Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Duct Sealing Across Converse
Duct sealing in Converse typically runs $450 – $850 per system depending on accessibility and the extent of joint failure, and most multi-system homes here need two or three systems addressed. We’re familiar with Converse’s post-1990 subdivisions and the 1970s-era homes near the older core, and we dispatch crews from our San Antonio scheduling office to keep response times tight across Bexar County. If your upstairs won’t hold temperature or your AC runs nonstop through August, separated duct joints in a 140°F attic are the likely culprit. Call us at (361) 326-5060 for a free estimate with written pricing before any work starts.
Why Hollis Air Duct Cleaning Is Converse’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Duct Sealing team knows Converse housing stock well. The post-1990 tract homes with flex duct in attics, the smaller cluster of 1970s metal-duct homes near the original downtown, and the newer builds going up toward Cibolo all present different sealing challenges we’ve handled repeatedly.
Our technicians are background-checked and uniformed, and they operate under The Garrison Standard: arrive inside the quoted window, price the job in writing before touching anything, complete the work by the book, and leave the site clean. Every repair carries our 365-Day Done Right Promise in writing. If the seal fails within a year, we come back and make it right at no charge, including a free second visit if needed.
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.
Duct Repair in Converse
Duct Repair in Converse usually addresses physical damage to the duct system itself: separated flex joints, crushed or kinked runs, corroded metal connections in older homes, or sections compromised by critter intrusion. In Converse’s market, duct repair typically costs $280 – $550 per issue location, with whole-system repairs on longer attic runs running toward the higher end. You need it when airflow drops to specific rooms, when you feel hot attic air blowing from a supply vent, or when your energy bill spikes without explanation.
Heat-Damaged Flex Joints
In Converse’s newer subdivisions, attic temperatures routinely exceed 140°F through July and August. That heat cooks flex duct insulation until it degrades and joints pull apart. We replace the damaged flex section, seal the new connection with mastic and mechanical fasteners, and re-support the run so it doesn’t sag back into the same failure mode.
Critter and Moisture Damage
Converse’s humid summers create condensation inside attic ducts, which softens tape adhesives and attracts rodents. We remove the compromised section, inspect for active intrusion points, install new material, and seal with products rated for damp conditions.
Air Duct Sealing in Converse
Air Duct Sealing in Converse targets the gaps, seams, and connection points where conditioned air leaks into your attic instead of reaching your rooms. This is different from duct repair: sealing addresses intact ductwork that was never properly closed at installation, or where original seals have aged out. A typical air duct sealing job in Converse runs $450 – $850 per system, with whole-home jobs on three-system houses ranging $1,200 – $2,400 depending on total linear footage and attic accessibility.
Mastic vs. Tape Sealing
We use duct sealing mastic, a water-based compound that brushes onto joints and hardens into a permanent, flexible seal. It outlasts foil tape in Converse’s heat and humidity. For metal ducts in older homes, we combine mastic with fiberglass mesh reinforcement at high-stress joints.
Post-Seal Pressure Testing
After sealing, we run a pressure test to verify the system holds. You get the before-and-after numbers in writing. In Converse’s multi-system homes, we test each air handler separately so you know which system was improved and by how much.
Trusted Brands We Service in Converse
Our crews carry professional-grade equipment from Nikro negative-air systems to Honeywell and Aprilaire filtration components. For Converse homeowners, this means we stock the connectors, collars, and sealants that match your existing ductwork rather than ordering parts and making you wait. If your system uses Abatement Technologies filtration media, we carry compatible replacement stock. The tools are the same ones commercial crews use; we just explain what they do in plain terms before we start.
Common Duct Sealing Problems We See in Converse Homes
- Heat-cooked flex joints in 140°F attics. In Converse’s post-1990 subdivisions, summer attic temperatures degrade flex duct insulation until joints separate. By August we’re not just sealing loose seams; we’re replacing heat-damaged material and re-supporting runs that have sagged off their hangers.
- Partial sealing on multi-system homes. A lot of Converse houses run two or three air handlers, and some homeowners get one system sealed while the other two keep leaking into the attic. We price per system so you know exactly what each costs and can phase the work if needed.
