Duct Sealing in Highland Park - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Highland Park

If your upstairs rooms never cool down in July, or your energy bills spike every summer despite a new HVAC unit, the problem is probably not your compressor. It’s the gaps and separations in your ductwork leaking conditioned air into your attic, crawl space, or walls before it ever reaches the vent. In Highland Park, where most homes were built between the 1920s and 1950s with original or lightly updated duct systems, we see this exact pattern on nearly every job we run near Preston Road, Lakeside Drive, and the neighborhoods around Highland Park Village.

Call (361) 326-5060

Our Duct Sealing team dispatches from our Dallas-Fort Worth office and serves Highland Park directly. We’re familiar with the alley-access garages, the mature oak canopy that keeps technicians parking curbside, and the plaster-walled chases where ductwork hides in these older homes. Call (361) 326-5060 for a free estimate. We’ll show up in the window we promised, price the job in writing before we touch anything, and stand behind it for a full year.

Why Hollis Air Duct Cleaning Is Highland Park’s Preferred Duct Sealing Company

We’ve been in business since 2004 as part of the Garrison Partners family, and our reputation in Highland Park is built on showing up when we say we will and leaving the site clean. That sounds basic, but in a market where homeowners regularly tell us about no-shows and crews who tracked dust through the foyer, it’s not.

Our technicians are background-checked and uniformed, and they operate under The Garrison Code: arrive inside the quoted window, price in writing, complete the job by the book, leave the site clean. There’s no mystery about who walks into your home.

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.

Every repair we perform in Highland Park carries our 365-Day Done Right Promise. If the work fails within a year, we return and make it right at no charge, including a free second visit. That’s written on every job, not implied.

Duct Sealing Services in Highland Park

Duct Sealing Services in Highland Park address the gaps, separations, and deteriorated connections in your forced-air system that leak conditioned air before it reaches your rooms. Most Highland Park homes we work on, whether a 1930s Tudor near Beverly Drive or a 1990s teardown replacement on Euclid Avenue, have duct leakage rates of 20 to 40 percent. That means nearly half the air your HVAC produces never makes it to the vent. We seal supply and return plenums, register boots, trunk line connections, and longitudinal seams using professional-grade mastic and reinforced mesh tape, not the foil tape that dries and fails within a few seasons.

A typical duct sealing job in Highland Park runs $450 – $1,200 for a whole-home system, depending on accessibility and the extent of separation. Homes with original ductwork behind plaster walls require more labor than those with exposed basement or attic runs.

Supply and Return Plenum Sealing

The plenum is the central distribution box where your furnace or air handler connects to the trunk lines. In Highland Park’s older homes, these connections often loosen over decades of thermal expansion and vibration. We remove old tape, clean the surface, and apply duct sealing mastic with fiberglass mesh for a permanent bond that flexes without cracking.

Register Boot and Trunk Line Repair

Where the metal boot meets your floor or wall register, gaps open from house settling, especially common in Highland Park’s pre-1960s foundations. We seal these junctions and repair separated trunk line sections, then pressure-test the system to verify leakage reduction.

Duct Insulation in Highland Park

Duct Insulation in Highland Park protects sealed ductwork from the extreme temperature swings in attics and crawl spaces, where summer air can reach 140 degrees and winter air drops below freezing. Even perfectly sealed ducts will lose efficiency if they run through unconditioned space without proper insulation. In Highland Park, where many homes have ductwork routed through original attic spaces with minimal existing insulation, this is a common secondary issue we identify during sealing jobs.

Duct insulation typically adds $300 – $800 to a sealing project in Highland Park, depending on linear footage and whether we’re wrapping existing ducts or replacing degraded fiberglass. We use professional-grade materials from Abatement Technologies and Guardsman, not the big-box sleeve insulation that compresses and loses R-value within a few years.

Rigid Duct Board and Wrap Installation

For trunk lines in Highland Park attics, we install foil-faced fiberglass wrap at specified R-values, sealed at all seams to prevent moisture intrusion. North Texas humidity makes vapor barrier integrity critical; wet insulation breeds mold and collapses into the duct.

Closed-Cell Spray Foam for Hard-to-Reach Runs

Where ducts pass through tight chases behind plaster walls, particularly in the original homes near Highland Park Village, spray foam provides both air sealing and insulation in one application. We use this selectively, only where traditional wrap cannot be installed effectively.

Trusted Brands We Service in Highland Park

We carry professional-grade equipment and materials from Rotobrush, Nikro, Abatement Technologies, and Guardsman, the same tools and filtration products commercial crews use in hospitals and schools. For Highland Park homeowners, this means we stock the specialized plenum sealants, high-temperature mastics, and foil-faced insulation widths that fit older duct dimensions, not just standard new-construction sizes. When we find a unique fitting or connection type in a 1940s home near Armstrong Parkway, we don’t need to order parts and return next week. Our van inventory covers it, and our turnaround reflects that readiness.

Common Duct Sealing Problems We See in Highland Park Homes

• Original ductwork hidden behind plaster walls. In Highland Park’s 1920s – 1950s homes, return-air chases were often built into wall cavities with no access panel. We locate leaks using pressure diagnostics and seal through existing registers or small strategic openings, minimizing plaster disruption.
• Undersized return paths choking airflow. Many historic Highland Park homes were designed with returns too small for modern HVAC capacity. The system runs longer, pressures build, and seams separate faster. Sealing helps, but we also flag when return modification is the real fix.
• Organic debris accelerating tape failure. Highland Park’s strict tree preservation ordinance keeps mature oak and pecan canopies dense against homes. Pollen, leaf particulate, and fine soot from spring cedar season infiltrate attic vents and coat duct surfaces, breaking down adhesive seals years faster than in tree-sparse neighborhoods.
• Teardown replacements with modern tight systems. The 1990s – 2000s rebuilds on Euclid and similar streets have well-sealed ducts but often lack insulation at exterior wall penetrations. We seal these thermal bridges where conditioned air meets unconditioned framing.

Pricing for Duct Sealing in Highland Park, TX

We Also Serve Cities Near Highland Park

Our crews work throughout the Dallas-Fort Worth metroplex and travel to Highland Park regularly from our local office. We also handle Air Duct Cleaning in Highland Park and Dryer Vent Cleaning in Highland Park for homeowners who want their full system addressed in one visit. If you’re in Houston, San Antonio, Dallas, or Fort Worth, we have coverage there too. Just ask when you call.

FAQs About Duct Sealing in Highland Park