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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Allen
Most Allen homes were built between the 1990s and 2010s with tight, energy-efficient envelopes and flexible duct runs. When the builder’s handover leaves drywall dust and construction debris behind, that tight construction traps it inside and recirculates it through every room. Duct sealing in Allen typically runs $400 – $900 for a whole-home seal, and we always clean the system first so we’re not sealing debris in permanently. Call (361) 326-5060 for a free estimate with a written price before any work starts.
We dispatch to Allen from our Dallas-Fort Worth office, and our crews know the neighborhoods from Twin Creeks to Waterford Parks. We’ve worked in enough Allen attics to recognize the patterns: upstairs air handlers squeezed into tight spaces, flex duct that sags where the builder’s crew didn’t support it properly, and construction dust still sitting in the returns six months after closing. That local familiarity means we diagnose faster and quote accurately the first time.
Our Duct Sealing team follows The Garrison Standard on every job: arrive inside the quoted window, price in writing, complete the work by the book, and leave the site clean. No exceptions.
Why Hollis Air Duct Cleaning Is Allen’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family. That track record predates most competitors you’ll find in Allen, and it means we’ve seen how this market’s housing stock behaves over time. We know which master-planned communities used which flex-duct configurations, and we know where the builders cut corners.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. They carry professional-grade equipment from Rotobrush and Abatement Technologies, and they explain what they’re doing in plain terms, not jargon.
Every job gets a written price before work begins, and every repair is covered by our 365-Day Done Right Promise. If the work fails within a year, we come back and make it right at no charge, including a free second visit. That’s not a verbal assurance; it’s written on every invoice.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule.
Duct Sealing Services in Allen
Duct Sealing Services in Allen address the leaks, gaps, and disconnected joints that let conditioned air escape into your attic, crawl space, or wall cavities. In a typical Allen home built in the 1990s – 2010s, we find that 20 – 30% of heated or cooled air never reaches the living space due to these leaks. Duct sealing in Allen typically costs $400 – $900 for a full system, depending on accessibility and the extent of the damage. We use mastic sealant and metal-backed tape rated for HVAC applications, not the hardware-store duct tape that fails within a year.
Leak Detection and Pressure Testing
We start every sealing job with a pressure test to measure exactly how much air your system is losing. In Allen’s tight-construction homes, even small leaks create outsized efficiency losses because there’s nowhere else for the air to go. Our techs use a calibrated fan and digital manometer to quantify the problem before we quote the fix.
Mastic Sealing of Joints and Connections
We brush on UL-181 rated mastic at every joint, boot, and connection point. It cures to a flexible, permanent seal that moves with the ductwork as it expands and contracts through Allen’s hot summers and mild winters. This is the standard the Department of Energy recommends, and it’s the standard we apply on every job.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Duct Insulation in Allen
Duct Insulation in Allen prevents the temperature loss that happens when conditioned air travels through unconditioned spaces. In Allen’s two-story homes, the upstairs air handler is often tucked into a tight attic where summer temperatures exceed 140°F. Uninsulated or poorly insulated flex duct in that environment bleeds cooling capacity before the air ever reaches your bedroom. Duct insulation in Allen typically runs $600 – $1,400 for a full system wrap, depending on linear footage and R-value needed.
Attic Duct Wrap and Blanket Insulation
We install fiberglass duct wrap or foil-faced bubble insulation around existing ductwork, sealed at every seam to prevent moisture infiltration. In Allen’s humid subtropical climate, vapor barriers matter. Condensation on cold duct surfaces in a hot attic creates the exact conditions for microbial growth.
R-Value Assessment and Upgrade
Most Allen homes were built with R-4 or R-6 duct insulation. Current code in this region calls for R-8 in unconditioned spaces. We assess what you have, explain what code requires, and quote the upgrade if it makes sense for your system and your budget. No pressure, just numbers.
Trusted Brands We Service in Allen
We stock parts and materials from Aprilaire, Guardsman, and Abatement Technologies for Allen customers, which means faster turnaround and no waiting on shipped components. Aprilaire’s ventilation and filtration products integrate cleanly with the zoned systems common in Allen’s master-planned communities. Guardsman supplies the mastic and metal-backed tapes we trust for permanent seals in hot attics. Abatement Technologies provides the HEPA-filtered negative-air machines we use to protect your home’s air quality while we work. When your system needs a specific component, we don’t guess; we source the right part and install it to manufacturer spec.
