the University District and western San Bernardino often have duct runs strung through unconditioned attics. The original insulation, if there was any, has compressed or degraded over decades. We wrap supply and return lines with formaldehyde-free fiberglass insulation rated for California Title 24 compliance, then seal the seams with mastic so the insulation doesn’t become a dust collector.
Crawl Space Applications
Post-war bungalows near downtown San Bernardino sometimes have under-floor ductwork in vented crawl spaces. Ground moisture and seasonal temperature swings accelerate corrosion on galvanized steel. We inspect for integrity first. If the metal is sound, we insulate and seal. If it’s failing, we’ll tell you straight and discuss replacement options with written pricing.
HVAC Duct Sealing in San Bernardino
HVAC Duct Sealing in San Bernardino is the process of closing leaks, gaps, and disconnected joints in your forced-air system so the air you’ve paid to heat or cool actually reaches the rooms it’s supposed to serve. In San Bernardino, where extended AC seasons keep ducts under constant pressure, even small leaks add up to significant energy waste and uneven temperatures. A typical HVAC duct sealing job in San Bernardino runs $600 – $1,400 for a single-system home, with whole-house Aeroseal applications ranging $1,500 – $2,800 depending on system size and leak severity.
Manual Sealing with Mastic
For accessible ductwork in attics and mechanical rooms, we apply UL-181 rated mastic sealant to every joint, seam, and penetration. Mastic remains flexible, so it won’t crack as ducts expand and contract through San Bernardino’s hot summers and cooler winter nights. We follow this with a pressure test to verify results.
Aeroseal for Inaccessible Leaks
When ducts are buried in walls or sealed chases, we offer Aeroseal technology: a polymer sealant blown through the system that finds and plugs leaks from the inside. We measure leakage before and after with a computerized blower test. Most San Bernardino homes see 30 – 90% leakage reduction.
Trusted Brands We Service in San Bernardino
Our San Bernardino vans carry equipment and materials from Rotobrush, Aprilaire, and Abatement Technologies. We stock mastic sealants, fiberglass insulation wraps, and mechanical fasteners sized for both vintage galvanized systems and modern flex duct. For filtration upgrades after sealing, we source Honeywell and Guardsman products. Because we maintain inventory at our Inland Empire office, most San Bernardino jobs don’t wait on parts. If your system needs a specific collar, damper, or transition fitting to complete a proper seal, we typically have it on the van or can source it within 24 hours.
Common Duct Sealing Problems We See in San Bernardino Homes
- Black, sooty residue mistaken for mold. In Del Rosa and the University District, we regularly find 1950s galvanized ductwork coated in a thick, dark film from decades of smog and desert dust. Homeowners often assume it’s mold. Camera inspection and field testing usually show it’s particulate buildup, not microbial growth, but it must be physically removed before sealing or the sealant traps it in place.
- Loose joints on corroded galvanized seams. Original steel ductwork in central San Bernardino tract homes has had 70+ years of thermal cycling. The rough, corroded surfaces don’t take sealant well without proper preparation. We clean and mechanically secure joints before applying mastic, or the seal won’t hold through the next summer.
- Return-side leaks pulling in unfiltered air. Post-WWII bungalows often have unsealed return plenums and gaps around the air handler. When the Santa Ana winds kick up, these leaks draw dust, pollen, and debris straight into your system, bypassing the filter entirely. Sealing the return path is as important as sealing supplies.
- Flex duct disconnections in newer developments. Homes on San Bernardino’s outskirts built since the 1990s use flexible duct, which can sag, kink, or pull loose from collars. The desert UV and temperature extremes accelerate deterioration. We reconnect, support, and seal with proper straps and mastic, not duct tape.
Pricing for Duct Sealing in San Bernardino, CA
Duct sealing in San Bernardino typically costs $600 – $1,400 for manual mastic sealing of accessible ductwork in a single-system home. Whole-house Aeroseal applications run $1,500 – $2,800. Duct insulation adds $800 – $1,800 depending on linear footage and access difficulty. These are whole-system prices, not per-vent teaser rates that balloon once the technician is inside your home.
What moves the price: the age and condition of your ductwork, how much of it is accessible versus buried, whether we need to remove decades of buildup before sealing, and whether we’re insulating as well as sealing. Homes with original 1950s galvanized systems in Del Rosa or the University District often need source removal and mechanical joint repair before sealant goes on. That takes more time, but doing it right means the seal lasts.
We give you one flat price per system, agreed in writing, before any work starts. The number does not move at the door. We also provide before-and-after photos of your own ducts so you can see what was done. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near San Bernardino
Our crews work throughout the Inland Empire. We regularly handle Duct Sealing in San Bernardino and in neighboring Loma Linda, Highland, Rialto, and Colton. Dispatch and scheduling are coordinated from our local office, so response times stay short across the metro area.
Serving San Bernardino, CA - Our Local Coverage Area
We’re based in the San Bernardino 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 Bernardino
Usually not. In Del Rosa and similar older San Bernardino neighborhoods, the black coating inside 1950s galvanized ducts is typically decades of smog particulate and desert dust, not mold. We verify with camera inspection and field testing before we start. If you’re concerned, call (361) 326-5060 and we’ll check it during your free estimate.
San Bernardino’s combination of high desert dust, smog, and hard-working AC systems means leaks pull more contamination into your ducts and waste more energy per hour of runtime. Coastal cities have different problems; here, the Santa Ana winds actively pressurize your home’s envelope and force unfiltered air through every gap. Sealing is your first defense.
We can often seal it if the metal is structurally sound. The bigger issue is the debris layer on rough, corroded seams. We source-remove that buildup first, then seal with mastic and mechanical supports. If the galvanized steel has thinned to the point of failure or has holes from corrosion, we’ll show you and discuss replacement with written pricing.
No. Fogging wets the smog-and-dust film but doesn’t remove it. On rough galvanized surfaces, that moisture can actually feed microbial growth that wasn’t there before. We physically remove contamination with negative-air HEPA extraction and agitation tools, then seal. That’s the only approach that solves the problem without creating a new one.
We pressure-test the system and show you before-and-after photos of your own ducts. You should feel more even temperatures room-to-room, and your energy bills should reflect less waste. If anything seems off within a year, our 365-Day Done Right Promise covers a free return visit. Call (361) 326-5060 if you have concerns.
Ready to stop losing conditioned air and start breathing cleaner? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free, written estimate on duct sealing in San Bernardino. We’ll inspect your system, explain what we find, and give you one flat price before any work begins. No per-vent games. No fogging upsells. Just the job done right, backed for a full year.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving San Bernardino and the Inland Empire since 2004.