- Condensation and mold compromising seal surfaces. Converse’s humid summers create moisture inside attic ducts. If the duct surface is moldy or damp, mastic won’t bond properly. We clean and dry the surface first, then seal, so the repair actually lasts.
- Critter intrusion reopening sealed joints. Rodents in Converse attics chew through flex duct and dislodge sealed connections. We seal with damage-resistant materials where accessible and flag active intrusion points for pest control follow-up.
Pricing for Duct Sealing in Converse, TX
A typical single-system duct sealing job in Converse runs $450 – $850. Two-system homes usually fall in the $900 – $1,600 range, and three-system houses with long attic runs range $1,200 – $2,400. What moves you within that range: total linear footage of duct, how much of it is accessible versus buried under insulation, whether we’re sealing intact joints or replacing heat-damaged flex first, and whether the system needs post-seal pressure testing documented for your records.
We do not quote per-vent pricing. You get one flat price per system, agreed in writing before work starts. The price does not move at the door. Estimates are free, and we show you camera footage of what we found so you understand why the work is recommended.
We Also Serve Cities Near Converse
Our crews work throughout the San Antonio metro area, including Duct Sealing in Converse plus Universal City, Schertz, Cibolo, and San Antonio proper. Dispatch is coordinated from our San Antonio office to keep arrival windows tight.
Serving Converse, TX - Our Local Coverage Area
We’re based in the Converse area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Duct Sealing in Converse
Yes, we can seal all three in one visit, and we price each system separately so you know exactly what each costs before we start. Most Converse homes with multiple systems have long attic runs between the air handler and the farthest vents, so we inspect each system with a camera, identify the worst leaks, and sequence the sealing to minimize time in your attic. Call (361) 326-5060 for a free estimate on your specific layout.
Separated flex joints in a 140°F attic are the most common cause we find in Converse. The upstairs unit typically has the longest duct run, and when joints pull apart under summer heat, cooled air dumps into the attic instead of reaching the second floor. We run camera inspection on both supply and return ducts, seal the failed connections, and re-support sagging flex with new hangers so the system can hold setpoint without running nonstop. Call (361) 326-5060 to schedule a look.
We can seal them after the damage is addressed. Mold and moisture prevent mastic from bonding, and chewed flex needs replacement, not just sealing. We clean the surface, replace compromised sections, then seal with materials rated for Converse’s damp attic conditions. Call (361) 326-5060 and we’ll show you exactly what we’re working with via camera inspection.
You get before-and-after photos from the camera inspection, a written pressure test showing leakage reduction per system, and your invoice with the 365-Day Done Right Promise noted. For Converse’s multi-system homes, we break out each air handler separately so you have a record of what was sealed where. This matters when you sell the house or when a system starts underperforming again and you need to know what was already addressed.
It helps with both. Sealed return ducts don’t pull in attic dust, pollen from Converse’s oak and cedar trees, or fiberglass insulation particles. Sealed supply ducts deliver all your filtered air to the rooms instead of losing it to the attic. Most Converse homeowners notice less dust on surfaces and fewer allergy flare-ups within a few weeks of sealing, plus the AC doesn’t work as hard to maintain temperature. Call (361) 326-5060 for an estimate.
Schedule Your Free Duct Sealing Estimate in Converse
We run a lot of two- and three-system homes in Converse, and last August a crew was out on a three-system house off FM 78 where the upstairs unit was losing cooling into a 140°F attic through separated flex joints. Our tech ran camera inspection on both supply and return ducts, found the failed connections on the longest run, then sealed them and re-supported the sagging flex with new hangers. The homeowner said the upstairs finally held setpoint without the unit running nonstop.
If your Converse home has multiple systems, long attic runs, or rooms that never keep up in summer, we’ll inspect every air handler, show you what we find, and give you a written per-system price before any work starts. Every job is covered by our 365-Day Done Right Promise: if the seal fails within a year, we come back and make it right at no charge.
Call (361) 326-5060 today for your free estimate. Phones are answered by a live person 24/7.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Converse and the greater San Antonio area.