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 Claremont
Duct sealing in Claremont typically runs $800 – $2,400 for a whole-home system, with most jobs completed in a single visit after a written estimate. If you’re seeing dust puff from your registers when the air handler starts, or your upstairs rooms never cool evenly, the problem is usually air leaking from ducts before it reaches your living space.
We serve Claremont from our Los Angeles dispatch office, with crews running the 210 corridor daily to neighborhoods from College Heights to the northside ranch properties along Base Line Road. Roy Castellanos and our team have worked on enough Claremont homes to know the difference between a standard tract-house seal job and the converted gravity-furnace ductwork you’ll find in the bungalows near the colleges. We arrive inside the quoted window, price the work in writing before we touch anything, and leave the site clean. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Claremont’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. Our Claremont customers know us for showing up when we said we would and for the 365-Day Done Right Promise that backs every seal job in writing. If the mastic fails, a seam reopens, or the static pressure doesn’t hold, we come back at no charge. That includes a free second visit, not a negotiation.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops, no callback queues, no waiting until Monday morning to schedule.
We’ve earned our reputation in Claremont by handling the specific problems this city’s housing stock creates: the old sheet-metal runs in 1920s bungalows, the asbestos-wrapped ducts in post-war ranch homes, the alluvial silt that Santa Ana winds drive into poorly sealed return plenums. Our Duct Sealing team doesn’t treat your home like every other job.
Duct Sealing Services in Claremont
Duct Sealing Services in Claremont address a problem most homeowners don’t know they have: conditioned air escaping through gaps, disconnected joints, and failed seams before it ever reaches your rooms. In a typical Claremont home, 20 – 30% of heated or cooled air leaks into attics, crawlspaces, or wall cavities. That shows up as uneven temperatures, dust from the attic blowing through registers, and utility bills that climb every summer when your system runs overtime to compensate.
Because Claremont sits at the base of the San Gabriel Mountains, Santa Ana winds and alluvial dust from the mountain washes push fine mineral silt into attic and crawlspace duct systems. The hot, dry summers, often over 95°F from May through October, mean HVAC systems run heavily for half the year, accelerating both dust accumulation and the thermal expansion that loosens duct seals over time. A typical whole-home duct sealing job in Claremont runs $800 – $2,400, depending on system size, accessibility, and whether we find disconnected runs that need reconnection before sealing.
Return-Side Leak Repair
The return side of your duct system pulls air from your home back to the air handler. When these ducts leak, they suck in attic dust, crawlspace dirt, and garage fumes. In Claremont’s pre-1980s homes, we regularly find return plenums with failed seams or disconnected flex duct that has been pulling alluvial silt for years. We seal these with mastic and fiberglass mesh, then verify the fix with a static pressure test.
Supply Register and Boot Sealing
Supply boots, the metal connections between your duct trunk and the wall or floor register, often separate from drywall over decades of thermal cycling. We resecure and seal these with high-temperature mastic so conditioned air goes into your room, not your wall cavity. This is especially common in Claremont’s 1970s – 1990s tract developments where original construction used minimal sealant.
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 Claremont
Duct Insulation in Claremont protects the air you’ve already paid to heat or cool as it travels through unconditioned spaces. In summer, attic temperatures in Claremont can exceed 140°F. Uninsulated or poorly insulated ducts lose capacity fast. Your system runs longer, wears faster, and still can’t keep the master bedroom comfortable.
We install R-6 to R-8 fiberglass duct wrap with a reinforced foil vapor barrier, sealed at every seam with matching foil tape. For Claremont homes with asbestos-wrapped ducts, we coordinate proper handling before any insulation work begins. A typical duct insulation job in Claremont runs $1,200 – $3,000 for a whole system, with smaller partial jobs starting around $600. We price by the system, not by the linear foot, so you know the total before we start.
Attic Duct Wrap and Vapor Sealing
Attic ducts in Claremont bake half the year. We wrap supply lines with foil-faced fiberglass, seal every seam and penetration, and verify that the vapor barrier faces outward to prevent condensation during rare humid periods. Properly wrapped ducts can reduce cooling losses by 30% or more.
Crawlspace Duct Protection
Crawlspace ducts face different threats: ground moisture, rodent activity, and the alluvial dust that settles through foundation vents. We inspect for damage, seal with mastic, then wrap or rewrap with insulation rated for below-grade use. In Claremont’s older homes near the colleges, we often find original asbestos wrap that needs careful assessment first.
