Guardsman Duct Repair & Sealing Nationwide

Guardsman Duct Repair & Sealing in San Antonio: What to Know First

We provide independent Guardsman duct repair and sealing in San Antonio, with most jobs completed in a single visit and a written price delivered before any panel comes off. A typical Guardsman repair runs $340-$780 depending on whether we’re sealing register boots, patching flex duct, or rebuilding a plenum connection. The camera goes in first. Then we talk.

Call (726) 600-7155

This page is for San Antonio homeowners who found Guardsman equipment in their HVAC system, noticed uneven airflow, rising utility bills, or dust pouring from a register, and want to know what fixing it actually involves. We are not affiliated with or authorized by Guardsman. We are an independent service provider that works on Guardsman products daily, along with Lennox, Trane, and Carrier systems. Call (726) 600-7155 for a free estimate with a written price.

How Guardsman Products Fail - and How We Fix Them

• Guardsman Flex Series GFD-25 and GFD-50: The inner liner separates from the wire helix in San Antonio’s heat, especially in attic runs above 140°F in July and August. The duct collapses partially or fully, choking airflow to the far end of the house. We cut back to sound material, install a fresh flex section with a mechanical splice, and seal with mastic, not tape alone. The photo record shows the collapsed section and the rebuilt connection.
• Guardsman Rigid Metal RD-100 plenum connections: The factory-sealed corners fatigue where the plenum meets the air handler, particularly in homes near Stone Oak and Alamo Ranch built 2015-2020 with rapid-cycling systems. We find hairline cracks that bypass filter media entirely. Our fix is to break down the joint, rebuild with galvanized sheet metal, and seal with fiber-reinforced mastic rated for the pressure class. We pressure-test before closing.
• Guardsman Register Boot RB-6 and RB-8 lines: The sheet-metal-to-drywall seal fails, not the boot itself. Conditioned air pumps into the wall cavity instead of the room. In San Antonio’s cooling-dominant climate, this is invisible money loss. We remove the boot, seal the platform with closed-cell foam and mastic, and reinstall. The thermal camera confirms the fix on the spot.
• Guardsman Insulated Flex IFD-12: The vapor barrier outer jacket degrades in UV-exposed attic runs, letting fiberglass insulation get wet from condensation during our humid spring months. Wet insulation collapses the inner diameter. We replace the full run with new R-8 flex, support it with wide straps to prevent sag, and photograph the old wet section for the job record.
• Guardsman Mastic-sealed joints, 2016-2019 production: A batch of water-based mastic dried brittle in low-humidity winter installs, cracking by the second summer. We see this in Terrell Hills and Monte Vista renovations. The fix is full removal of the failed mastic, surface prep, and reapplication with solvent-based duct sealant rated for 200°F continuous. We date-stamp the repair in the written scope.

Our Guardsman Duct Repair & Sealing Process

1. 1
   Scope with the camera. We run a borescope through every accessible duct run, Guardsman or otherwise, and photograph what we find. You see the image before we write a number.
2. 2
   Written price, Haven Standard Clause 1. We deliver a single flat price per system, itemized by repair type, with no per-vent add-ons. You approve in writing or we leave. No charge for the diagnosis.
3. 3
   Parts decision. For Guardsman-specific components, we source OEM when available and practical. For universal items like flex duct or mastic, we use quality aftermarket that meets or exceeds the original spec. We note the choice on the work order.
4. 4
   Repair and seal. Our crew performs the work under negative-pressure containment if needed, seals all joints to SMACNA standards, and supports flex runs to prevent repeat sag or collapse.
5. 5
   Pressure test and thermal verify. We test static pressure before and after, and use thermal imaging on register boots to confirm no bypass. The numbers go in your job record.
6. 6
   Photo record and 365-Day Done Right Promise. You receive before-and-after images of every run we touched, plus the written scope and warranty. If it’s not right, we make it right. That’s Haven Standard Clause 5.

Before

After

What Guardsman Duct Repair & Sealing Costs in San Antonio

These are whole-system prices agreed before work starts, not per-vent teaser rates that balloon once the truck is in your driveway. Bring us a competitor’s written estimate and we’ll deliver a free second opinion, our number next to theirs. Call (726) 600-7155 for an exact quote on your Guardsman system.

Why San Antonio Homeowners Call CleanRun Air Duct Cleaning San Antonio for Guardsman Work

We’ve worked on Guardsman equipment in San Antonio since 2013, and we’ve logged enough jobs to know which series crack where, which attic runs sag in July heat, and which mastic batches failed. Tomas Reyes, our owner, trained in HVAC systems technology at Queensborough Community College and spent years doing hands-on ductwork across the Northeast before building CleanRun’s crew here. He still pulls out a camera scope before writing a single number on a quote sheet.

Our technicians are background-checked, uniformed, and identified by name before arrival, per Haven Standard Clause 3: Verified Crews. They work with Rotobrush, Nikro, Abatement Technologies, and Guardsman-compatible materials you can look up yourself. Every job carries the 365-Day Done Right Promise in writing, and every customer gets the documented photo record. We also service Lennox, Trane, and Carrier systems, so we’re not guessing when your Guardsman equipment interfaces with another brand’s air handler.

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