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 $800 – $2,400 for a whole-home system, depending on how much of the original ductwork needs attention and whether we’re repairing disconnected runs or resealing the entire distribution network. Most Fresno homeowners call us after noticing dust plumes at the vents, rooms that won’t cool evenly during the 100°F-plus summer stretch, or utility bills that climb every May through October without explanation. Our Duct Sealing in Fresno crews are dispatched from our Central Valley office, and we serve neighborhoods from the older ranch homes off Tulare Avenue to the newer stucco subdivisions north of Herndon Avenue. Call (361) 326-5060 for a free estimate, and we’ll show up inside the quoted window with a written price before any work starts.
Why Hollis Air Duct Cleaning Is Fresno’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and our Fresno operation runs on The Garrison Standard: arrive inside the window, price in writing, complete the job by the book, and leave the site clean. That standard matters here because Fresno’s housing stock punishes shortcuts. Our technicians are background-checked and uniformed, and our phones are answered by a live person 24 hours a day, 7 days a week, no voicemail loops.
Our 365-Day Done Right Promise covers every duct sealing job in writing. If the seal fails or a disconnected run separates again within a year, we return and make it right at no charge, including a free second visit. No negotiation, no runaround. We’ve found that Fresno homeowners, especially those in the 1950s – 60s ranch tracts near Roosevelt High School or the Fig Garden loop, have been burned by crews who sealed with hardware-store tape and disappeared. We don’t do that. The price is written down before we touch anything, and it does not move at the door.
HVAC Duct Sealing in Fresno
HVAC Duct Sealing in Fresno is often the real fix behind symptoms that look like dirty ducts or an undersized air conditioner. The job involves locating leaks in the supply and return network, reconnecting separated flex runs, sealing plenum transitions with mastic and mesh tape, and pressure-testing the system to confirm the repair. In Fresno’s market, a targeted seal on 3 – 5 problem runs typically costs $800 – $1,400, while a whole-home reseal including the air handler plenum runs $1,800 – $2,400.
Most of our calls come from homeowners in the May – October window, when systems run 12 – 16 hours daily and every leak dumps $20 – $40 of conditioned air into a 150°F attic. We use professional-grade equipment from Nikro and Abatement Technologies to pressurize the system and locate leaks that visual inspection misses.
When Sealing Beats Replacement
Original metal trunk lines in west Fresno homes are often sound structurally; they’ve just lost their seals. A full duct replacement runs $4,500 – $8,000 in this market. If the trunk is intact and the flex runs are reconnectable, sealing restores performance at roughly one-third the cost. We tell you straight which path makes sense after the camera inspection.
Mastic vs. Tape in Fresno Heat
Standard duct tape fails in 140°F attic heat. We seal with water-based mastic, reinforced with fiberglass mesh tape at joints and plenum transitions. The mastic remains flexible through thermal cycling and carries a 10-year rated life in attic conditions. It’s slower to apply than tape. It costs more in material. It doesn’t fail in August.
Duct Repair in Fresno
Duct Repair in Fresno addresses the mechanical failures that sealing alone won’t fix: crushed flex runs from contractors stepping through the attic, disconnected branches that have separated entirely from the trunk line, and rusted metal plenums in homes near industrial zones south of downtown. Repair costs in Fresno range from $400 for a single reconnected run to $1,200 – $1,800 for multiple crushed sections or a partial trunk rebuild.
We see the worst damage in post-WWII ranch homes with original flexible ductwork, especially in the older tracts near Highway 99 and the neighborhoods east of Blackstone Avenue. Those runs were sized for smaller equipment and have been kicked, baked, and sagging for 60-plus years.
Camera Inspection Before Cutting
We run a borescope through every accessible run before quoting repair work. You see what we see: the disconnected branch, the collapsed liner, the spot where a rat chewed through the outer jacket. No guesswork means no surprises on the invoice. The inspection is included in every service call.
Reconnection vs. Replacement
A disconnected flex run with intact liner gets reconnected and sealed. A run with cracked, chalky liner or collapsed insulation gets replaced with new R-6 or R-8 flex, matched to the existing diameter. We stock common sizes on our Fresno vans, so most repairs finish same visit.
Trusted Brands We Service in Fresno
Our Fresno vans carry sealing and filtration products from Honeywell, Aprilaire, and Abatement Technologies, plus negative-air equipment from Nikro for pre-seal cleaning. We don’t use hardware-store tape or consumer-grade mastic. The Honeywell and Aprilaire filtration components we install are the same units specified for commercial buildings in the San Joaquin Valley, rated for the PM2.5 load this region carries. Because we stock parts locally, most Fresno homeowners don’t wait on a second trip. If your system needs a specific plenum adapter or transition fitting, we likely have it on the van. If we don’t, our Central Valley supplier network usually turns it around in 24 hours.
