Fast, Reliable Duct Repair & Sealing Across Fresno
Duct repair and sealing in Fresno typically costs $180–$650 depending on whether you’re sealing accessible joints with mastic or replacing collapsed flex runs, and most jobs are completed in a single visit. We’re Landmark Air Duct Cleaning Service California, and our Duct Repair & Sealing team works throughout Fresno’s 93714, 93715, 93716, and 93717 ZIP codes — from the 1950s tract homes near Olive Avenue to the newer flex-duct subdivisions north of Herndon Avenue. Richard Anderson, our owner and lead technician, brings 14 years of focused air-duct experience to every Fresno job, backed by a 4.9-star average across 364+ verified reviews. Call (833) 958-5022 for a free estimate — we’ll give you straight numbers and show up when we say we will.
Why Landmark Air Duct Cleaning Service California Is Fresno’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Fresno by doing what we say we’ll do — Richard Anderson leads every job personally, not some crew you’ve never met. That matters in a market flooded with franchise duct cleaners who subcontract to whoever’s available that week.
Our 4.9-star rating across 364+ verified customer reviews didn’t come from cherry-picking favorites. It came from showing up on time, using real professional equipment — Rotobrush rotary brush systems and Nikro negative-air extractors, not shop vacs with sales pitches — and fixing the actual problem instead of inventing new ones.
We know Fresno’s housing stock because we’ve worked in it for years. Richard has crawled through the tight, low-clearance attics of central Fresno townhomes where rooftop HVAC units feed shared duct chases, and he’s replaced sagging flex runs in north Fresno’s 1990s subdivisions where the San Joaquin Valley’s agricultural dust load is relentless. That local knowledge saves time and money — we diagnose faster because we’ve seen your exact setup before.
From our base in Bell, we schedule dedicated Fresno service days with realistic drive-time built in. You’re not waiting for a technician who’s “in the area” — you’re on the calendar with arrival windows we honor.
Our Duct Repair & Sealing Services in Fresno
Duct Sealing
Leaky ductwork in Fresno doesn’t just waste money — it pulls unfiltered San Joaquin Valley air straight into your living space. We seal supply and return plenums, register boots, and trunk-line connections using professional-grade methods that hold up to Fresno’s extreme thermal cycling. A typical duct sealing job in Fresno runs $180–$340 for accessible systems, with most completions taking 2–3 hours. We test our work with pressure verification so you know the seal is real, not guessed.
Flex Duct Repair
North Fresno’s 1990s and 2000s build-outs are full of flex duct runs that sag between joists, creating low-point debris traps exactly where agricultural PM2.5 particulate settles during harvest season. We’ve replaced crushed, torn, and rodent-damaged flex ducts throughout the 93720 and 93730 areas, installing properly supported runs with sealed collars. Flex duct repair in Fresno typically ranges from $220–$480 per run depending on length and attic accessibility. The fix isn’t just replacement — it’s correcting the support failures that caused the sag in the first place.
Metal Duct Repair
Central and west Fresno’s 1950s–1970s tract homes — the ones off Olive Avenue, Belmont Avenue, and around Roeding Park — often have original sheet-metal ductwork that’s endured decades of thermal stress. Metal expands in 105°F summer afternoons and contracts when Tule fog rolls in, fatiguing seams until they whistle air into your attic. We repair separated seams, replace rusted sections, and reinforce weak points. Metal duct repair in Fresno generally runs $280–$550, with older systems sometimes requiring custom-fabricated transitions that we build on-site.
Duct Insulation
Fresno’s attic temperatures regularly exceed 140°F in July and August, and uninsulated or degraded duct insulation bleeds cooling capacity before conditioned air ever reaches your rooms. We install fresh fiberglass-wrap or foil-faced insulation on repaired and sealed ducts, sized to California Title 24 standards. Duct insulation in Fresno typically adds $150–$320 to a sealing or repair job, and the payback through reduced runtime is measurable in this climate — your AC doesn’t run 14 hours a day because it wants to.
Mastic Sealant Application
We use mastic sealant — a thick, fiber-reinforced paste that cures to a permanent flexible seal — on every metal joint we touch. Unlike foil tape, which degrades in Fresno’s attic heat within a few seasons, mastic moves with the duct and maintains its seal through thousands of thermal cycles. We apply it with proper joint preparation: clean surfaces, adequate coverage, and cure time before pressurization. This is standard on our jobs, not an upsell.
Air Leak Repair
Disconnected ducts, failed register boots, and corroded plenum connections are common in Fresno homes where original installations have aged through 60+ harvest seasons. We locate leaks with visual inspection and pressure testing, then repair with appropriate materials — mastic and mechanical fasteners for metal, proper collars and supports for flex. The goal is restoring designed airflow, not just patching symptoms.
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.
Trusted Brands We Service in Fresno
We work with Honeywell and Aprilaire components regularly — these are the filtration and zoning systems we encounter in Fresno’s higher-end installations and retrofits. For remediation and containment work, we use Abatement Technologies HEPA equipment when duct conditions require controlled environment protocols. We don’t name-drop brands to impress you; we mention them because we stock common Honeywell and Aprilaire replacement parts and can source Abatement Technologies components without the multi-week delays that leave Fresno homeowners waiting through another heat wave. Our Rotobrush and Nikro systems are the same tools commercial restoration contractors use — there’s no “residential grade” shortcut in our van.
