New windows and doors improve comfort, cut energy bills and add long-term value to your home. Westlight Windows Dallas pairs proven product lines with our own installing crews for lasting performance - and a price we put in writing.
Choose your installer
The unit is half the job - the install is the other half. Our own background-checked crews measure, set, seal and insulate every opening, and they know the lines we quote inside and out because they install them every week.
Select the right products
Compare styles, materials and glass packages side by side until the fit is right for your rooms, your budget and your goals. The product-line comparison below is the place to start.
Prepare your home for install
Before install day we walk you through a short checklist - furniture pulled back, treatments down, a clear path to each opening - so install day is watch-it-happen, not scramble.
Compare the Lines We Quote
Every project is priced on the same lines, side by side - the price indicators below are relative, and your consultant shows exact numbers on your actual openings.
PGTThe line Florida homeowners arrive naming - the most Miami-Dade certifications in the industry$$$
- More Miami-Dade NOA certifications than any other line we quote
- WinGuard, EnergyVue and ClassicVue Max systems built for every wind zone
- 99% on-time delivery keeps your install date on the calendar
CGIThe heavyweight impact line$$$$$
- Large-missile impact ratings for the strictest wind zones
- Architectural-grade aluminum with commercial-depth frames
- The line we quote when protection is the whole point
CWSThe Florida value pick$$
- Vinyl systems built in Florida for Florida codes
- Strong energy packages at the friendliest price point
- The smart start for whole-home replacements on a budget
ESWSlim lines, big glass$$$$
- Narrow-sightline aluminum for modern elevations
- Oversized openings and floor-to-ceiling glass
- Impact-rated without the bunker look
ECOThe aluminum impact workhorse$$$
- Miami-built aluminum impact systems
- A strong price-to-protection ratio for coastal homes
- Proven inventory lines with short lead times
Therma-Tru Window Replacement: The Dallas Owner’s Guide
Therma-Tru window replacement in Dallas typically runs $350 to $900 per window installed, depending on sash dimensions, glass package, and whether the frame needs refitting. We stock Therma-Tru-compatible window hardware and insulated glass units, and can handle most single-window replacements within two to three days of your free measurement. Most homeowners discover the problem the same way: a sash that won’t stay up, a seal that’s fogged between the panes, or a crank mechanism that grinds instead of turns.
Therma-Tru builds a deep line of entry doors and a smaller, well-made line of windows, which means parts can be harder to track down than they should be. That’s the gap we fill. Owen Satterfield and our crew have been matching Therma-Tru window parts to the right models in Dallas homes for years now, and we don’t guess at compatibility. We measure, verify the series, and order the right piece the first time.
Which Therma-Tru Models This Applies To
Therma-Tru’s window line covers vinyl and fiberglass-composite units sold across several series, including their casement, double-hung, and picture models. The most common versions we work on in Dallas are double-hung units from the 2010s onward, though we see plenty of casement windows on older houses near White Rock Lake where the original operators gave out years ago. Compatibility isn’t universal: a sash from one Therma-Tru vintage often won’t seat correctly in a newer or older frame, even when the rough opening looks identical.
Here’s what to check before you call. Look for the AAMA certification sticker or laser-etched code on the frame edge or the top of the sash. That code tells us the exact series and manufacturing window, which is what we need to source the correct replacement. If the sticker is gone, measure the visible glass width and height to the nearest eighth of an inch, then measure the full sash width at three points. We’ll confirm the numbers during the free estimate. For most Therma-Tru units, we recommend OEM-grade replacement sashes over bargain aftermarket copies. Therma-Tru’s factory specifications include a reinforced meeting rail on double-hungs and a fiberglass composite material on many frames that generic vinyl replacements don’t match. That material matters in Dallas, where summer heat can warp a cheap sash in three years.
Signs Your Therma-Tru Window Replacement Is Failing
- Fog or condensation between the panes. The inert gas between the two glass layers has escaped and the desiccant seal is saturated. This never clears up on its own. The only fix is a replacement insulated glass unit or full sash.
- Sash won’t stay raised. On double-hungs, the constant-force balance coil inside the side jamb has snapped or stretched. This is the most common Therma-Tru failure we repair in Dallas, especially on south-facing windows that get full sun all afternoon.