Common Duct Sealing Problems We See in Allen Homes
- Construction debris left from builder handover. Drywall dust and sawdust in the supply and return ducts gets trapped by Allen’s tight building envelopes and recirculates for months. We see this in newer homes across Twin Creeks, Waterford Parks, and similar communities where the builder never source-removed debris before closing.
- Flex-duct sag and kink in upstairs runs. Allen’s two-story homes often have air handlers in tight attics with long flex-duct runs to second-floor registers. Gravity and poor support create low spots where dust collects and airflow restricts. This pattern is common here but rare in older, single-story Dallas neighborhoods.
- Sealing over dirty ducts without cleaning first. Some competitors will seal leaks without removing construction dust or accumulated debris. That traps contaminants permanently inside your system. We clean before we seal, every time.
- Disconnected boots at drywall interfaces. The connection between metal duct boots and flex duct can separate during settling, especially in Allen’s newer homes where the ground is still compacting. We find these leaks with pressure testing and repair them with mechanical fasteners and mastic, not tape alone.
Pricing for Duct Sealing in Allen, TX
Duct sealing in Allen typically costs $400 – $900 for a whole-home seal, and duct insulation runs $600 – $1,400 depending on linear footage and accessibility. What moves the number: how much of your ductwork is in conditioned versus unconditioned space, whether we need to remove old failed tape or sealant first, and whether the attic air handler requires protective decking to access safely.
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. You’ll see the total cost on paper before we pick up a tool. Estimates are free, and we bring a camera so you can see what we’re seeing.
Call (361) 326-5060 for an exact quote on your Allen home.
We Also Serve Cities Near Allen
Our crews work throughout Collin County and beyond, including Allen, Plano, McKinney, Wylie, and Sachse. Same standards, same written pricing, same 365-Day Done Right Promise at every stop.
Serving Allen, TX - Our Local Coverage Area
We’re based in the Allen 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 Allen
Builder handovers in Allen frequently leave drywall dust, sawdust, and construction debris in the supply and return ducts. Because your home’s tight, energy-efficient envelope doesn’t let that dust escape, it recirculates through your HVAC system for weeks or months. We recommend a camera inspection before your one-year builder warranty expires. Call (361) 326-5060 to schedule – estimates are free.
The long flex-duct runs from attic air handlers to second-floor registers sag and kink over time, creating hidden low spots where dust and condensation collect. We test pressure and airflow at each register, support sagging runs with proper hangers, and seal every joint with mastic rated for the temperature swings in an Allen attic. Call (361) 326-5060 for a full system evaluation.
Sealing alone won’t stop pollen, but it prevents your system from pulling unfiltered attic air through leaks and mixing it with conditioned air. In Allen’s heavy pollen seasons, that matters: a sealed system with a properly rated filter handles the load your equipment was designed for, instead of fighting additional infiltration. For full allergen control, pair sealing with duct cleaning and the right filtration media. Call (361) 326-5060 to discuss options.
The builder should have source-removed all construction debris from ducts, verified proper support for flex-duct runs, pressure-tested the system for leaks, and sealed every joint with mastic rather than tape alone. Many don’t. On a handover walk in Twin Creeks, our tech pulled a camera inspection through the upstairs air handler tucked in a tight attic space and found drywall dust and construction debris caked in the flexible duct runs feeding the second-floor registers. We set up negative pressure with HEPA filtration, ran agitation tools through the supply and return ducts, and sealed the sagging joints we found along the way. The homeowners had been running the system for six weeks since move-in and were surprised the “new house” already needed a clean – the builder had never source-removed the drywall debris before closing. Call (361) 326-5060 if you suspect your builder skipped these steps.
Yes. We access joints and connections through existing service openings and register boots, using extension tools and cameras to verify our work. In Allen’s tight attic spaces, we bring protective decking to protect your ceiling and our technicians. The system stays in place; we seal around it. Call (361) 326-5060 for a free inspection and written quote.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Allen since 2004 as part of the Garrison Partners family.