Duct Repair & Sealing in Fresno - Tested First, Written Price Second

Fast, Reliable Duct Repair & Sealing Across Fresno

Duct repair and sealing in Fresno typically runs $340-$780 for a whole-system job, depending on whether we’re re-supporting crushed flex runs or sealing accessible metal ductwork with mastic. We dispatch crews to Fresno from our Houston coordination office, and every job starts with a camera inspection of your supply and return ducts - not a price-per-vent pitch. Call (346) 253-1822 for a written estimate before any work begins.

Call (346) 253-1822

We’ve worked in Fresno subdivisions from Teal Bend to the newer builds near FM 521 since 2013. The housing stock here is almost exclusively 2000s-2010s tract homes with flex duct routed through unconditioned attics. That matters because those attics hit 140°F in July and August, and after a decade of heat cycling, the builder-grade support hangers fail before the ducts get dirty. Our Duct Repair & Sealing team finds crushed runs on roughly half the Fresno jobs we inspect. A clean duct with a kinked run still chokes your airflow and short-cycles your blower motor.

Why CleanRun Air Duct Cleaning Pearland Is Fresno’s Preferred Duct Repair & Sealing Company

CleanRun is independently owned and operated under the Haven Standard, established in 2013. We’ve served over 52,000 homes, every one with a written price before work started and a documented photo record when the crew left. In Fresno specifically, our reputation rests on one thing: we show customers what we found before we talk about what needs to happen.

Fresno homeowners research before they call. They want to see license numbers, equipment brands, and proof the work was done. We publish our license, name our tools - Rotobrush agitation systems, Nikro negative-pressure extractors, Guardsman sealants - and deliver before-and-after photos of your own ducts as a standard job record, not an upsell. Haven Standard Clause 1 requires a written price before any work starts. No exceptions.

Our crews are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews. The 365-Day Done Right Promise is backed in writing on every job. If it’s not right, we make it right. Not a policy subject to manager approval. A written guarantee.

We also offer a Free Second Opinion on any written estimate. Bring a competitor’s quote. We’ll put our number next to it in writing.

Our Duct Repair & Sealing Services in Fresno

Flex Duct Repair

This is the service we perform most often in Fresno. The subdivision building boom of the 2000s and 2010s produced thousands of homes with flex duct hung on minimal support hangers to cut costs. After ten to fifteen summers in 140°F attics, those hangers fail. The duct sags, kinks against trusses, or collapses entirely. The register in your ceiling might look fine, but the run behind it is crushed flat.

Our process: camera inspection first, then repair or replacement of damaged flex sections with proper support hangers and tension straps. We re-route where necessary to eliminate kinks. Every repaired run is photographed before and after. Typical flex duct repair in Fresno runs $280-$520 per system, priced flat after inspection.

Duct Sealing

Sealing is critical in Fresno’s humidity belt. Dew points above 70°F from May through October mean any leak in your attic ductwork pulls warm, moist air into the system. When that humid air hits the cool duct surface during AC operation, condensation forms. Condensation seeds mold. We’ve opened duct systems in Fresno homes where the boot collar seal had failed years ago and the surrounding insulation was black with microbial growth.

We seal accessible joints, boots, and plenum connections with mastic sealant - not tape, which degrades in attic heat. For metal ductwork, we apply mastic in a continuous coat and reinforce with mesh where gaps exceed 1/8 inch. Duct sealing in Fresno typically runs $340-$580 for a whole-system job.

Metal Duct Repair

Some Fresno homes, particularly earlier builds near the original town center, use galvanized metal trunk lines with flex branch takeoffs. Metal ducts don’t crush, but they corrode at seams and can separate at joints after years of thermal expansion. We repair separated seams, patch corroded sections, and seal with mastic rated for metal substrate. Where damage is extensive, we replace sections with new galvanized duct and transition properly to existing flex runs. Metal duct repair in Fresno generally falls between $380-$680.

Duct Insulation

When we repair or replace flex duct in Fresno attics, we always assess insulation condition. The same heat and humidity that degrades duct liners breaks down insulation vapor barriers. Wet or compressed insulation loses R-value and becomes a mold substrate. We install new insulation sleeves on repaired runs, sealed at both ends, to maintain thermal barrier integrity. Duct insulation work in Fresno typically adds $180-$340 to a repair job.

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After

Trusted Brands We Service in Fresno

CleanRun crews carry professional-grade equipment from trade-recognized brands: Rotobrush agitation systems for mechanical debris removal, Abatement Technologies HEPA-filtered negative-pressure extractors for containment, and Guardsman mastic sealants rated for high-humidity applications. We also stock Aprilaire media filters for homeowners upgrading filtration after duct repair. These aren’t proprietary tools - customers can look up specifications independently. We name them because Haven Standard Clause 2, Documented Methods, requires traceable equipment on every job.

Common Duct Repair & Sealing Problems We See in Fresno Homes

• Crushed flex runs from failed support hangers. In a Fresno subdivision off Teal Bend, our tech opened the air handler closet and found a 14-year-old flex run crushed flat against a truss where a hanger had failed, the liner shredded and trapping lint. We repaired the run with new flex and support hangers, sealed the boot collars with mastic, ran the Rotobrush agitation tools under negative pressure with HEPA filtration, then shot before-and-after photos of the customer’s own supply and return ducts. The static pressure dropped and the blower motor stopped short-cycling.
• Duct seal failures seeding mold in attic systems. Fresno’s dew points regularly exceed 70°F from May through October. When an AC system short-cycles or a duct seal fails, warm humid air contacts the cool duct surface and creates condensation conditions that seed mold colonies. Duct cleaning without sealing the source leak is temporary - the mold returns with the next humidity spike.
• Per-vent pricing that ignores crushed flex runs. The register looks clean, but the collapsed run behind it never gets camera-inspected or repaired. Airflow remains choked. Efficiency stays low. We inspect every run with a borescope before quoting, so the price reflects actual condition.
• Attic heat cycling degrading duct liner adhesive. Fresno attics routinely exceed 140°F in summer. The adhesive bonding flex duct liner to the wire helix degrades thermally over time. Liner separation creates turbulence, noise, and debris traps. We identify separated liner during camera inspection and replace affected sections.

Pricing for Duct Repair & Sealing in Fresno, TX

We Also Serve Cities Near Fresno

Our crews work throughout Fort Bend County and adjacent areas. We regularly perform Duct Repair & Sealing in Fresno and also serve Missouri City, Manvel, Stafford, and Sugar Land. The same written-price-first, photo-record-after standard applies in every city.

FAQs - Duct Repair & Sealing in Fresno