Common Duct Sealing Problems We See in Fresno Homes
- Cooked flex liner in 1950s – 60s ranch homes. The foil-faced flexible duct runs in central Fresno attics hit 140 – 160°F for six months straight. The adhesive backing turns chalky and peels, opening longitudinal leaks along the run rather than at the joints. We see this constantly in the older tracts off Tulare Avenue and McKinley Avenue.
- Brittle original duct tape on metal trunk lines. West Fresno homes with original galvanized trunk lines were sealed with cloth-backed duct tape that hardens and falls off after 30 – 40 years. Sealing over it without first removing the residue and re-mastic-ing the seam leaks again within a season.
- Smoke-residue infiltration through failed seals. Six months of near-continuous blower operation pulls San Joaquin Valley particulate and wildfire-smoke residue through every gap. A bad seal doesn’t just lose conditioned air; it deposits fine particulate inside the run where rotary brushing can’t fully reach it.
- Unsealed plenum-to-air-handler transitions. The sheet-metal box connecting your furnace or air handler to the duct trunk is often the leakiest joint in the system. Unsealed, it lets attic dust and fiberglass particles bypass any HEPA filtration and flow straight to your registers.
Pricing for Duct Sealing in Fresno, CA
A typical duct sealing job in Fresno runs $800 – $2,400, depending on system size and condition. Here’s how that breaks down:
| Service Level | Typical Range |
|---|---|
| Targeted seal: 3 – 5 problem runs, plenum touch-up | $800 – $1,400 |
| Whole-home reseal: all accessible supply/return joints, mastic application, pressure test | $1,800 – $2,400 |
| Duct repair: reconnection of 1 – 2 separated runs | $400 – $700 |
| Duct repair: multiple crushed runs or partial trunk rebuild | $1,200 – $1,800 |
What moves the number: accessibility (crawl space vs. walk-in attic), extent of damaged flex liner requiring replacement rather than reseal, and whether the air handler plenum needs rebuilding. We give one flat price per system, agreed in writing before work starts. No per-vent pricing, no add-ons at the door. Call (361) 326-5060 for an exact quote, estimates are free.
We Also Serve Cities Near Fresno
Our Duct Sealing crews regularly work in Clovis, Madera, Sanger, and Fowler, handling the same post-WWII tract stock and stucco subdivision builds that define the broader Central Valley housing market. Scheduling and dispatch are coordinated from our Fresno office, so response times to these outlying cities stay tight.
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 About Duct Sealing in Fresno
Dust plumes after cleaning usually mean leaks downstream of the filter. In Fresno’s 140 – 160°F attics, cooked mastic and separated flex runs pull attic dust directly into the supply air. Cleaning removes what’s already inside; sealing stops new dust from entering. Call (361) 326-5060 and we’ll pressurize the system to find the leak points.
Yes, because the original flexible ductwork has endured decades of thermal cycling that newer R-6 or R-8 flex hasn’t. The 1958 ranch house off Tulare Avenue we mentioned earlier is typical: three disconnected runs and a crushed trunk branch, all hidden above the insulation. Newer subdivisions near Clovis Avenue usually have intact ductwork with simpler joint leaks. The older homes take longer but the improvement is more dramatic.
Attic temperatures in Fresno’s stucco tract homes routinely reach 140 – 160°F from June through September, and on 105°F-plus days can spike higher. That heat bakes duct liner adhesive, accelerates metal fatigue at plenum seams, and expands the pressure differential that forces leaks open. No coastal California market sees this combination of sustained attic heat plus six-month cooling runs.
Sealing reduces smoke infiltration by closing the pathways where unfiltered attic air enters the duct network. It doesn’t make the system smoke-proof, but in a region with chronic PM2.5 nonattainment and seasonal wildfire impact, every sealed joint is one less entry point for particulate. For maximum protection, we pair sealing with Aprilaire or Honeywell media filters rated MERV 13 or higher.
We arrive inside the quoted window, inspect accessible ductwork with a borescope, pressurize the system to locate leaks, reconnect separated runs, seal all joints and plenum transitions with mastic and mesh tape, and retest static pressure to confirm the repair. You get before-and-after photos of your own ducts, a written price that never changed, and a 365-Day Done Right Promise in writing. Call (361) 326-5060 to schedule.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Fresno and the Central Valley.