Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
See the difference
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After
Before
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Before
AfterHow Much Does Duct Repair & Sealing Cost in Downey?
A typical duct repair and sealing job in Downey runs $350 to $1,200, with most single-family homes landing near the $550 to $800 mark. Small repairs like a single disconnected joint or a re-taped plenum often come in under $400, while a full-house sealing of a leaky attic trunk system with mastic and mesh can push toward $1,500. Homes built before the 1980s, common across much of Downey, tend to sit at the higher end because the ductwork has usually seen more settling and rodent traffic.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what the line items actually cost in this market. These ranges assume the work is done by a duct specialist with professional-grade equipment (Rotobrush and Nikro systems for the cleaning side, mastic, mesh, and sealants for the repair side), not a general handyman with a roll of foil tape.
| Service | Typical Cost Range |
|---|---|
| Duct cleaning (full system, before repair) | $299 – $550 |
| Small repair (single joint, disconnected run, loose boot) | $180 – $400 |
| Sectional repair (cracked flex run, crushed section, torn insulation) | $350 – $750 |
| Duct sealing (mastic, mesh, and register boots) | $400 – $1,100 |
| Full-house duct sealing (attic and crawlspace) | $800 – $2,300 |
| Plenum sealing at the air handler | $250 – $500 |
| Dryer vent cleaning (safety add-on) | $150 – $275 |
What pushes you up the scale: attic access that’s tight or non-existent, flexible duct that’s been crushed by storage or pest damage, and multiple problem zones scattered across the system. What pulls you down: a single obvious leak, easy attic access through a pull-down stair, and a home where the ductwork was installed or replaced within the last 15 – 20 years. If the ducts also need a full clean before sealing (very common in Downey’s older bungalows and 1960s tract homes), that raises the total but saves you a return visit later. We schedule cleaning and repair in one trip whenever the job allows.
What Affects Duct Repair & Sealing Pricing in Downey
- Home age and duct material. The tract homes that went up across Downey in the 1950s and 1960s often still have original rigid metal ductwork with leaking seams, and the 1970s – 80s builds lean heavily on flex duct that’s now sagging or torn. Rigid duct leaks are usually cheaper to seal than flex that needs full section replacement.
- Attic conditions in the Downey climate. Attic temperatures here climb past 130°F on summer afternoons, which cooks flex duct over time and makes sealant adhesion a real consideration. That heat load is why we inspect the duct jacket and insulation rating, not just leaks, before quoting.
- Pest and rodent damage. Rodent activity in attics is a common cause of small tears and contamination in South LA County. When we find it, cleaning becomes mandatory before repair, or the new seal just holds the problem in.
- Accessibility. A single-story home with a wide pull-down attic stair prices out very differently than a low-slung roof space where the technician is crawling on hands and knees for 60 feet. Two-story homes and properties near downtown Downey with tight roof configurations run higher.
- System size. A 1,200 sq ft home with four registers is a much smaller sealing job than an 2,800 sq ft house with a zoned system and 12+ runs. Cost tracks the number of joints and boots, not just square footage.
- Air-quality add-ons. If the ducts get sealed and cleaned, some homeowners add a Honeywell or Aprilaire filtration or humidifier system at the same visit, which extends the investment but spreads the labor cost across one appointment.
Repair or Replace: Which Makes More Sense?
Repair makes sense when the ductwork is structurally sound and the leaks are localized: a disconnected joint, a crushed section, a boot that’s separated from the register. In those cases sealing and repairing preserves an otherwise good system for a fraction of replacement cost. Replacement starts to make sense when the ducts are original to a mid-century home, made of failing flex, or so contaminated and compromised that patching won’t hold. As a rule of thumb, if repair and sealing quotes come in above roughly half the cost of replacing that portion of the system, we’ll tell you so. Replacement pricing sits well above the guide above and depends on run count, attic access, and whether the system is zoned.
How to Save on Duct Repair & Sealing
Start with a free estimate and get the diagnosis in writing. A technician who climbs into the attic and shows you photos of the actual leaks is doing the job right. From there:
- Bundle cleaning and repair. Doing a full duct clean at the same visit as the repair removes the debris that would otherwise re-contaminate freshly sealed runs. One trip, one setup, less labor than two separate visits.
