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Therma-Tru Windows & Doors: The Houston Owner’s Guide
If you have a Therma-Tru door or window in Houston that’s sticking, sagging, leaking air, or showing failed weatherstripping, we can match the replacement part to your exact frame and have it installed correctly the first time. Therma-Tru window and door component replacement in Houston typically runs $150 – $1,800 for the part plus labor, depending on whether it’s a sweep, threshold, hinge set, glass panel, or full slab. Most owners discover the problem on the first cold front of October or the first hard rain of spring, when a door that worked fine all year suddenly won’t latch, or water shows up on the tile inside the entryway.
Key takeaways:
- We match replacement parts to your specific Therma-Tru frame series, not just “close enough.”
- Written price before we touch anything. You’ll know the number on day one.
- 365-Day Done Right Promise on every part we install.
- If a replacement part fails inside the guarantee period, we return and fix it at no charge.
Which Therma-Tru Models This Applies To
Therma-Tru builds doors under several frame and slab lines, and the part numbering matters. Classic-Craft, Fiber-Classic, Smooth-Star, and Pulse series doors each use different hinge geometry and threshold profiles, and the weathering system (the sweep, the bottom cap, the corner pads) is matched to the slab thickness, not the style of the door. If your door is a 1-3/4″ Fiber-Classic slab, a sweep for a 1-3/8″ Smooth-Star will not seal, even if it clips on. That is the most common mismatch we fix after a homeowner tried it themselves with a part from a big-box aisle.
To identify your door or window correctly: check the hinge edge of the slab for a printed label. If the label is gone, measure the slab thickness, the door width and height to the nearest 1/16″, and the hinge-to-hinge spacing. On windows (Therma-Tru produces doorlites and entryway sidelites more than standalone windows), the serial sticker is usually on the frame between the glass and the jamb. For OEM versus aftermarket: genuine Therma-Tru parts preserve the door’s warranty and the fit is exact. Quality aftermarket sweeps, corner pads, and strike plates work in many cases and can cost 30 – 50% less, but we tell you before we order which line we are quoting and why.
We stock common Therma-Tru-compatible parts on our trucks: bottom sweeps for 1-3/4″ slabs in bronze and clear anodized finishes, extruded aluminum thresholds in 3-3/4″ and 5-1/4″ widths, compression weatherstrip for frame jambs, ball-bearing hinges in square and radius corners, and multi-point lock gearboxes for the Tru-Defense multi-point system. Less common items, like replacement doorlites with Low-E glass and internal blinds, get ordered by size and glass package, which takes three to seven business days in Houston.
Penhallow Remodeling Houston is an independent service provider. We are not affiliated with Therma-Tru, and we don’t have to be: we work on their doors and windows every month and we know how the parts go together.
Styles & brands we work with
Signs Your Therma-Tru Windows & Doors Is Failing
- Draft at the door bottom, even with the sweep installed. The compression sweep has flattened or the threshold cap has cracked. In Houston humidity, rubber sweeps lose their rebound in three to five years.
- The door scrapes the threshold or won’t latch without lifting the handle. The hinges have worn, or the slab has settled. Ball-bearing hinges wear faster on heavily used entry doors, and a sagging slab wears the sweep and threshold unevenly.
- Condensation or fog between the glass panes in a doorlite or sidelite. The insulated glass seal has failed. This is not repairable; the glass unit gets replaced. We measure, order, and install a new sealed unit, and the old one gets hauled away.
- The multi-point lock binds, or the handle spins without engaging. On Tru-Defense systems, the gearbox is the part that fails, not usually the lock points themselves. A replacement gearbox and a clean, fresh adjustment of the keepers usually solves it.
- White chalky residue or soft spots at the bottom corners of the jamb. Water has been wicking into the frame because the threshold-to-jamb corner pad failed. The corner pad is a $10 part; ignoring it turns into a $700 jamb repair in a Houston summer.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
For Therma-Tru door and window hardware in Houston, here are the ranges we quote on most jobs:
- Bottom sweep replacement: $150 – $350 (part plus install, including adjustment to the threshold)
- Threshold replacement (aluminum or oak with vinyl cap): $400 – $900
- Weatherstripping package (sweep, compression strip, corner pads): $250 – $600
- Hinge replacement set (three hinges, ball-bearing): $350 – $750
- Tru-Defense gearbox replacement: $450 – $950, depending on trim plate finish and whether we adjust keepers on both sides
- Insulated glass replacement (doorlite or sidelite): $700 – $1,800, depending on size, Low-E coating, and whether you want internal blinds
Every one of those prices includes the part, the labor, and a written line-item quote before we start. No change orders because a part cost more than we said. If the part fails under the 365-Day Done Right Promise, we come back and make it right at no charge.
DIY or Call Us?
Sweeps and threshold caps are a safe Saturday project if you have a screwdriver and the exact replacement. The risk is ordering the wrong profile: Therma-Tru alone has over a dozen sweep types, and the difference between a snap-in and a slide-on is about an eighth of an inch. You will know in about 48 hours, when the door still drafts.
What we don’t recommend doing yourself: remounting a multi-point lock gearbox, replacing tension hinges on a heavy fiberglass slab, or pulling a frame apart to replace a threshold. The slab on a Classic-Craft door can weigh over 100 pounds, and if it drops while you are alone, it wins. Our background-checked, uniformed technicians do this work with the right equipment, and if anything goes wrong, it’s our problem and our warranty. Call (254) 527-5340 and we will get you a written price before any work starts.
FAQs
A rubber or vinyl sweep on a west-facing door in Houston lasts three to five years before it flattens and starts letting air through. Doors on shaded east entries can go a year or two longer. We replace sweeps more than any other Therma-Tru part, and it is the fastest fix on this page. Call (254) 527-5340 for a written quote; most sweep replacements are done the same visit.
If the aluminum is straight and the vinyl cap has a crack or a dip, we can sometimes replace just the cap and adjust the sweep. If the aluminum is pitted, the oak core under it is soft, or water has been getting under the threshold for more than a season, replacement is cheaper than repeatedly patching it. We will show you what we found before we quote you the price.
A sweep takes under an hour. A threshold replacement takes two to three hours. A Tru-Defense gearbox is usually 90 minutes. Insulated glass replacement for a doorlite runs an hour of install time once the glass arrives, which is three to seven business days after we measure and order. We’ll give you the timeline in writing before the work starts.
We stock the most common sweeps, thresholds, hinges, corner pads, and compression strips on our trucks, so many jobs get finished the first visit. For gearboxes and insulated glass units, we verify your part number, order it, and schedule the install when it arrives. Either way, the price is written before you pay anything.
If your Therma-Tru door or window is letting weather in, or the lock won’t engage, call (254) 527-5340 for a free estimate. A live person answers, not an answering service, and we will give you a straight written price before any work starts. Give me the straight story on what you need, and I’ll give you the straight number on what it costs.
Written by Trevor Nash, Owner, Penhallow Remodeling Houston at Penhallow Remodeling Houston, serving Houston and nearby areas.
