Duct Sealing in Cedar Hill - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Cedar Hill

Duct sealing in Cedar Hill typically runs $450 – $1,200 for a whole-home seal, depending on whether we’re patching accessible joints in flex duct or resealing original 1970s – 80s rigid metal runs near the historic downtown. Most Cedar Hill jobs finish in a single visit, and we write the price down before any mastic goes on. Call (361) 326-5060 for a free estimate.

Call (361) 326-5060

We’ve been driving to Cedar Hill from our Dallas-Fort Worth dispatch office for years. We know the difference between a 1985 tract home off FM 1382 and a 2005 build in the Hills of Cedar Hill, and we know what each era of construction hides above the ceiling. That matters because duct sealing isn’t guesswork. It’s knowing whether your attic holds sagging R-8 flex duct or original rigid metal with joints that have worked loose through forty Texas summers. Our Duct Sealing team arrives uniformed, background-checked, and on time, with the same Rotobrush and Nikro equipment we use on commercial jobs across North Texas.

Why Hollis Air Duct Cleaning Is Cedar Hill’s Preferred Duct Sealing Company

Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004, and our Cedar Hill reputation is built on showing up when we said we would and leaving the site clean. We don’t compete on teaser coupons. We compete on discipline: written price, written guarantee, work done by the book.

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

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 morning to schedule.

We know Cedar Hill’s housing stock. We’ve sealed ducts in homes off Belt Line Road, in the Lake Ridge area, and in the older neighborhoods near the historic downtown where original metal ductwork still carries air. That local knowledge means we diagnose faster and quote accurately the first time.

HVAC Duct Sealing in Cedar Hill

HVAC Duct Sealing in Cedar Hill means finding the leaks in your supply and return ductwork, then sealing them with mastic and mesh or mechanical fasteners so conditioned air reaches your rooms instead of your attic. Most Cedar Hill homes built from the 1980s through the 2010s use R-6 or R-8 flex duct in unconditioned attics. That flex sags over time, pulls loose at collars, and develops gaps where tape has dried and failed. Older homes near historic downtown Cedar Hill may still have original rigid metal duct with leaky joints and disconnected runs that a visual check misses because the gaps hide above insulation. A typical whole-home HVAC duct sealing in Cedar Hill runs $450 – $1,200. Partial sealing of a single zone or accessible leak repair starts around $250 – $450.

When Sealing Beats Replacement

Not every leaky duct needs to be torn out. If the duct material itself is intact, no crushed runs, no rodent damage, no widespread mold saturation, sealing the joints and collars restores airflow at a fraction of replacement cost. We inspect with a camera first, show you what we find, and quote sealing separately from replacement so you can decide.

The Garrison Standard on Every Job

Our technicians work under The Garrison Code: arrive inside the quoted window, price in writing before touching anything, complete the job by the book, and leave the site clean. That standard applies whether we’re sealing a single return plenum in a Cedar Hill condo or a full attic system in a home off Pleasant Run Road.

Duct Repair in Cedar Hill

Duct Repair in Cedar Hill addresses the damage that sealing alone won’t fix: crushed flex runs, disconnected collars, corroded metal joints, or sections degraded by years of attic heat and moisture. We see this most often in two Cedar Hill housing types: the 1970s – 80s homes near historic downtown with original rigid metal duct that has separated at seams, and the 1990s – 2000s builds with flex duct that has sagged, kinked, or pulled loose from plenums. Duct repair in Cedar Hill typically costs $350 – $900 depending on material, accessibility, and whether we’re replacing a single run or rebuilding a plenum connection. Every repair gets a written price before work starts and is covered by our 365-Day Done Right Promise.

Crushed and Disconnected Runs

Flex duct in Cedar Hill attics gets crushed by storage boxes, compressed insulation, or workers who stepped in the wrong place. A crushed run chokes airflow to a room and strains your HVAC system. We cut out the damaged section, splice in new R-8 flex with proper collars and supports, and seal every joint.

Metal Duct Corrosion and Separation

Original metal duct in older Cedar Hill homes corrodes at the joints where condensation collects. The metal itself may be sound, but the seal is gone. We rebuild those joints with mastic and mesh, or replace short sections when corrosion has eaten through the metal wall.

Trusted Brands We Service in Cedar Hill

We seal and repair ductwork connected to every major HVAC brand found in Cedar Hill homes: Trane, Carrier, Lennox, Rheem, Goodman, American Standard, and more. We carry mastic, mesh, collars, and flex duct from Abatement Technologies and Guardsman on our vans, so most Cedar Hill repairs don’t wait on parts. For filtration upgrades after sealing, we stock Honeywell and Aprilaire media filters. That local inventory means we finish most jobs in one visit instead of scheduling a return trip.

Common Duct Sealing Problems We See in Cedar Hill Homes

• Cedar pollen infiltration through leaky returns. After a Cedar Hill cedar fever season, technicians often find a fine orange-brown film of juniper pollen inside return ducts and blower compartments. Homeowners mistake it for rust or dirt, but it’s the signature local allergen. Sealing the return ductwork is what stops that pollen from being re-entrained every time the air handler cycles.
• Condensation and mold at flex duct joints. Cedar Hill’s humid subtropical summers bring attic temperatures that swing from 140°F days to cooler evenings. That temperature differential causes condensation inside poorly sealed flex duct, and the moisture feeds mold growth at the very joints that should be airtight. Sealing eliminates the moisture entry point.
• Disconnected rigid metal joints above insulation. In 1970s – 80s homes near historic downtown Cedar Hill, original rigid metal supply and return ducts develop gaps at joints and seams. These separations hide above blown-in insulation, so homeowners feel the symptom, rooms that won’t cool, without seeing the cause until we run a camera.
• Sagging flex duct pulling loose at plenums. Cedar Hill’s R-6 and R-8 flex duct, common in 1980s – 2010s construction, sags between supports over time. The sag creates a low point where debris collects, and the weight pulls the duct loose from the plenum collar. We re-support the run and seal the collar to restore proper airflow.

Pricing for Duct Sealing in Cedar Hill, TX

We Also Serve Cities Near Cedar Hill

Our crews serve Cedar Hill and the surrounding communities: DeSoto, Duncanville, Midlothian, and Red Oak. Same equipment, same written pricing, same 365-Day Done Right Promise in every city we touch.

FAQs About Duct Sealing in Cedar Hill