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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Before
AfterFast, Reliable Duct Sealing Across Selma
Selma Dryer Vent Cleaning and duct sealing typically runs $450 – $1,200 for a whole-home seal on mid-century tract homes, with most jobs completed in a single day. If your HVAC runs constantly from May through October but rooms still won’t hold temperature, the problem is often leaking ductwork in your attic, not your condenser. Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate and written price before any work starts.
We’ve worked in Selma long enough to know the difference between a west-side ranch off Floral Avenue built in 1968 and a newer stucco subdivision east of Highway 99. Our Duct Sealing in Selma crews dispatch from our San Antonio office and carry the equipment to handle both: mastic and mesh for baked-out galvanized seams, new flex runs where originals have collapsed, and duct insulation to protect against attics that hit 140°F in July. Selma’s semi-arid climate and relentless summer runtime means duct leaks aren’t a minor efficiency issue. They’re why your bedroom stays 8 degrees warmer than your thermostat setting at 3 p.m. in August.
Why Hollis Air Duct Cleaning Is Selma’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. Our 365-Day Done Right Promise covers every duct sealing job in writing: if the seal fails or the pressure reading doesn’t hold, we come back and make it right at no charge, including a free second visit. That’s not a slogan. It’s printed on every invoice.
Our technicians are background-checked, uniformed, and expected to operate under The Garrison Code: arrive inside the quoted window, price in writing before touching equipment, complete the job by the book, and leave the site clean. No exceptions. Phones are answered by a live person 24 hours a day, 7 days a week, so when you call about a crushed return duct after your August bill arrives, you talk to someone who can schedule you, not a callback queue that rings until Monday.
We don’t compete on teaser prices. We compete on discipline. The price we write down before work starts is the price you pay. No per-vent add-ons, no “discovered problems” once the van is in your driveway.
Duct Insulation in Selma
Duct Insulation in Selma is often the missing piece after sealing work is complete, especially on homes where galvanized trunks run through unconditioned attics that regularly reach 140°F. The seal stops the leak. The insulation stops the heat gain that makes your cooled air lukewarm before it reaches your vents. In Selma’s climate, where HVAC systems run six months straight, uninsulated ductwork in the attic is like pouring ice water into a sun-baked thermos.
When Attic Heat Overwhelms Sealed Ducts
Even perfectly sealed galvanized steel will transfer heat. We’ve measured supply air temperatures drop 12 – 15 degrees between the air handler and the register on uninsulated trunks in Selma attics during July afternoons. Wrapping the trunk with R-6 or R-8 duct insulation after sealing maintains the temperature you already paid to create.
Combining Sealing and Insulation in One Visit
Our crews carry both capabilities on every Selma job. If your camera inspection shows disconnected flex runs and baked-out seams, we’ll reconnect, seal with mastic and mesh, then insulate the accessible trunk lines before we leave. One written price covers the full scope. No return trip, no surprise add-on.
HVAC Duct Sealing in Selma
HVAC Duct Sealing in Selma addresses the specific failure modes we find in local homes: original galvanized trunk seams that have heat-cycled to powder, flex runs crushed by decades of blown-in insulation, and post-harvest dust residue that reopens marginal seals. The work involves pressure testing the system, locating leaks with smoke or camera inspection, then sealing with mastic and mesh (not duct tape) on rigid duct, or replacing damaged flex runs where needed.
Pressure Testing Before and After
We run a static pressure test at the start and end of every HVAC duct sealing job. If the numbers don’t improve, the job isn’t done. On a typical 1960s Selma ranch, we’ll see pre-seal readings 40 – 60% above spec. After reconnecting crushed returns and sealing galvanized seams, that drops into normal range. You get the before and after readings in writing.
What Sealing Fixes That Cleaning Cannot
Air duct cleaning removes contamination. It does not reconnect a flex run that’s pulled off the boot, and it does not restore a seal that has powdered away. In Selma’s older housing stock, we regularly find both problems during what the homeowner thought was a cleaning call. Our Duct Sealing team explains what the camera shows, writes the price for the actual fix, and completes the sealing work same visit if you approve.
