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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AfterFast, Reliable Duct Sealing Across Fresno
Duct sealing in Fresno typically runs $450 – $1,200 for a whole-house job, depending on how much of the system needs mastic, tape, or collar repair. Most Fresno homes we work on need sealing, not just cleaning, because decades of 140°F attic heat have cooked the original flexible ductwork until it cracks and separates. If you’re seeing dust plumes at your registers or rooms that never cool evenly, the ducts are likely leaking conditioned air into your attic. Call Hollis Air Duct Cleaning at (361) 326-5060 for a free inspection and written estimate before any work starts.
We’ve been driving to Fresno from our Houston dispatch office since 2004, and we know the local housing stock: the 1950s ranch houses off West Clinton Avenue, the stucco subdivisions north toward Herndon Avenue, and the 1980s tract homes near Fresno Boulevard. Our crews carry Rotobrush rotary systems and Nikro negative-air machines in every van, and we background-check and uniform every technician who walks through your door. Scheduling is coordinated from Houston, but the crew that shows up knows Fresno attics.
Why Hollis Air Duct Cleaning Is Fresno’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning operates under The Garrison Standard, which means we arrive inside the quoted window, price the job in writing before touching anything, and leave the site clean. Our Duct Sealing in Fresno work is covered by the 365-Day Done Right Promise: if the seal fails or the leak returns within a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.
Our technicians are background-checked, uniformed, and trained to explain what they find in plain terms. We don’t send a salesperson with a clipboard; the tech who inspects your ducts is the tech who seals them. Calls are answered by a live person 24 hours a day, 7 days a week, not a voicemail loop. We’ve built our reputation in Fresno on showing up when we said we would and charging what we quoted.
We stock parts and materials for the brands Fresno homeowners actually have: Honeywell filtration systems, Aprilaire media cleaners, and Abatement Technologies HEPA equipment. That means faster turnaround and no waiting on shipped parts while your attic bakes another week.
Duct Insulation in Fresno
Duct Insulation in Fresno is often the companion repair to sealing, because attic runs that have cooked at 140-160°F for decades have usually lost their R-value or had the insulation jacket separate from the duct itself. The job involves wrapping or replacing insulation on supply and return runs, sealing the vapor barrier, and re-supporting the duct so it doesn’t sag back onto hot attic decking. A typical Fresno home needs partial re-insulation on 30-50% of the attic runs, with whole-house jobs running $600 – $1,800 depending on accessibility and how much original material has degraded.
When Insulation Has Cooked Through
In central Fresno’s 1950s-60s ranch houses, we regularly pull back insulation jackets to find the inner liner has shrunk away from the collar, leaving a bare gap blowing 55°F air into a 150°F attic. Re-insulating without re-sealing first is a waste; we seal the collar and plenum seams with mastic, then wrap with fresh R-6 or R-8 insulation and secure it with proper strapping.
Crushed Runs in Stucco Tract Homes
North and northeast Fresno subdivisions from the 1980s-2000s often have flexible duct crushed against framing members during original construction. The duct still “works,” but the restricted airflow causes the system to overwork and the insulation to compress. We re-support the run, restore the full diameter, and re-insulate so the conditioned air actually reaches the register.
HVAC Duct Sealing in Fresno
HVAC Duct Sealing in Fresno is the core repair that makes cleaning worth doing, because in this market the ducts are usually leaking before they’re dirty. The job involves pressurizing the system to locate leaks, re-sealing collar connections with mastic and foil tape rated for high heat, coating plenum seams, and replacing failed flex duct sections where the inner liner has baked through. A typical whole-house seal in Fresno runs $450 – $1,200; partial repairs on two to three problem runs start around $350.
Camera Inspection Before Sealing
We run a camera through every accessible run before we quote. In a 1957 ranch house off West Clinton Avenue in central Fresno, our tech found the supply trunk had separated at two collars – the original flexible duct had baked through after decades of 150°F summer attic cycles, and the return was pulling attic dust straight into the air handler. After a negative-pressure source removal clean with HEPA filtration and agitation tools, we re-sealed both collars, mastic-coated the plenum seams, and re-insulated the run. The visible dust plume at the bedroom registers stopped on the next cooling cycle.
Mastic vs. Foil Tape in Fresno Heat
Fresno’s attic temperatures destroy standard foil tape in three to five years. We use UL-181B-FX rated tape as a mechanical backup, but the primary seal is always water-based duct mastic, which remains flexible at 200°F and bonds to the duct liner even when valley PM2.5 residue has coated the surface. It’s slower to apply than tape. It lasts.
