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 Denton
Duct sealing in Denton typically runs $450 – $1,200 for a whole-home system, and most jobs are scheduled within a few days of your call. We’re the Duct Sealing crew that serves Denton from our Dallas-Fort Worth dispatch office, with technicians who know the difference between a 1960s ranch near UNT and a retrofit loft above the historic square. Call us at (361) 326-5060 for a free estimate.
Denton’s housing stock is unlike newer metro areas. We’ve worked on original galvanized ductwork in post-war rentals off Bonnie Brae, crushed flex runs in attic conversions near Texas Woman’s University, and sealed retrofitted systems in century-old buildings around the downtown square. That variety matters because sealing methods that work on one Denton home can fail on another. Our techs carry camera inspection gear, negative-air HEPA machines from Nikro, and mastic rated for the humidity this region throws at ductwork.
Why Hollis Air Duct Cleaning Is Denton’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and our Denton reputation was built on showing up inside the window, pricing in writing, and leaving the site clean. The Garrison Standard applies to every job here, whether it’s a single-family home in Southridge or a rental turnover near the UNT campus.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. We don’t send day-laborers or subcontractors. The same tech who quotes the job seals the ducts.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues. If you’re a property manager with a move-in deadline on a Denton rental, that matters.
Every repair is covered by our 365-Day Done Right Promise in writing. If the seal fails within a year, we return and make it right at no charge, including a free second visit. We don’t negotiate this. It’s on the invoice.
Duct Sealing Services in Denton
Duct Sealing Services in Denton address the conditioned air leaking from joints, seams, and disconnected runs in your HVAC system before it ever reaches your rooms. In a city where summers stay above 90 degrees for weeks and humidity clings through September, every cubic foot of cooled air that escapes into your attic is money you’re paying to condition nobody’s living space. A typical whole-home duct sealing job in Denton runs $450 – $1,200 depending on system accessibility, the extent of disconnection, and whether source removal is needed before mastic application.
Camera Inspection and Leak Mapping
We run a borescope through the ductwork before we quote sealing. In Denton’s older neighborhoods, this often reveals crushed runs, open joints behind original registers, or galvanized rust that would trap moisture if sealed over blindly. You see the footage. We mark every leak on a diagram. Then we price it in writing.
Mastic Sealing with Reinforced Mesh
We seal joints with water-based duct mastic and fiberglass mesh, not foil tape that peels in attic heat. For rusted galvanized connections in post-war Denton homes, we remove the corrosion mat first with HEPA-negative-air extraction, then seal. The bond lasts. We’ve tested it through Denton summers.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Duct Insulation in Denton
Duct Insulation in Denton protects sealed ductwork from the attic heat that can raise supply air temperature by 10 – 15 degrees before it reaches your vents. In a climate where attics hit 140 degrees in July, uninsulated or degraded duct wrap is a major efficiency loss. Most Denton homeowners need insulation assessment when their ducts are already accessible for sealing, or when they notice rooms that cool slowly despite good airflow. Adding or replacing duct insulation typically runs $300 – $800 in Denton, often combined with sealing work for a single flat price per system agreed before we start.
R-Value Assessment and Replacement
Original duct insulation in 1950s – 1970s Denton homes was often R-4 or R-6 fiberglass wrap that has compressed, torn, or absorbed moisture. We measure what remains and quote R-8 replacement where the attic environment demands it. No per-foot pricing games. One flat price for the system.
Vapor Barrier Repair
Denton’s spring storms and humid summers push moisture into attics. When a duct’s outer vapor barrier is compromised, condensation forms on the metal, rust accelerates, and mold risk rises. We repair or replace barrier integrity as part of insulation work, especially in homes near Little Elm Creek where humidity lingers.
