Duct Sealing in Nassau Bay - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Nassau Bay

Your upstairs bedroom stays stubbornly hot in July even when the AC runs nonstop. Your electric bill from CenterPoint keeps climbing, and the air coming from certain vents smells like the crawlspace. In Nassau Bay, where Gulf humidity presses against slab-built ranch homes from the 1960s and 70s, these symptoms usually trace back to the same problem: air leaking from ducts before it ever reaches your rooms.

Call (361) 326-5060

We’re Hollis Air Duct Cleaning, and our Duct Sealing crews work Nassau Bay regularly. Scheduling runs through our Dallas-Fort Worth office, but the technicians who arrive at your door on Egret Bay Boulevard or in the townhomes near Clear Lake know this city’s housing stock. They know about the original galvanized metal ducts still hiding behind newer drywall, the flex duct that got replaced after Harvey while the old runs behind it stayed wet, and the way Nassau Bay’s humidity finds every gap in a compromised system. Call (361) 326-5060 for a free estimate.

Why Hollis Air Duct Cleaning Is Nassau Bay’s Preferred Duct Sealing Company

We’ve been sealing ducts in the Clear Lake area long enough to recognize the patterns. A homeowner near NASA Road 1 calls because their system can’t keep up; we find flex duct in the attic that was never properly supported and has pulled apart at the seams. Another call comes from a ranch on Nassau Drive with musty air that returns every summer; the mastic on the original metal trunk line cracked decades ago, and humid attic air has been mixing with conditioned air ever since.

Roy Castellanos leads our operation under The Garrison Standard: written price before work starts, arrival inside the quoted window, and a 365-Day Done Right Promise backed in writing. If our seal fails within a year, we return and make it right at no charge, including a free second visit. Our technicians are background-checked and uniformed; you know who’s walking into your home before they arrive. And when you call (361) 326-5060, a live person answers, 24 hours a day, no voicemail loop.

We don’t compete on teaser prices. We compete on showing up, pricing it honestly, and standing behind the work for a full year.

Duct Sealing Services in Nassau Bay

Duct Sealing Services in Nassau Bay address the gaps, cracks, and separated joints that steal conditioned air before it reaches your living spaces. Most Nassau Bay homes we seal are 1960s-1970s ranch houses on slab foundations with original galvanized metal ductwork or early flex duct runs, many of which have been compromised by decades of Gulf humidity, minor flooding, or post-Harvey repairs that never addressed the full system. A typical whole-home duct sealing job in Nassau Bay runs $1,200 – $2,800 depending on system size and accessibility, with single-zone repairs starting around $450.

Pressure Testing and Leak Detection

We start every sealing job with a duct blaster test or calibrated pressure measurement to quantify exactly how much air you’re losing. In Nassau Bay’s older homes, we regularly find 25 – 35% leakage, which means more than a quarter of your cooling and heating budget is conditioning your attic or crawlspace instead of your rooms. The test gives us a baseline and lets us prove improvement when we’re done.

Mastic and Mechanical Sealing

We seal metal ducts with water-based duct mastic, a thick compound that remains flexible and won’t crack like old tape. For flex duct separations, we use proper mechanical connections and support straps so the joint holds under pressure. In flood-affected homes near Clear Lake, we often find that previous crews taped over wet ducts; we remove that failed work and start clean.

Duct Insulation in Nassau Bay

Duct Insulation in Nassau Bay protects sealed ducts from the temperature extremes in your attic or crawlspace, where summer heat can push uninsulated metal to 140 degrees and winter cold snaps create condensation that feeds mold. Many Nassau Bay homes have thin original fiberglass wrap that has compressed, gotten wet, or been stripped during post-flood repairs and never properly replaced. A typical attic duct insulation job in Nassau Bay runs $800 – $1,900 for a standard ranch home, with costs climbing if we need to access ducts behind finished ceilings.

Radiant Barrier and Reflective Wrap

In Nassau Bay’s unshaded attics, we often install reflective insulation or radiant barrier over duct runs to reject solar heat gain. This matters especially for east- and west-facing trunk lines that take direct morning or afternoon sun. The combination of sealed joints and proper insulation can drop attic duct surface temperature by 30 degrees or more.

Flood-Damaged Insulation Replacement

Harvey left a legacy we still encounter: insulation that was stripped after flooding but never properly replaced, or new insulation installed over damp ducts that continued to degrade. We remove compromised material, verify the duct is dry and sealed, then install fresh insulation to current standards. This prevents the musty odor cycle that hits every summer when humidity spikes.

Trusted Brands We Service in Nassau Bay

Our trucks carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration and sealing products from Honeywell, Aprilaire, and Guardsman. We stock mastic, mechanical fasteners, and insulation materials sized for the metal and flex duct systems common in Nassau Bay’s mid-century housing stock. That means most jobs don’t wait on parts. When we find a compromised section of original galvanized trunk line in a home near Space Center Boulevard, we have what we need to seal it properly before we leave.

Common Duct Sealing Problems We See in Nassau Bay Homes

• Original mastic failure on 1960s metal ducts. The water-based sealant used in original construction has dried and cracked after sixty years of Gulf Coast heat cycles. We scrape the old material and apply fresh mastic that flexes with temperature changes.
• Flex duct sag and separation in post-Harvey repairs. Many Nassau Bay homes got quick repairs after 2017 with unsupported flex duct that has since pulled apart at takeoffs. We support the runs properly and use mechanical connections, not tape alone.
• Humidity-driven mold in “hidden” original ducts. Technicians often find that post-flood renovations replaced visible ductwork but left original runs behind new drywall, still damp and now growing mold that circulates through the system every time the fan runs.
• Condensation on uninsulated metal in attic spaces. Nassau Bay’s year-round humidity hits cold duct surfaces and creates water that rusts metal, degrades nearby insulation, and breeds microbial growth. Sealing without insulating often isn’t enough.

Pricing for Duct Sealing in Nassau Bay, TX

We Also Serve Cities Near Nassau Bay

Our crews travel throughout the region from our Dallas-Fort Worth dispatch office, bringing the same written pricing and 365-Day Done Right Promise to homeowners in Houston, San Antonio, Dallas, and Fort Worth. If you’re in Nassau Bay proper, you’re getting our local Duct Sealing in Nassau Bay team that knows this city’s specific housing challenges.

FAQs About Duct Sealing in Nassau Bay