Duct Sealing in Alvin - Leakage Measured, Then Priced in Writing

Fast, Reliable Duct Sealing Across Alvin

Duct sealing in Alvin typically costs $450 – $950 for a full system on a single-story home, and most jobs are completed in one visit. The work involves finding and sealing every leak in your ductwork, from the supply plenum to the register boots, so conditioned air goes into your living spaces instead of your attic. We dispatch crews to Alvin from our Houston office, and we know this area’s housing stock well: older brick ranch homes west of Highway 35 with original metal ducts, plus newer developments with flexible duct runs east of the highway. Call (713) 936-5800 to schedule an inspection with a written price before any work starts.

Call (713) 936-5800

Why Hollis Air Duct Houston Is Alvin’s Preferred Duct Sealing Company

Homeowners across Alvin keep our number for one reason: we write the price down before the job starts and it does not move at the door. That matters in a trade where a low teaser quote often becomes a much larger invoice once the van is in the driveway. Roy Castellanos leads our crew, and he holds every tech to The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, leave the site clean. No exceptions.

We carry professional equipment from Rotobrush and Nikro, the same negative-air and rotary brush systems commercial crews run, not hardware-store gear. Every technician is background-checked and uniformed, so you know who is walking into your home before they arrive. And every duct sealing job in Alvin carries the 365-Day Done Right Promise: if the repair fails within a year, we come back and make it right at no charge, including a free second visit. That promise is in writing on every job.

HVAC Duct Sealing in Alvin

HVAC Duct Sealing in Alvin addresses a problem most homeowners never see: the conditioned air your AC produces leaks out through gaps, cracks, and poorly joined duct seams before it ever reaches your rooms. In Alvin’s humid subtropical climate, where air conditioners run nine to ten months a year, those leaks pull hot attic air and moisture into the system while your cooled air escapes into the attic. The result is higher electric bills, uneven room temperatures, and ducts that stay damp enough to grow mold on the dust that settles inside.

Alvin homeowners need duct sealing when they notice rooms that never cool properly, utility bills that creep up year after year, or a musty smell when the system first kicks on. Single-story brick ranch homes from the 1960s and 1970s are the most common candidates: the original metal ductwork was often installed with unsealed seams that have been leaking for decades. A full-system duct sealing job in Alvin runs $450 – $950 depending on the number of supply and return runs and the accessibility of the attic.

Sealing Supply and Return Runs

We seal every accessible seam and joint on both supply and return sides using duct mastic and HVAC foil tape rated for the temperature swings Alvin attics see. Sealing only the supply runs while ignoring returns is a common shortcut that leaves the system pulling attic insulation, dust, and pests through the plenum. Our camera inspection covers both sides before we quote, so the written price reflects the full scope of work.

Post-Retrofit Sealing for Older Systems

Many older Alvin homes have had newer AC units installed on original ductwork that was never sized or sealed for the higher static pressure. When a 1970s system gets a modern high-efficiency condenser, the increased airflow can open existing leaks wider and whistle through loose joints. We check register readings and static pressure after sealing so the system runs at the airflow it was designed for.

Duct Repair in Alvin

Duct Repair in Alvin covers the full range of damage we see after Gulf Coast storms, years of humidity, and aging metal work: crushed or disconnected runs, rusted seams, water-damaged insulation, and pest intrusion. The crossroads for most homeowners is deciding whether damaged ductwork can be repaired and sealed, or whether it genuinely must be replaced. We make that call based on what the camera shows, and we document everything so you are not guessing when an insurance adjuster asks.

Repair pricing in Alvin starts around $250 – $400 for a localized repair like reconnecting a detached run or sealing a specific plenum leak, and runs $600 – $1,200 when multiple supply runs need repair, mastic application, and re-insulation. Rusted metal ducts in older ranch homes are repairable when the metal is still solid; if the rust has eaten through, patching is a temporary fix and replacement is the honest answer.

Water Intrusion: Seal or Replace?

After a flood or a roof leak, the deciding factor is what the inside of the duct shows. If the water was clean, the ductwork dried quickly, and the camera shows no delamination or mold growth, sealing and sanitizing is often sufficient. If the ducts sat wet, the insulation is saturated, or microbial growth is present inside the duct walls, sealing over that contamination will fail within months. We document the camera footage, moisture readings, and our findings in a written report your insurer can use.

Rusted Metal Seams in Older Ranches

In Alvin’s humidity swings, metal ducts expand and contract constantly, and foil tape applied over badly rusted seams peels within a season. When the metal is sound, we grind the rust back, apply mastic, then tape over the cured mastic so the bond holds. When the metal is too far gone, we say so plainly and give you a written replacement price instead of a repair that will not last.

Trusted Brands We Service in Alvin

We stock mastic, foil tape, and replacement components compatible with the duct systems most common in Alvin homes, including flexible ductwork from Honeywell and metal ducts paired with Guardsman filtration products. Our technicians run Rotobrush rotary brush systems and Nikro negative-air machines for the source removal work that goes hand-in-hand with proper sealing. We service all major residential HVAC brands and duct configurations, and we keep common repair parts on the truck so most Alvin jobs are completed the same day we arrive.

Common Duct Sealing Problems We See in Alvin Homes

• Agricultural dust and silt infiltration. Alvin sits at the edge of the Gulf Coast prairie, and the flat terrain means fine silt from surrounding fields finds its way into attic spaces and then into duct leaks. Sealing the supply runs without first removing that accumulated debris leaves a contaminated system that keeps blowing dust into the house.
• Unsealed metal seams on 1960s-80s ranch homes. The original ductwork in older subdivisions west of Highway 35 was often installed with slip joints that were never sealed. Those gaps pull humid attic air into the supply runs, and after a wet spring the first hot week brings a spike in musty odor complaints.
• Poorly sealed retrofitted plenums. When older Alvin homes got new AC systems, installers sometimes connected the new air handler to the old plenum without sealing the transition. That gap pulls attic insulation and mold-laced dust directly into the airflow, and it is a prime entry point for rodents and roaches.
• Humidity-driven mold on duct interiors. Alvin’s air conditioners run nine to ten months a year, keeping duct interiors cool and damp. When leaks allow attic air and dust inside, that combination creates exactly the conditions mold needs, especially during the muggy spring and fall shoulder seasons when systems cycle less and moisture lingers.

Pricing for Duct Sealing in Alvin, TX

We Also Serve Cities Near Alvin

Our crews handle duct sealing throughout northern Brazoria County and into the bay area. We serve Duct Sealing in Alvin as well as League City, Webster, Fresno, and Seabrook. If you are in any of those nearby communities, the same written pricing, background-checked technicians, and 365-Day Done Right Promise apply. Our Duct Sealing team runs the same playbook on every job, no matter the city.

FAQs About Duct Sealing in Alvin