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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After
Before
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Before
AfterFast, Reliable Duct Sealing Across La Puente
Duct sealing in La Puente typically runs $1,200 – $2,800 for a whole-house job on a standard ranch-style home, with most projects completed in a single day. We dispatch crews from our Los Angeles office and regularly serve neighborhoods from Old Town La Puente north to the Hacienda Heights border, including the tract homes off Amar Road and the Valinda area. If your registers blow weak, your upstairs rooms never cool, or your summer electric bills keep climbing, the problem is often leaking ductwork, not your AC unit itself. Call (361) 326-5060 for a free estimate with a written price before any work starts.
Why Hollis Air Duct Cleaning Is La Puente’s Preferred Duct Sealing Company
We’ve been working in La Puente since 2004, and our Duct Sealing in La Puente crew knows what these 1950s-70s ranch tracts hide. Roy Castellanos built this operation on The Garrison Standard: written prices, written guarantees, and technicians who arrive inside the quoted window in uniform, background-checked, and accountable.
La Puente homeowners call us back because we map the duct paths that were never on any original plan. The 365-Day Done Right Promise covers every sealing job in writing. If a joint fails or a leak reopens within a year, 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.
Duct Sealing Services in La Puente
Duct Sealing Services in La Puente mean finding and closing the gaps, cracks, and disconnected joints that steal conditioned air before it reaches your rooms. In this city, that work usually starts with a camera inspection because so many homes have unpermitted garage conversions and room additions that rerouted original duct runs through walls and soffits with no documentation. A typical whole-house sealing job in La Puente runs $1,200 – $2,800 depending on system size and accessibility, with partial repairs on isolated problem zones starting around $450 – $850.
Leak Detection and Pressure Testing
We pressurize your duct system and measure air loss with calibrated gauges. In La Puente’s older tracts, we commonly find 20 – 35% leakage, much of it at flex-duct bends behind converted garages where the original installer never expected a wall to go. The test gives us a baseline and shows you exactly where your money is going before we seal a thing.
Mastic Sealing and Mechanical Joint Repair
We seal metal trunk lines with UL-181 rated mastic, not duct tape, which dries and fails in La Puente’s hot attic summers. Crushed flex runs get replaced or rerouted. Every joint is accessible for future inspection. We photograph before and after so you see the work, not just the invoice.
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 La Puente
Duct Insulation in La Puente addresses a separate problem from sealing, though the two jobs often pair together. Uninsulated or poorly insulated ductwork running through attics loses 10 – 30% of its cooling capacity to radiant heat before the air ever hits your registers. In a San Gabriel Valley summer where attic temperatures push 140°F, that’s real money every month from May through October. Duct insulation in La Puente typically costs $800 – $1,800 for a full system wrap, or $300 – $600 when bundled with sealing on the same visit.
Fiberglass Wrap and Reflective Barrier
We use R-6 or R-8 fiberglass insulation with vapor barrier for exposed trunk lines, plus reflective radiant barrier where attic geometry allows. This is standard commercial practice, not hardware-store blanket wrap. The material specs are written on your estimate.
Insulation Assessment During Sealing
While we’re in your attic mapping leaks, we flag insulation gaps at no extra charge. Many La Puente homeowners choose to bundle insulation with sealing because the crew is already there, the attic is already open, and the combined price is lower than two separate visits.
Trusted Brands We Service in La Puente
Our Duct Sealing crews carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration and sealing products from Aprilaire and Guardsman. We stock common duct diameters, mastic compounds, and flex-duct replacements so La Puente jobs don’t wait on parts orders. When a crushed run behind a converted garage needs replacement, we match the original diameter and R-value on the spot. The tools are commercial grade. The explanation is plain English.
Common Duct Sealing Problems We See in La Puente Homes
- Crushed flex duct at unpermitted addition junctions. Original 1960s flexible duct behind a converted garage or room addition collapses at the bend, so sealed joints upstream just push conditioned air into the crawl space instead of the room. We find this repeatedly in the ranch tracts off Francisquito Avenue and north of Old Town.
- Soot-like particulate mistaken for mold. Because of the Valley’s smog-trapping inversions, ductwork in La Puente often accumulates a fine, dark residue that homeowners read as mold but is actually pollution particulate. Cleaning it requires HEPA filtration and negative pressure, then sealing the leaks that pulled it in.
- Sealing without cleaning first. Some crews seal over dirty ducts, locking residue into the newly sealed run. We clean with HEPA-filtered Abatement units and rotary agitation before we seal, so the system stays clean inside.
- Supply-side-only sealing starving the return. Sealing the supply ducts without addressing return trunk leaks leaves the system unbalanced. The blower motor runs hotter all summer, and the cooling season here runs May through October. We test and seal both sides.
Pricing for Duct Sealing in La Puente, CA
Whole-house duct sealing in La Puente typically costs $1,200 – $2,800. Partial repairs on isolated problem zones run $450 – $850. Duct insulation adds $800 – $1,800, or $300 – $600 when bundled with sealing. What moves the price: system size, attic accessibility, whether we need to open soffits or access panels to reach hidden runs, and the condition of existing flex duct. Homes with unpermitted additions take longer to map and often need more material. We give you one flat price per system, agreed in writing before any work starts. No per-vent pricing. No add-ons at the door. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near La Puente
Our crews work throughout the San Gabriel Valley, including West Covina, Hacienda Heights, Rowland Heights, and Walnut. Each job follows The Garrison Standard: written price, written guarantee, background-checked uniformed technicians, and the 365-Day Done Right Promise.
Serving La Puente, CA - Our Local Coverage Area
We’re based in the La Puente 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 La Puente
Sealing costs more in these homes because the duct path was altered without permits or plans, so we spend extra time mapping runs with cameras and access holes. We often find crushed flex at the addition junction that needs replacement, not just sealing. The $1,200 – $2,800 range accounts for this diagnostic and repair work. Call (361) 326-5060 for a free estimate on your specific layout.
It’s usually not mold. La Puente’s position in the San Gabriel Valley traps smog and particulate from freeway traffic and regional inversions, and that fine dark residue collects in ductwork over years. We confirm with inspection, then clean with HEPA-filtered negative air before sealing the leaks that pulled it in. Call (361) 326-5060 if you’re seeing this on your registers.
We recommend cleaning first, then sealing. Sealing dirty ducts traps debris inside, and La Puente’s particulate load is heavy enough that skipping the clean shortens the life of the seal. We bundle both services and price them together. The combined approach typically runs $1,500 – $3,200 depending on system size. Call (361) 326-5060 for a written quote.
Sealing stops dust from entering through leaks in the return side, but it won’t remove what’s already inside. In multi-generational homes with heavy occupancy and year-round HVAC use, we usually recommend cleaning plus sealing for lasting results. The sealed system then filters air properly instead of pulling attic and crawl-space debris. Call (361) 326-5060 to discuss your household’s usage pattern.
We pressure-test and inspect the entire supply trunk, all branch runs, the return trunk, the return plenum, and the junctions at the air handler. In La Puente’s older homes, we pay special attention to flex-duct bends behind additions and converted garages where original runs were rerouted. Every leak location is photographed and shown to you before we seal. Call (361) 326-5060 to schedule.
A homeowner near Del Valle Park on a heavily run 1970s unit was pulling soot-like film onto the registers each summer, so we ran camera inspection and found a sagging original run behind an unpermitted converted garage; we built negative pressure with a HEPA-filtered Abatement unit, used agitation tools to free the fine pollution particulate, then sealed the crushed run and tied the garage supply into the main trunk – register dust dropped off noticeably within the week.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving La Puente since 2004.