Trusted Brands We Service in Fresno
We carry professional-grade equipment and parts from Nikro, Honeywell, Aprilaire, and Abatement Technologies on every Fresno job. Nikro negative-air machines power our source-removal cleans; Honeywell and Aprilaire filtration products replace what we remove with something that actually catches valley particulate. For Fresno’s chronic PM2.5 nonattainment zone, we spec Abatement Technologies HEPA filtration during the clean itself, so we’re not just stirring up what the attic baked into your ducts. We stock these parts locally, not on order from a warehouse three states away. That means your job gets finished in one visit, and if we find a failed collar or crushed run during inspection, we have the materials to fix it that day.
Common Duct Sealing Problems We See in Fresno Homes
- Baked-through flexible duct in post-WWII ranches. The 1950s-60s homes in central and west Fresno still have original non-metallic duct in attics that hit 140-160°F every summer. The inner liner shrinks, cracks, and separates from the collar. You can’t see it from the register. We find it on camera.
- Wildfire-smoke residue hiding cracked seams. Fresno’s May-through-October cooling run pulls valley PM2.5 and wildfire particulate through the return side, where it coats mastic and tape edges. The cracks are invisible until we put the system under negative pressure during a clean and watch the smoke pencil dance at the leak.
- Undersized or crushed runs in stucco tract homes. North and northeast Fresno subdivisions from the 1980s-2000s often have flexible duct jammed against framing or pinched at bends. Even a perfect clean can’t restore airflow through a duct that’s physically restricted. We re-seal and re-support.
- Return leaks pulling attic air straight into the handler. In Fresno’s extreme heat, return plenum seams crack and suck 150°F attic air into the system. The air handler works harder, the cooling bill climbs, and the filter loads with attic dust instead of house air. Sealing the plenum is usually a half-day job.
Pricing for Duct Sealing in Fresno, TX
A typical whole-house duct sealing job in Fresno runs $450 – $1,200. Partial repairs on two to three problem runs start around $350. Duct insulation work, when needed alongside sealing, adds $600 – $1,800 depending on how many runs need re-wrapping and whether we need to replace degraded flexible duct sections entirely.
What moves the price: accessibility (crawl space vs. walkable attic), how much original 1950s-60s duct needs replacement versus sealing, and whether the plenum itself requires mastic coating. We give one flat price per system, agreed in writing before any work starts. No per-vent pricing, no add-ons at the door, no bait-and-switch. Every Fresno job includes before-and-after photos of your own ducts, so you see what was leaking and what we sealed. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Fresno
Our crews regularly work in Fresno and the surrounding communities: Missouri City, Manvel, Stafford, and Sugar Land. Scheduling is coordinated from our Houston office, and we route to minimize drive time so we arrive inside the quoted window.
Serving Fresno, TX - 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 About Duct Sealing in Fresno
Fresno attic duct runs hit 140-160°F in summer, while Bay Area attics rarely exceed 90°F. That heat cooks flexible duct liner and mastic until it cracks and separates. Your brother’s ducts age in mild conditions; yours bake for six months straight every year. Call (361) 326-5060 for an inspection and written estimate.
We seal ducts on every age of home, but 1950s ranch houses in central Fresno are actually our most common call. The original flexible duct has usually baked through at the collars, and the plenum seams need mastic coating. We camera-inspect first, quote in writing, and do the work by The Garrison Code. Call (361) 326-5060 to schedule.
We pressurize the system and use a smoke pencil or theatrical fog at every register and attic access. If the smoke gets sucked in or blown out, we have a leak. We also run a camera through accessible runs to show you collar separations and crushed sections before we quote any work. The inspection itself is free.
Cleaning removes what’s already in the ducts; sealing stops your return leaks from pulling fresh valley PM2.5 and wildfire smoke back in. In Fresno’s chronic nonattainment zone, both matter. We’ve seen sealed systems hold clean duct conditions for two to three years, while unsealed systems re-contaminate in six months. Call (361) 326-5060 to discuss whether your home needs both.
We recommend MERV 11 to 13 pleated filters for most Fresno homes, changed every 60-90 days during the May-through-October cooling run. After sealing, the system isn’t pulling attic dust through return leaks, so the filter actually does its job instead of loading with debris. For homes with allergy-sensitive residents, we spec Aprilaire or Honeywell media air cleaners that hold more particulate between changes. Call (361) 326-5060 and we’ll match the setup to your system.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Fresno since 2004 as part of the Garrison Partners family.