- Grinding or slipping crank on a casement window. The operator gear teeth are worn or the hinge arm is binding. If you keep cranking, you’ll strip the gear entirely and the window becomes stuck shut or stuck open.
- Drafts you can feel with your hand. Weatherstripping on the sash has compressed and hardened, or the frame has settled slightly out of square. In January, a drafty window adds real money to your heating bill.
- Visible fog lines or mineral haze on the glass surface. That’s not cleanup, it’s low-e coating degradation. The thin metallic layer that reflects heat has oxidized, which also kills the window’s energy efficiency.
Replacement Cost & What’s Included
For Therma-Tru windows in Dallas, expect these installed price ranges:
- Replacement insulated glass unit: $180 to $350 installed, depending on glass size and low-e coating.
- Full sash replacement (double-hung): $275 to $550 installed per sash.
- Operator and hinge set (casement): $120 to $260 installed.
- Complete window replacement, including frame: $350 to $900 installed, depending on dimensions and glass package.
Every quote includes the part, labor to remove and reinstall the sash or glass unit, disposal of the old part, and a written Kingswell Guarantee covering the completed work. The price we write down before starting is the price you pay. If something breaks because of our installation within the guarantee period, we come back and fix it at no charge. That’s the 365-Day Done Right Promise, and it’s in writing on every job we do in Dallas.
DIY or Call Us?
There are a few things you can safely inspect yourself. Check for a loose screw on a crank handle, clear debris from the bottom track on a sliding unit, and note exactly where a draft is coming from so our technician knows where to look first. That’s useful information. What you should not do is pull the sash out of a double-hung unit to inspect the balance coils. Those coils are under constant tension, and the retaining clips can snap hard when the sash is removed incorrectly. We’ve repaired the aftermath of that particular DIY attempt more than once in Dallas, and it usually costs more than the original repair would have.
If you’ve got a Therma-Tru window that’s fogged, sagging, or grinding, call us at (361) 441-0865. We’ll measure it, confirm the series, and give you a written price before any work begins. No pressure, no door-step surprises. Just a straight answer from a Dallas crew that shows up when we say we will.
FAQs
A properly installed Therma-Tru window in Dallas can last 20 to 30 years, but the insulated glass seal typically fails between 10 and 20 years, sooner on west and south-facing walls that take the full force of the summer sun. The good news is that a failed seal doesn’t mean you need a brand-new window. Replacing just the insulated glass unit or sash gets most of that lifespan back. Call (361) 441-0865 and we’ll tell you which path makes sense for your window.
Yes, in many cases. Worn operators, broken balance coils, and failed weatherstripping can be replaced without changing the entire window. Fogged glass means the sealed airspace between panes has failed, and that specific glass unit does need replacing, but the frame and hardware can often stay put. We’ll always show you what failed, what it costs to fix, and what replacement looks like, then you decide. Estimates are free.
Most single-window replacements take 1 to 2 hours on site, from removing the old sash or glass unit to final cleanup and testing. Full frame replacements can take half a day. We stock common Therma-Tru glass thicknesses and operator kits, and anything special-ordered usually arrives within three to five business days here in Dallas. Call (361) 441-0865 to get on the schedule.
We stock the most common Therma-Tru replacement parts on our trucks: balance coils, operator and hinge sets, lock mechanisms, and standard glass thicknesses. Odd sizes, custom glass packages, and older series sashes take a few extra days. The fastest way to find out is a quick call to (361) 441-0865. We’ll tell you honestly what we have, what we need to order, and exactly when we can be there.
Written by Owen Satterfield, Owner, Westlight Windows Dallas at Westlight Windows Dallas, serving Dallas and nearby areas.
Six Reasons Homeowners Choose Westlight Windows Dallas
Laminated glass and reinforced frames hold up to wind-driven rain, hail and flying debris, so your openings stay sealed when the weather turns.
Low-E insulated impact glass from our manufacturer lines commonly cuts monthly cooling bills 20-30%.
Laminated impact glass shuts out up to 40% of outside noise - traffic, neighbors, weather.
Monitoring services run $30-90 a month. Laminated impact glass resists forced entry around the clock, with no subscription.
Tighter seals and insulated glass even out hot and cold rooms and stop the drafts at the frame.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.