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 Selma
Duct sealing in Selma typically runs $450 – $1,200 for a whole-home system, with most jobs completed in a single visit after a written quote. If your back bedrooms won’t cool, your filter loads up in two weeks, or your energy bill spikes through the summer, the problem is often gaps and disconnected runs in ductwork that was installed decades before modern standards existed.
We’re Hollis Air Duct Cleaning, and our crews work Selma regularly from our Fresno, Central Valley office. We know the difference between a 1960s tract home near Selma High and a newer stucco build off of East Front Street, and we know what fails in each. When you call (361) 326-5060, a live person answers, and we’ll get you a written price before any work starts.
Why Hollis Air Duct Cleaning Is Selma’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our 365-Day Done Right Promise is backed in writing on every job, not just spoken at the door. If the seal fails within a year, we come back and make it right at no charge, including a free second visit.
Our technicians are background-checked and uniformed, and they arrive inside the quoted window. We price in writing before touching anything, and we leave the site clean. That’s The Garrison Standard, and it’s how we operate in Selma, Fowler, Parlier, and every other community we serve.
We use professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, the same tools commercial crews use, and we explain what we’re doing in plain terms while we work. No jargon dumps, no pressure to add services you don’t need.
Duct Insulation in Selma
Duct Insulation in Selma addresses a specific problem: the thin, uninsulated or poorly insulated duct runs common in mid-century homes that lose conditioned air into hot attics before it ever reaches your registers. In a climate where summer temperatures regularly exceed 100°F and attics can hit 140°F, uninsulated ducts are essentially trying to push cool air through a heated tunnel. We wrap existing ductwork with formaldehyde-free fiberglass insulation rated for California Title 24 compliance, sealing the vapor barrier with mastic to prevent condensation and mold growth.
Most Selma duct insulation jobs fall between $600 and $1,800 depending on linear footage and attic accessibility. Homes with original galvanized trunks near Fowler Avenue or older flex runs in the Selma High area typically need the most coverage.
Attic Heat Gain in Older Homes
The 1950s – 1970s tract homes that dominate Selma’s core were built with minimal attic insulation by today’s standards, and many have never been upgraded. When your duct runs through that space without proper wrapping, you’re paying to cool air that warms back up before it hits your bedroom. We measure temperature drop at the registers and calculate what insulation will actually save you.
Condensation and Mold Risk
Selma’s semi-arid climate still produces enough humidity differential in summer months that cold ducts in hot attics sweat. That moisture attracts dust and can support mold growth on organic surfaces. Our insulation installs include sealing all seams with mastic first, so we’re not trapping moisture inside the wrap.
HVAC Duct Sealing in Selma
HVAC Duct Sealing in Selma is the core repair that fixes the leaks, gaps, and disconnected runs wasting your conditioned air and pulling dust from your attic into your living space. We pressurize the system, locate leaks with smoke pencils and thermal imaging, then seal joints with water-based mastic and fiberglass mesh, the method that outlasts tape by decades. For disconnected flex runs, we reconnect with mechanical fasteners and support straps, not just tape.
Typical whole-home HVAC duct sealing in Selma runs $450 – $1,200, with simpler single-zone repairs starting around $350. The price is written down before we start, and it doesn’t move at the door.
Factory Joint Failures in Galvanized Systems
The original galvanized trunk lines in Selma’s older homes were sealed at the factory with a bead of sealant that hardens and cracks after sixty years of thermal cycling. Every summer above 100°F expands that metal; every winter night below 40°F contracts it. The joints open slowly, and you don’t notice until your utility bill climbs or your back rooms stop cooling. We reseal these with mastic applied over mesh, rated for the temperature swings Selma throws at it.
Crushed and Disconnected Flex Runs
Early flex duct installed in Selma’s mid-century homes was often hung with inadequate support, sagging over time until it crushes at bends or pulls completely free at takeoffs. These failures hide above the air handler or in corners of the attic where homeowners never look. Our camera inspection finds them without tearing open walls, and we replace or reconnect with properly supported modern flex rated for the pressure your system generates.
Trusted Brands We Service in Selma
We stock parts and filtration products from Aprilaire, Abatement Technologies, and Guardsman, so most Selma jobs don’t wait on ordered components. Our equipment roster includes Rotobrush rotary brush systems for mechanical cleaning and Nikro negative-air machines for source removal under controlled pressure. When we seal your ducts, we’re using the same mastic and mesh products commercial HVAC contractors specify for hospitals and schools, not hardware-store tape that’ll fail in two seasons. For homeowners in newer east-side subdivisions with integrated filtration systems, we carry Aprilaire media filters and Guardsman UV components that match your existing housing.
Common Duct Sealing Problems We See in Selma Homes
- Original galvanized trunk joints separating from thermal cycling. The metal expands and contracts through 100°F+ summers, and the factory sealant cracks open. Conditioned air leaks into the attic while attic dust gets pulled into the return side, which is why your filter loads up so fast.