Common Duct Repair & Sealing Problems We See in Fresno Homes
- Flex ducts in north Fresno’s 1990s builds sag and create low-point debris traps that collect agricultural PM2.5, leading to mold colonization when Tule fog season introduces weeks of high humidity. The fix is proper support spacing and sometimes rerouting for positive drainage.
- Metal duct seams in 1950s central Fresno homes fail after decades of thermal cycling from 105°F summers to cool, damp Tule fog conditions. Air leaks waste cooling and draw in unfiltered attic dust — we see this constantly in the 93701–93706 ZIP codes.
- Rooftop duct connections in townhomes loosen from wind and vibration, requiring mastic sealing that’s often overlooked by generalist cleaners who don’t carry proper access equipment or coordination experience with shared-building HVAC.
- Return-air plenums visibly cake with fine field dust during harvest season — August through October when almonds, cotton, and raisin grape operations across Fresno County spike particulate concentrations. Homeowners with worn duct seals or undersized filters can see this buildup within a single season, a failure mode that simply doesn’t exist in non-agricultural metros.
Pricing for Duct Repair & Sealing in Fresno, CA
| Service | Typical Range in Fresno | What Affects Cost |
|---|---|---|
| Duct sealing (mastic, accessible joints) | $180–$340 | Linear feet of duct, attic accessibility, number of leaks found |
| Flex duct repair/replacement (per run) | $220–$480 | Run length, attic clearance, support correction needed |
| Metal duct repair (seams, sections) | $280–$550 | Extent of rust/separation, custom fabrication, accessibility |
| Duct insulation (add to repair) | $150–$320 | Linear feet, insulation R-value, existing removal |
| Rooftop/townhome duct access and seal | $320–$650 | Coordination complexity, safety equipment, shared-space protocols |
These are real Fresno market ranges based on local labor costs, attic conditions typical to our housing stock, and the particulate load that makes this work more demanding here than in cleaner-air regions. We don’t quote over the phone for complex jobs — we’ll inspect your system and give you a written, itemized estimate with no obligation. Call (833) 958-5022 to schedule.
We Also Serve Cities Near Fresno
We run dedicated service routes to Clovis, Old Fig Garden, Sanger, and Fowler — the same Richard Anderson-led crews, the same Rotobrush and Nikro equipment, the same direct accountability. If you’re in these communities and dealing with San Joaquin Valley dust loading, Tule fog moisture issues, or aging ductwork, we cover your area without the franchise markup or subcontractor roulette.
Serving Fresno, CA — Our Local Coverage Area
We’re based in the Fresno 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 Fresno
Fresno’s position in the San Joaquin Valley air basin — consistently ranked by the American Lung Association as the most polluted in the United States — means your ducts ingest far more fine PM2.5 particulate than systems in cleaner regions. This accelerates filter loading, increases pressure differentials that force leaks open, and deposits abrasive dust at seal points that would last years elsewhere. We seal more aggressively here because the consequences of a marginal seal are worse — and we see the proof every late fall when homeowners call with return plenums caked in harvest-season dust. Call (833) 958-5022 and we’ll assess whether your current seals are holding against this load.
Yes — flex duct is actually more vulnerable in Fresno’s conditions than many homeowners realize. The 1990s–2000s subdivisions north of Herndon Avenue commonly use flex runs that sag between supports, creating debris traps where agricultural dust settles and Tule fog moisture later promotes mold. Flex also degrades from UV exposure if any portion runs through unconditioned attic space near vents or gable ends. We inspect for support spacing, collar integrity, and sag points — repairs typically run $220–$480 per run. Call (833) 958-5022 for a free inspection.
Yes, and this is specifically work we handle that generalist cleaners often decline. In central Fresno neighborhoods like 93701, many townhomes have rooftop HVAC units with ducts running through shared attic spaces — tight, low-clearance environments that require coordinating access with neighbors and navigating safely around structural constraints. Richard Anderson has done this work personally, bringing proper safety equipment and the patience to work within shared-building protocols. These jobs run $320–$650 depending on coordination complexity. Call (833) 958-5022 to discuss your specific building layout.
For Fresno’s conditions, we recommend a professional duct inspection every 3–4 years — more frequently if your home is pre-1980 with original metal ductwork, or if you’ve noticed uneven cooling, dust accumulation at registers, or musty odors during Tule fog season. The agricultural dust load here simply justifies closer attention than national averages suggest. We patched a torn flex duct in a 1970s tract home off Olive Avenue in 93701 where the return plenum was caked with fine almond-field dust from the harvest window. Using Rotobrush equipment and mastic sealant, we sealed three leaking joints and insulated a sagging run to prevent future debris traps. Call (833) 958-5022 to schedule an inspection — estimates are free.
We use professional-grade fiber-reinforced mastic compounds formulated for the thermal cycling extremes of Central Valley climates — products that maintain flexibility from 140°F attic peaks down to Tule fog season dampness. We don’t buy hardware-store buckets; we source through HVAC supply houses that stock compounds rated for the temperature swings Fresno ducts endure. The specific formulation varies by application — high-velocity trunk lines get different treatment than low-pressure returns — and Richard Anderson selects based on what your system needs, not what we have excess inventory of. Call (833) 958-5022 and we’ll explain what we’re using on your job and why.
Ready to fix your Fresno ductwork? Call Landmark Air Duct Cleaning Service California at (833) 958-5022 for a free, no-obligation estimate. Richard Anderson will inspect your system, explain what we’re seeing, and give you straight numbers — no upselling, no scare tactics, just 14 years of focused duct expertise applied to your home.
Written by Richard Anderson, Owner at Landmark Air Duct Cleaning Service California, serving Fresno since 2010.