Guardsman Duct Sealing Nationwide

Guardsman Duct Sealing in Houston: What to Know First

Guardsman duct sealing in Houston typically runs between $450 and $1,200 for a full-system seal, with most jobs completed in a single day. We’re an independent Guardsman service provider, not a factory-authorized dealer, which means we answer to you and your ductwork, not a corporate warranty office. The price is written down before we touch anything, and it does not move at the door.

Call (713) 936-5800

If you own a Guardsman filtration system feeding into leaking ductwork, call (713) 936-5800 and we’ll give you an exact quote based on what’s actually in your attic.

How Guardsman Products Fail – and How We Fix Them

After well over a decade working Houston attics, we’ve seen every way a Guardsman setup can lose air. Here’s what actually fails and what we do about it.

• Leaky media cabinet seams on Guardsman AirHandler series units. The media cabinet that holds the filtration media pulls apart at the corners after a few Houston summers. Hot, humid attic air gets pulled in downstream of the filter, which defeats the whole point of the system. We remove the cabinet, re-seat it with fresh mastic, and seal the return plenum so the only air moving past that filter is the air it’s supposed to filter.
• Disconnected flex duct at the Guardsman UV-C or media filter housing. We find this in Energy Corridor homes built in the 1990s more often than anywhere else. The flex duct slips off the collar because the original installer used duct tape, and duct tape does not survive a Houston attic. We reattach with screws and seal with a UL 181-rated mastic that holds for years, not months.
• Return-side leaks pulling attic air into Guardsman-filtered systems. This is the failure most Houston homeowners feel but never see. The supply side is sealed, but the return side has a dozen small leaks that pull fiberglass and dust-laden attic air around the filters instead of through them. We smoke-test the return, find every leak, and seal them. This is the repair that makes a Guardsman system actually filter what the box says it filters.
• Cracked plenum connections on Guardsman coil boxes. Houston’s humidity cycle expands and contracts the metal, and eventually the mastic fails at the plenum-to-coil joint. The system starts blowing conditioned air into the attic, which pushes your AC bill up whether you notice it or not. We re-seal the plenum with commercial-grade mastic and re-test static pressure before we leave.
• Improperly seated Guardsman filter media creating bypass. If the media isn’t seated flush in the cabinet, air skirts around it. This isn’t a duct leak in the traditional sense, but it behaves like one: unfiltered air in, filtered air out of the loop entirely. We check the media seat as part of every Guardsman sealing job and correct the cabinet fit or replace worn gaskets.

Our Guardsman Duct Sealing Process

1. 1
   Call and book a diagnostic visit. A live person answers at (713) 936-5800, 24 hours a day. We book a window and we arrive inside it, uniformed and background-checked.
2. 2
   We inspect the system, including the Guardsman filter housing and surrounding duct. We test static pressure, inspect every accessible section from the media cabinet to the supply registers, and note exactly where air is leaving the system.
3. 3
   You get a written price before we touch anything. This is the Garrison Standard, and it’s non-negotiable. The price we hand you is the price you pay. No “found something else” after the tech is in your attic.
4. 4
   We seal every joint with a UL 181-rated mastic. For Guardsman housings, we use the same mastic commercial crews run in Houston health-care and office towers. It’s not caulk from a hardware store. It goes on once and stays put.
5. 5
   We verify the seal with pressure testing. Before we pack up, we re-test static pressure to confirm the system is moving air the way it should. You’ll see the before-and-after numbers, not just a promise that we “fixed it.”
6. 6
   We leave the site clean and hand you the guarantee in writing. Every Guardsman sealing job carries the 365-Day Done Right Promise: if it fails within a year, we come back and make it right at no charge.

What Guardsman Duct Sealing Costs in Houston

Here’s what we charge, in plain terms, for the most common Guardsman scenarios we see in Houston homes.

What moves the price: house size, how accessible the ductwork is in your attic, and whether the leak is isolated or spread across the whole system. If you have a two-story house with the air handler in a finished attic, expect to be on the higher end. Call (713) 936-5800 for a free, written estimate before you decide anything.

Why Houston Homeowners Call Hollis Air Duct Houston for Guardsman Work

Roy Castellanos and his crew have been in Houston attics long enough to know which Guardsman housings fail, where they fail, and how to seal them so they stay sealed. We run on The Garrison Code: arrive inside the window, price in writing, do the work by the book, leave the site clean. Every sealing job carries the 365-Day Done Right Promise, so if the repair fails within a year, we return free. We also service Lennox, Trane, and Carrier systems, which means we know how Guardsman filtration integrates into whatever furnace or air handler is actually moving the air. That’s useful when the leak is at the connection point, and the connection point involves two different brands.

Clean air doesn’t announce itself – you just stop noticing the problem.

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