Trusted Brands We Service in Selma
Hollis crews in Selma work with professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and we stock filtration and sealing products from Aprilaire and Guardsman for fast turnaround on local jobs. When a Selma homeowner needs a specific Aprilaire media cabinet sealed to a new trunk line, or Guardsman-coated duct board repaired after harvest dust infiltration, we don’t order parts from three states away. Our vans carry the common sizes and fittings for Selma’s predominant housing stock, which means less downtime between diagnosis and completion. The equipment is the same grade commercial HVAC contractors use on larger installations. We just apply it to residential duct systems with the same discipline.
Common Duct Sealing Problems We See in Selma Homes
- Galvanized trunk seams baked to dust. Selma’s mid-century tract homes on the west side were built with steel trunks that were never mastic-sealed at the joints. After 50+ years of valley heat cycling, the original sealant is powder. The seams leak conditioned air straight into 140°F attic space. This is a sealing problem long before it’s a cleaning problem.
- Crushed flex runs under blown-in insulation. Mid-century Selma homes often have flex duct buried under decades of added insulation. The weight compresses the flex, choking airflow. Homeowners blame the condenser. We find the real problem with a camera inspection and restore full diameter with new flex runs.
- Disconnected returns at the air handler. The vibration of decades of continuous summer runtime works metal connections loose. A return pulling attic air instead of conditioned house air destroys efficiency and pulls in harvest dust. We reconnect and seal with mastic and mesh.
- Post-harvest dust reopening marginal seals. During almond and grape harvest season, August through October, Selma’s air carries fine sticky residue that coats duct interior walls. This residue can clog filters within weeks and degrade seals that were already failing. Sealing after source removal prevents the cycle.
Pricing for Duct Sealing in Selma, TX
A typical duct sealing job in Selma runs $450 – $1,200 for a whole-home seal, depending on accessibility, the condition of existing ductwork, and whether insulation replacement is needed. Single-room repairs or minor seam sealing on accessible trunks start around $250. Full replacement of crushed flex runs, trunk sealing, and insulation wrapping on a larger mid-century home can reach the upper end.
What moves the price: attic accessibility (blown-in insulation adds labor), the number of disconnected or crushed runs we find, whether the air handler closet needs modification to access returns, and whether you add duct insulation after sealing. We inspect with a camera, write the full price before any work starts, and that number does not change at the door.
Every estimate is free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Selma
Hollis Air Duct Cleaning provides duct sealing throughout the region, including Selma and surrounding communities. We also dispatch crews to Houston, San Antonio, Dallas, and Fort Worth. Each location operates independently under The Garrison Standard with the same written pricing and 365-Day Done Right Promise.
Serving Selma, TX - 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
The cleaning removes dust and residue, but it exposes the underlying damage: disconnected boots, crushed flex, and galvanized seams that haven’t held pressure in decades. Once the contamination is gone, the structural failures are visible on camera. Sealing is the logical next step, and we can quote it during the same visit. Call (361) 326-5060 for an exact assessment.
Yes. From August through October, agricultural dust from surrounding orchards and vineyards carries fine, sticky particulate that infiltrates duct systems, coats interior walls, and can degrade marginal seals while clogging filters within weeks. Sealing after source removal prevents recontamination. We schedule additional Selma appointments in October specifically for post-harvest sealing.
Signs of leaks include rooms that won’t hold temperature despite a running system, uneven cooling across the house, dust blowing from registers right after cleaning, and utility bills that spike in July and August without explanation. We confirm with a static pressure test and camera inspection. The test takes 20 minutes and is included in our free estimate.
Yes. Newer homes with tighter envelopes and more sophisticated HVAC systems often have different failure points: poorly sealed duct board at the air handler, inadequate mastic on newer flex connections, or zoning damper leaks. Our equipment and methods adapt to both housing types. We’ll inspect and quote based on what your specific system needs.
We seal with professional-grade mastic and mesh systems, pressure-test with calibrated manometers, and carry Aprilaire and Guardsman filtration products for post-seal protection. Our rotary brush and negative-air equipment from Rotobrush and Nikro handles any source removal needed before sealing begins. Everything is commercial-grade, explained in plain terms on every job.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Selma and the San Antonio metro area.