Fast, Reliable Duct Repair & Sealing Across Pomona
Duct repair and sealing in Pomona typically costs $280-$680 for most residential jobs, with same-day service available throughout the 91766, 91767, and 91769 ZIP codes. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to Pomona since 1984 - long before the SR-60 corridor became the diesel freight artery it is today. Our technicians know the difference between a Phillips Ranch Road split-level and an Edison Historic District retrofit, and we carry the parts to fix both. If your vents are blowing weak, your attic ductwork has gone soft, or you’re seeing that dark gray dust settle on furniture within days of cleaning, call us at (844) 685-6342. We’ll answer live, dispatch from our Los Angeles base, and most repairs are finished in one visit.
Why Bellows Air Duct & Vent Co. Is Pomona’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Pomona the same way we built it everywhere else: by showing up when we say, pricing the job before we start, and standing behind it for 90 days with no paperwork if something needs attention. Homeowners along East Foothill Boulevard and in the neighborhoods near Hilda Solis/Dolores Huerta tell us the same thing - they called us after a low-bid operator changed the price at the door or vanished when the dust came back.
Our response time to Pomona averages under 90 minutes during business hours. We know which streets flood the attic access with afternoon heat, which post-WWII tracts have the original undersized sheet-metal runs, and why that matters for how we approach sealing. Every technician is background-checked, uniformed, and equipped with camera inspection gear from Rotobrush and Abatement Technologies - the same brands serious HVAC contractors specify. You’ll see the before-and-after footage yourself. No claim without proof.
Ray Castillo, who leads Bellows, set the rule in 1984: one honest price shown before a single tool is lifted. The number on the phone is the number on the invoice. Our Duct Repair & Sealing team has handled everything from crushed flex runs in Walnut-adjacent ranch homes to full mastic resealing of 1950s metal systems in the Edison Historic District. We don’t bait with coupons and we don’t upsell what you don’t need.
Our Duct Repair & Sealing Services in Pomona
Mastic Sealant Application
Mastic is the only proper way to seal sheet-metal joints and plenum connections in Pomona’s older housing stock. Duct tape dries and fails; mastic stays flexible. In Pomona specifically, we apply mastic heavier along the northern-facing duct runs that take the brunt of Santa Ana wind pressure. A typical mastic sealing job for a 1,200-square-foot Pomona tract home runs $280-$450, and we verify every seam with camera inspection before we close the attic hatch.
Metal Duct Repair
Original sheet-metal ducts in Pomona’s post-WWII homes - the ones built between the late 1940s and early 1970s - are reaching the end of their service life. Slip joints corrode. Original steel-tape seals fail. We repair these systems in place when possible, replacing damaged sections with matching gauge metal and resealing with mastic. Where the original routing is too degraded, we’ll tell you straight whether repair or partial replacement makes sense. Metal duct repair in Pomona typically ranges from $320 for isolated joint work to $680 for multi-section replacement in larger homes near Phillips Ranch Road.
Air Leak Repair
Leaky ducts pull attic air into your living space. In Pomona, that attic air carries a specific load: diesel particulates from the SR-60/SR-57/I-10 convergence, wildfire ash during Santa Ana events, and plain desert dust. We pressure-test the system, locate leaks with smoke pencil and thermal imaging, then seal them properly. Homes along Arrow Highway and Mission Boulevard show the worst infiltration - we’ve seen supply registers loaded with black debris within weeks of inadequate sealing. Air leak repair in Pomona starts around $240 for targeted sealing and runs to $520 for whole-system work.
Flex Duct Repair & Replacement
Flex duct degrades fastest where Pomona’s attic temperatures regularly exceed 140°F. The inner liner cracks. The insulation compresses. We replace crushed or torn flex runs with properly sized, insulated flex duct - never the cheap thin-wall stuff - and support it correctly so it doesn’t sag and trap debris. Flex duct repair in Pomona runs $180-$340 per run, depending on attic access difficulty.
Duct Insulation Repair
Compromised insulation means condensation in summer, heat loss in winter, and your HVAC working harder for longer. In Pomona’s inland climate, where cooling systems run far more hours than coastal LA units, proper insulation pays back fast. We repair or replace damaged insulation wraps, typically $220-$380 for partial work and $480-$720 for full attic duct reinsulation.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
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.
Trusted Brands We Service in Pomona
We stock parts and specify equipment from Rotobrush, Abatement Technologies, and Aprilaire - brands that hold up in Pomona’s heat and particulate load. Rotobrush camera systems let us document every joint and seam we seal. Abatement Technologies HEPA containment protects your home during aggressive repairs. Aprilaire media filters integrate with sealed systems to maintain the improvement we deliver. We don’t source from warehouse surplus or generic catalogs. When a Pomona homeowner needs a specific fitting for a 1960s metal trunk line, we carry it or we get it fast - no waiting two weeks while your system runs half-open.