- Early flex duct crushing or disconnecting at takeoffs above the air handler. These runs were never designed for decades of continuous operation, and the supports fail. Back bedrooms stop cooling because the air never reaches them, and homeowners blame the AC unit when it’s actually a duct problem.
- Fine, sticky orchard dust coating duct walls and masking leaks. During almond and grape harvest from August through October, the dust that settles in Selma’s ducts is different from ordinary household dust. It’s oily, it clings, and it can make a partially sealed system seem fine until the coating breaks loose and clogs your filter in two weeks.
- Return duct gaps pulling unfiltered attic air. In homes near Highway 99 or in the older core around Selma High, vibration from traffic and decades of settling have opened gaps in return plenums. Your system recirculates attic air, dust, and insulation fibers through every room, and no filter can catch what enters downstream of it.
Pricing for Duct Sealing in Selma, CA
A typical whole-home duct sealing in Selma runs $450 – $1,200. Single-zone repairs or partial sealing start around $350, and complex jobs with multiple disconnected runs, insulation replacement, or access limitations in tight attics can reach $1,500. Duct insulation adds $600 – $1,800 depending on linear footage.
What moves the price: how much of your system is original galvanized versus modern flex, how many joints need resealing, whether we find crushed or disconnected runs requiring reconnection, and attic accessibility. We don’t price per vent, and we don’t bait you with a low teaser that balloons once we’re inside. One flat price per system, agreed in writing before work starts.
Every sealing job includes a post-repair pressure test so you know the system holds. We also provide before-and-after photos of your own ducts, not stock images. Call (361) 326-5060 for a free estimate, and we’ll give you a written quote you can compare without pressure.
We Also Serve Cities Near Selma
Our crews cover Selma and the surrounding San Joaquin Valley communities, including Fowler, Parlier, Kingsburg, and Reedley. Whether you’re in a mid-century home near downtown Selma or a newer build out toward Fowler, we bring the same equipment and the same written guarantee. Duct Sealing work is scheduled, not emergency dispatch, and we coordinate timing from our Fresno, Central Valley office to keep arrival windows reliable.
Serving Selma, CA - Our Local Coverage Area
We’re based in the Selma 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 Selma
Selma’s 1950s – 1970s tract homes were built with original galvanized or early flex duct that was never meant to handle modern MERV filtration, so the sealing failures we find here are usually at factory joints and original takeoffs, not at the modern components neighbors in newer east-side stucco subdivisions call us about. The metal has expanded and contracted through sixty years of 100°F summers, and the sealant has simply failed. Call (361) 326-5060 and we’ll inspect your system to show you exactly where the leaks are.
Yes, the fine, sticky dust from surrounding orchards and vineyards coats duct walls and clogs filters within weeks during August through October, which is why so many Selma sealing jobs get scheduled right after harvest rather than in spring. That residue is different from ordinary household dust, it’s oily and adheres to duct surfaces, and it can mask sealing failures until a camera inspection under negative pressure reveals the gaps. If your filter loads up every two weeks in fall, you likely have leaks pulling that dust in continuously.
We pressurize the system and use a camera on a flexible rod to inspect every run from the air handler to the register, looking for crushed flex, gaps at takeoffs, and disconnected sections hidden above the unit. Smoke pencils and thermal imaging confirm where conditioned air is escaping into the attic. Last September, right after almond harvest, our crew was at a mid-century tract home near the Selma High area where the homeowner’s filter was loading up within two weeks and the back rooms never cooled. Camera inspection showed a crushed, disconnected original flex run off the main trunk and open galvanized joints at the air handler pulling dust straight from the attic; we used negative pressure with HEPA filtration for source removal, reconnected and sealed the damaged run, and sealed the remaining joints with mastic and mesh. The blower motor stopped short-cycling, registers in the back bedrooms finally moved air, and the filter has held up through the rest of the season.
Sealing stops new dust from entering, but if your ducts already carry years of accumulated debris, especially the sticky orchard residue from recent harvests, you’ll need source removal cleaning first or you’ll be recirculating that load indefinitely. We typically recommend cleaning before sealing on Selma homes that haven’t been serviced in several years, and we can quote both together with one flat price per system. Call (361) 326-5060 and we’ll inspect to tell you which approach makes sense for your specific system.
Once your ducts are properly sealed, a MERV 11 or 13 filter will perform as designed, capturing fine particulate from agricultural operations and Highway 99 traffic without overloading your blower motor. In unsealed systems, high-MERV filters just create more pressure differential that pulls dust through gaps faster. After sealing, we measure static pressure and recommend the highest rating your system can handle efficiently, typically MERV 11 for older Selma units and MERV 13 for newer east-side systems with variable-speed blowers.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Selma and the Central Valley since 2004.