Duct Sealing in Midlothian - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Midlothian

Duct sealing in Midlothian typically runs $400 – $1,200 for a whole-home system, and most jobs are scheduled within a few days of your call. If your vents blow dust even after cleaning, or your upstairs rooms never cool properly, the problem is usually leaks at joints and seams, not your AC unit itself.

Call (361) 326-5060

We’ve worked in Midlothian since 2004, and our crews know the local housing stock: the 1980s ranch homes off FM 663, the new construction near Bristol Park, and the older neighborhoods around Mockingbird Lane where original metal ductwork is still in place. Dispatch and scheduling are coordinated from our Dallas-Fort Worth office, but the technicians who arrive at your door live and work in this area. They understand that Midlothian’s three south-side cement plants create a unique maintenance burden, and they carry the right sealants and tools for what we actually find in local attics. Call (361) 326-5060 to schedule a free estimate, or read on to learn what drives costs and results here.

Why Hollis Air Duct Cleaning Is Midlothian’s Preferred Duct Sealing Company

Hollis Air Duct Cleaning operates under The Garrison Standard, which means written prices, written guarantees, and no moving targets. In Midlothian, that standard matters because too many homeowners have watched a quoted price double once the technician is inside.

Our 365-Day Done Right Promise covers every duct sealing job in writing: if the seal fails or the leak returns within a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.

Every technician is background-checked and uniformed. You know who’s arriving before they pull into your driveway. And when you call (361) 326-5060, a live person answers, 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday for a scheduling question.

We don’t compete on the lowest teaser price. We compete on discipline: arrive inside the quoted window, price it in writing before any work starts, complete the job by the book, and leave the site clean. That’s The Garrison Code, and it’s how our Duct Sealing team operates on every Midlothian job.

Duct Repair in Midlothian

Duct Repair in Midlothian often starts with a complaint that sounds like an equipment problem: uneven temperatures, high electric bills, or a system that runs constantly. What we find, especially in the ranch homes built between 1985 and 1995, is original metal ductwork with pinhole corrosion, disconnected runs in the attic, or crushed sections where a homeowner or previous contractor stepped on the line.

Repair means restoring the physical integrity of the duct system before any sealing work can hold. We use camera inspection to locate the damage, then replace or reconnect the affected sections. A typical duct repair in Midlothian runs $300 – $800 depending on accessibility and the extent of the damage. Homes near the old quarry areas on the west side often need more extensive work due to heavier dust accumulation and corrosion.

Disconnected Runs in Older Attics

Original metal ducts in Midlothian’s 1980s and 1990s homes were often secured with strap hangers that fatigue over decades in hot attics. We regularly find supply lines that have dropped completely free of the plenum, blowing conditioned air directly into insulation. Camera inspection confirms the location; we reconnect with proper supports and seal the joint.

Crushed Flexible Ductwork

Newer Midlothian homes with flexible ductwork in unconditioned attics suffer when storage boxes, Christmas decorations, or maintenance workers compress the line. A kinked flex duct can reduce airflow by 50% or more. We replace the damaged section with properly sized flex, support it to prevent future crushing, and seal all connections with mastic.

Air Duct Sealing in Midlothian

Air Duct Sealing in Midlothian is the step that comes after repair, or the primary fix when your ductwork is physically intact but leaking at joints, seams, and connections. The goal is simple: return the air you’re paying to condition to the rooms where you actually live, not your attic or crawl space.

We seal with mastic and foil tape, applied to all accessible joints after source removal cleaning. Mastic is a thick, water-based sealant that remains flexible after curing; it fills gaps and small irregularities that tape alone cannot cover. Foil tape reinforces the seal at high-stress joints. A typical whole-home air duct sealing in Midlothian runs $400 – $1,200, with most single-system homes falling in the $600 – $900 range. Two-story homes with zoned systems, or homes with ductwork in multiple unconditioned spaces, trend toward the higher end.

Sealing After Cement-Dust Cleaning

Here’s where Midlothian differs from every suburb around it. The alkaline gray dust from the south-side cement plants settles into duct joints and erodes existing mastic and foil tape. Sealing over that residue guarantees failure. Our crews clean first, using negative-air methods and rotary brush agitation to remove the alkaline film, then seal. The sealant bonds to metal, not dust.

Static Pressure Testing Before and After

We measure static pressure at the air handler before we start and after we finish. A properly sealed system shows a measurable drop in static pressure, which means your blower motor works less hard to move the same air. We show you the numbers. It’s concrete proof the work did what we said it would.

Trusted Brands We Service in Midlothian

Hollis Air Duct Cleaning carries professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and we stock filtration and sealing products from Honeywell, Aprilaire, and Guardsman. For Midlothian homeowners, that means no waiting on parts shipped from Dallas or Fort Worth. Our vans carry mastic, foil tape, flex duct, and connection collars sized for the systems we encounter in local homes, from the original metal trunks in 1980s ranches to the flexible ductwork in new construction near Bristol Park. If your repair needs a specific fitting or sealant type, we likely have it on the van. That keeps turnaround short and scheduling predictable.

Common Duct Sealing Problems We See in Midlothian Homes

• Alkaline dust erosion at duct joints. The cement-plant gray film that coats registers and returns is abrasive enough to break down mastic and foil tape within a few years. Homes south of Highway 287 and west toward the quarry areas see this most severely. Sealing without cleaning first is a waste of money.
• Disconnected metal runs in 1980s-90s attics. Original strap hangers fail after decades of thermal cycling. We find supply lines blowing into insulation, sometimes multiple runs on the same system. The homeowner knows only that the back bedrooms never cool.
• Crushed or kinked flexible duct in new-build attics. Midlothian’s construction boom from 2005 onward left many homes with flex duct routed through tight, unconditioned attic spaces. Storage, maintenance work, or poor original installation compresses the line. Sealing won’t fix a duct that’s physically pinched.
• Drywall dust and construction debris in newer systems. Builders don’t always protect duct openings during construction. We’ve pulled pounds of drywall compound and sawdust from systems less than five years old. That debris accelerates seal failure and restricts airflow.

Pricing for Duct Sealing in Midlothian, TX

We Also Serve Cities Near Midlothian

Our crews regularly work in Midlothian and the surrounding communities: Venus to the south, Cedar Hill to the northeast, Mansfield to the west, and Waxahachie to the east. Scheduling is coordinated from our Dallas-Fort Worth office, with local technicians dispatched to each area. The same written pricing, same 365-Day Done Right Promise, same uniformed crews apply whether you’re in Midlothian proper or one of these neighboring cities.

FAQs About Duct Sealing in Midlothian