Common Duct Repair & Sealing Problems We See in Pomona Homes
- Failed steel-tape joints on original metal ducts. The post-WWII tract homes dominating Pomona’s 91766 and 91767 ZIP codes used steel tape and cork-based sealants that crumble after 50+ years. Once the seal fails, the negative pressure in return ducts pulls attic air straight into your system - and in Pomona, that air carries diesel soot.
- Crushed or disconnected flex runs in 140°F attics. Flex duct near attic access hatches and along rooflines degrades fastest. We regularly find completely detached runs in Pomona homes, blowing conditioned air into the attic and pulling contaminated air back through leaks.
- Santa Ana wind recontamination through unsealed gaps. Fall Santa Ana events funnel desert dust and wildfire ash through any duct leakage point. We’ve cleaned systems in September that were loaded again by November because sealing wasn’t addressed the first time.
- Non-standard retrofit routing in Edison Historic District homes. Pre-1940s homes where ductwork was added after construction often have tight bends, shared joist bays, and inaccessible joints. Standard sealing approaches don’t work. We adapt.
Pricing for Duct Repair & Sealing in Pomona, CA
Here’s what duct repair and sealing costs in Pomona’s market right now:
| Service | Typical Range |
|---|---|
| Targeted air leak sealing (smoke pencil + mastic) | $240-$380 |
| Mastic sealing of full sheet-metal system | $280-$450 |
| Flex duct repair/replacement (per run) | $180-$340 |
| Metal duct section repair or replacement | $320-$680 |
| Duct insulation repair (partial) | $220-$380 |
| Full attic duct reinsulation | $480-$720 |
What moves the price: attic accessibility, extent of contamination requiring pre-cleaning, and whether we’re working with original metal or retrofitted flex. We inspect with camera before quoting, so you see what we see. Every estimate is free, presented upfront, and valid for 30 days. We also honor our standing offers: $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount.
We Also Serve Cities Near Pomona
Our Duct Repair & Sealing in Pomona coverage extends to San Dimas, La Verne, Diamond Bar, and Walnut - the same truck corridor, the same housing stock, the same particulate challenges. If you’re in one of these cities and seeing the same black dust or weak airflow, we cover you with the same response time and the same 90-Day Done Right Promise.
Serving Pomona, CA - Our Local Coverage Area
We’re based in the Pomona 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 - Duct Repair & Sealing in Pomona
Your ducts are pulling in diesel exhaust particulates from the SR-60/SR-57/I-10 freight corridor, then redepositing them through leaks that cleaning alone doesn’t fix. In Pomona, the San Gabriel Mountains trap this particulate-laden air in the valley, so infiltration happens faster than in upwind cities like Pasadena. We see this signature dark gray-to-black debris in homes along Arrow Highway and Mission Boulevard regularly. The fix is sealing the leaks that draw attic air inward, not just cleaning what’s already inside. Call (844) 685-6342 for a camera inspection - estimates are free.
Yes, in most cases we repair original sheet-metal ducts in place, replacing failed steel-tape joints with mastic and patching corroded sections with matching gauge metal. Pomona’s post-WWII tract homes were built with decent metalwork - the problem is the seals, not the steel. We recently handled exactly this in the Edison Historic District: a 1952 system with original steel-tape joints failed, drawing black diesel soot from the SR-60 corridor into the living room supply. We sealed all seams with mastic and replaced a crushed flex run near the attic access, restoring balanced airflow and reducing visible dust within days. If the metal itself is too far gone, we’ll tell you straight. Call for an inspection.
Santa Ana winds pressurize your attic and force desert dust, wildfire ash, and dry particulate through any unsealed duct gap or failed joint. In Pomona, these winds come from the east-northeast, hitting the north-facing roof slopes and attic vents hardest. Duct systems sealed inadequately in September can show visible reloading by November. We account for this by sealing more aggressively along windward duct runs and using mastic rated for thermal cycling, not just summer heat. If your ducts were cleaned but not sealed, the Santa Anas will undo the work. Call (844) 685-6342 - we can assess your vulnerability.
Yes - Pomona’s inland location pushes summer highs above 100°F regularly, and attics exceed 140°F. Compromised insulation means your HVAC runs longer, works harder, and still can’t maintain setpoint. We see compressed, water-stained, or rodent-damaged insulation in older Pomona homes constantly, especially in the 91766 and 91767 ZIP codes where original installs are 50+ years old. Repairing or replacing duct insulation typically pays back within two cooling seasons here. We offer a free thermal check with any duct repair estimate.
Yes - we’ve worked extensively in the Edison Historic District, where pre-1940s homes have retrofitted ductwork routed through tight joist bays, shared wall cavities, and other non-standard paths. These systems require adapted access and hand-applied mastic in spaces standard tools won’t reach. We don’t force a one-size-fits-all approach. Our technician will camera-inspect the routing, explain what’s accessible and what isn’t, and quote accordingly. The 90-Day Done Right Promise applies either way. Call (844) 685-6342 to schedule.
Ready to stop the dust and get your airflow back? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate on duct repair and sealing in Pomona. We’ll answer live, dispatch fast, and show you the camera footage before we quote. Done right - and backed in writing for 90 days.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Pomona since 1984.