Trusted Brands We Service in Denton
Our equipment roster includes Rotobrush rotary brush systems for agitation, Nikro negative-air machines for HEPA containment, and filtration and sealing products from Abatement Technologies and Guardsman. We stock parts and materials locally for Denton jobs, so we’re not waiting on shipping while your rental sits vacant or your AC fights leaking ducts through another August. When a property manager near the UNT campus calls with a turnover deadline, that local inventory means we can inspect, quote, and schedule sealing without delays that cost them a lease.
Common Duct Sealing Problems We See in Denton Homes
- Original galvanized rust in 1950s rentals near TWU. We regularly find duct runs that have never been sealed, coated in a bonded mat of galvanized corrosion, attic fiberglass, and decades of debris. Sealing over this traps moisture. We remove it with negative-pressure HEPA extraction first.
- Disconnected returns buried above attic insulation. In post-war Denton homes with loose-fill insulation, return ducts can separate completely while appearing intact from below. The blower pulls attic air, insulation fibers, and dust straight into the system. Camera inspection finds what visual checks miss.
- Crushed flex runs in cramped downtown square lofts. Retrofitted HVAC in century-old buildings above Denton’s historic square often has irregular duct paths where standard sealing methods can’t reach. We use specialized tools and mastic application techniques for tight spaces.
- Failed tape seals from previous DIY or low-bid work. Foil tape and cheap mastic degrade in Denton’s attic heat within a season. We remove the old material and seal with products rated for continuous high-temperature exposure.
Pricing for Duct Sealing in Denton, TX
Whole-home duct sealing in Denton typically costs $450 – $1,200. Duct insulation runs $300 – $800. Combined sealing and insulation work is usually priced as one flat rate per system, agreed in writing before we touch anything.
What moves the number: system accessibility (crawl space vs. walk-in attic), extent of disconnection or crushing, whether source removal is needed before sealing, and if we’re working around a property manager’s move-in deadline. We don’t quote per-vent or per-foot. That’s how the teaser-price game works, and we don’t play it.
Every estimate is free. We inspect with a camera, show you what we found, and write the price down. It doesn’t move at the door. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Denton
Our Duct Sealing in Denton crews also work in Krum, Argyle, Sanger, and Aubrey. Same equipment, same written pricing, same 365-Day Done Right Promise. Dispatch and scheduling are coordinated from our Dallas-Fort Worth office, with local crews serving each community.
Serving Denton, TX - Our Local Coverage Area
We’re based in the Denton 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 Denton
The original 1950s galvanized ductwork in these rentals was never sealed at the joints, and decades of rust, attic fiberglass, and tenant-era debris have bonded into a mat that standard brushing can’t fully remove. Cleaning alone leaves leaks that continue pulling attic air into the system. We remove the contamination with negative-pressure HEPA extraction, then seal with mastic so the ducts hold pressure. Call (361) 326-5060 for a camera inspection and written quote.
Yes, though these retrofitted systems require specialized access tools and flexible mastic application methods that standard crews may not carry. The irregular duct paths in century-old buildings demand camera-guided work and patience. We’ve sealed lofts on the square where the original plaster walls left no straight runs. Call (361) 326-5060 to discuss your specific building.
High humidity accelerates rust on exposed galvanized metal and can degrade tape-based seals within a single season. We use water-based mastic with reinforced mesh, rated for continuous exposure to moist attic conditions, and we always remove corrosion sources before sealing rather than trapping moisture behind a new seal. Call (361) 326-5060 to schedule before peak summer demand.
Yes. Our process aligns with NADCA guidelines for source removal, containment, and post-clean verification. For rental turnovers near UNT, this means documented camera footage, HEPA-contained agitation, and static pressure testing after sealing so property managers have proof of work completed to standard. Call (361) 326-5060 for documentation requirements.
Typically: open joints behind original registers, crushed runs from attic storage activity, disconnected returns hidden above insulation, and rust patterns that indicate where moisture has been entering the system. The footage lets us quote accurately and lets you see why sealing is necessary. Call (361) 326-5060 to book a free inspection.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Denton and the Dallas-Fort Worth area since 2004.