- Address the small leaks before they spread. A $200 joint fix today prevents a $900 sectional replacement next year. Rodent tears and loose boots get worse, never better.
- Fix the dryer vent at the same time. Dryer vent cleaning is a fire-risk service, not just a comfort one, and it shares the same equipment and trip. Most customers add it for the price of a single line item rather than paying a separate service call.
- Ask about air-quality upgrades only if they fit your problem. A Honeywell or Aprilaire filter or humidifier genuinely helps some homes; for others it’s an expense that doesn’t pay back. We’ll tell you which is which for your house.
- Seal the plenum and boots, not just the trunk. The biggest leakage losses are usually at the air handler plenum and behind the register boots. Ensuring those are sealed is where your money goes furthest.
Schedule a free estimate and we’ll walk the system with you. Call (855) 382-4683 to book a visit in Downey.
Why Professional Sealing Beats Tape and Caulk
Foil tape fails. It’s the reason so many Downey attics have a duct system that’s “sealed” with tape that dried out and peeled off years ago. Proper duct sealing uses mastic and mesh over cleaned surfaces, and the surfaces have to be cleaned before the mastic will stick. That’s why our repair visits start with the Rotobrush and Nikro equipment: get the contamination out, then seal onto a clean surface. We also stock Abatement Technologies air-filtration equipment, the same category of gear used in environmental remediation work, because duct repair in homes with rodent history or heavy dust load needs that level of filtration, not a shop vac. For the full scope of this service, see our Duct Repair & Sealing in Downey page.
What to Check Before You Book a Repair
You don’t need to climb into the attic. But you can spot the signs that repair is worth a look: rooms that never heat or cool as well as the rest of the house, dust settling on surfaces right after cleaning, a whistling or rushing sound at the registers, higher energy bills without a rate change, and visible dust streaks around the vent covers. If two or more of those are true, a duct inspection is worth the call. For a sense of what standard cleaning costs before any repair, our home page lays out the full service lineup.
We handle three services under one roof: Air Duct Cleaning, Dryer Vent Cleaning, and Air Duct Repair. That means when a repair reveals a cleaning problem, or a cleaning reveals rodent damage, the same technician and the same equipment are already on site. Most cleaners stop at the vent cover. We go further, because a repair on dirty ductwork doesn’t hold.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in Downey?
Duct sealing in Downey typically runs $400 to $1,100 for a standard home, and $800 to $2,300 for full-house sealing across attic and crawlspace. The price depends mostly on run count, attic access, and whether cleaning is needed first. Call (855) 382-4683 for a free estimate on your specific system.
Is it cheaper to repair or replace ductwork?
Repair is almost always cheaper when the leaks are localized: a single joint, a disconnected run, or a cracked section usually costs $180 to $750, while replacing a full system runs several times that. Replacement wins when the ducts are original mid-century metal or failing flex throughout. A free estimate will tell you which category your home falls into.
Can you repair and clean the ducts in the same visit?
Yes, and we recommend it. Cleaning before sealing is standard practice because mastic won’t bond to contaminated surfaces, and cleaning after repair risks re-contaminating fresh seals. Expect the combined visit to run $500 to $950 for a typical Downey home. Scheduling both together saves a service call and a setup charge.
How long does duct repair and sealing take?
Most Downey jobs finish in 3 to 6 hours. A single-joint repair is usually under 2 hours. Full-house sealing with cleaning takes the better part of a day, and longer if the attic access is tight. We’ll give you a time window when you book.
Does duct sealing actually lower energy bills?
Sealing leaks in the supply and return ducts can cut heating and cooling waste substantially, but the real number depends on how leaky your system is now. Homes with obvious disconnected joints and unsealed plenums see the largest savings. Call (855) 382-4683 and we’ll inspect the system and tell you whether sealing will pay for itself in your house.
Pricing reflects the Downey market as of 2026. Duct Cleaning Downey offers free estimates – call (855) 382-4683.
What Our Customers Say
"Found a disconnected run in the crawlspace while they were in there and told me about it rather than cleaning around it."
- Marco Herrera"Ran a negative air machine on the whole system rather than the shop vac on a stick that the cheap outfit down the road uses. Showed me the before and after photos from inside the trunk line and it was genuinely disgusting."
- Dana Novak"Two guys, about three hours, plastic down at every register, and they wiped the vent covers before putting them back."
- Nathan Ziegler