Trusted Brands We Service in Claremont
Our crews carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, with filtration products from Honeywell, Aprilaire, and Guardsman. These are the same tools commercial HVAC contractors use, not hardware-store attachments. For Claremont homeowners, that means we can handle everything from a standard fiberglass flex-duct seal to the rigid sheet-metal runs in a converted 1940s gravity furnace system. We stock mastic, fiberglass mesh, foil tape, and insulation wrap sized for residential ductwork, so most jobs don’t wait on parts. When we find a disconnected run or a failed plenum that needs more than sealant, we have the fittings and the expertise to fix it in the same visit.
Common Duct Sealing Problems We See in Claremont Homes
- Mastic failure over alluvial silt. When previous crews or DIY attempts applied mastic or tape over dust-coated sheet metal, the seal never bonded properly. Within a season, the mastic peels and the return leak reopens. We clean every surface with a degreasing solvent and wire brush before applying new mastic.
- Disconnected runs in converted gravity-furnace systems. In College Heights and Old Claremont, the original 1920s – 40s gravity furnaces were later converted to forced-air, but the old ducts were rarely resized or fully sealed. Technicians who skip camera inspection miss disconnected runs in crawlspaces that a simple trunk-line seal won’t fix.
- Asbestos-wrapped ducts disturbed or hidden. Some Claremont homes still have asbestos-wrapped ducts from mid-century construction. Untrained crews either disturb the wrap without proper handling or seal over it, hiding the problem and creating a larger hazard. We assess before we touch.
- Outbuilding and detached-garage systems ignored. Properties on Claremont’s rural edges often have shop, studio, or guest-house systems on longer service drives. These ducts load with dust and can backfeed into the main house system if returns are interconnected. We inspect the whole property, not just the main house.
Pricing for Duct Sealing in Claremont, CA
A typical whole-home duct sealing job in Claremont runs $800 – $2,400. Duct insulation runs $1,200 – $3,000. Smaller partial systems or single-problem repairs start around $400. What moves you within these ranges: system size (a 3-ton system has more ductwork than a 2-ton), accessibility (crawlspace work takes longer than attic work), and whether we find disconnected runs or asbestos-wrap complications that need additional handling.
We give one flat price per system, agreed in writing before any work starts. No per-vent pricing. No add-ons at the door. You’ll see the total on paper, and that number doesn’t move. We also provide before-and-after photos of your own ducts so you know the work was done. Call (361) 326-5060 for a free estimate. Estimates include a full camera inspection and static pressure reading.
We Also Serve Cities Near Claremont
Our crews run daily to Montclair, La Verne, Upland, and Ontario. Each city has different housing stock and different duct problems. Upland’s newer construction faces fewer gravity-furnace conversions but more flex-duct degradation from thermal cycling. La Verne’s hillside homes deal with longer duct runs and greater static pressure challenges. Wherever you are in the Pomona Valley, we apply the same standard: written price, written guarantee, work done by the book.
Serving Claremont, CA - Our Local Coverage Area
We’re based in the Claremont 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 Claremont
Every 3 – 5 years for inspection, with sealing as needed when leaks are found. Homes near the San Gabriel Mountain washes, especially pre-1980s construction with original ductwork, should be inspected every 3 years because Santa Ana winds reload alluvial silt into return leaks faster than in areas with newer, tighter construction. Call (361) 326-5060 to schedule an inspection and we’ll give you a written condition report.
Because the root problem is disconnected sheet-metal runs and failed plenum seams in converted gravity-furnace systems, not loose debris that a vacuum can remove. A Rotobrush agitation tool can clean the duct interior, but if the return is still pulling attic air through a gap, the dust returns within weeks. Sealing comes first; cleaning follows. Call (361) 326-5060 and we’ll camera-inspect to show you exactly where your system is leaking.
Ask whether they will inspect for asbestos wrap, how they handle it if found, and whether they include that contingency in their written price. A crew that brushes past the question or plans to seal over the wrap is creating a larger problem. We assess every Claremont home built before 1980 for asbestos-wrapped ducts and coordinate proper handling before any seal or insulation work begins. Call (361) 326-5060 to discuss your home’s specific situation.
Yes, significantly, but only when the sealing addresses return-side leaks where outdoor dust enters the system. Santa Ana winds drive fine mineral silt through gaps in return plenums and disconnected runs; sealing those entry points stops the infiltration at its source. Sealing supply leaks alone won’t solve a return-side dust problem. Our Claremont jobs include full-system pressure testing to find every leak, not just the accessible ones. Call (361) 326-5060 for an inspection that targets your specific dust source.
Yes, if you tell us about them when you schedule. Outbuilding and detached-garage systems around Claremont’s rural edges are often on longer service drives, and some crews skip them to save time. We don’t. These systems can backfeed dust into the main house if returns are interconnected, and their leaks can make your main-house seal job look like a failure. We price the whole property, not just the main house. Call (361) 326-5060 and tell us about every system you need inspected.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Claremont and the Pomona Valley.