Therma-Tru Window Installation Nationwide | Sightline Windows & Doors Boca Raton

Therma-Tru Window Installation: The Boca Raton Owner’s Guide

Therma-Tru window installation in Boca Raton typically runs $1,800-$4,200 per opening depending on series, glass package, and whether the frame needs reframing for impact compliance. We stock Therma-Tru-compatible frames, sashes, and hardware for same-day installation on most jobs booked before noon. Most Boca Raton owners discover their Therma-Tru window is failing when the sash won’t stay open, the lock no longer seats flush, or they feel Atlantic-driven moisture along the sill after a storm - signs that the balance system, keepers, or weatherstrip has reached end of life in South Florida’s salt-air cycle.

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Which Therma-Tru Models This Applies To

Therma-Tru windows carry a series label on the top right corner of the sash interior and a date code stamped into the spacer bar visible through the glass edge. We work with Therma-Tru’s Classic-Craft, Fiber-Classic, and Profiles series, plus the newer Vented Sidelight units common in Boca Raton’s 2015-2022 builds. The critical compatibility gotcha: Therma-Tru switched from a 3/4-inch frame depth to 7/8-inch on impact-rated units after 2019, and the old hardware does not transfer. If your label reads “TT-IMP” followed by a four-digit code beginning with 19 or higher, you need the deeper jamb clip.

For replacement decisions, OEM Therma-Tru parts ship from Ohio with a 10-14 day lead time. We stock quality aftermarket equivalents manufactured to the same extrusion tolerances - the difference is the laser-etched logo, not the polymer formulation. On warranty jobs where the original purchase documentation exists, we order OEM. On out-of-warranty replacements, the aftermarket unit performs identically in our documented photo records.

Signs Your Therma-Tru Window Installation Is Failing

• Sash drops or won’t stay raised. The coil balance system has lost tension. In Boca Raton’s humidity, the balance shoe polymer degrades faster than the manufacturer rates it - we replace this with a stainless-steel shoe rated for coastal environments.
• Lock tongue misses the keeper by an eighth-inch or more. The sash has sagged in the frame, usually from a cracked corner key or thermal bowing of the vinyl jamb liner. This gap admits wind-driven rain during our summer storms.
• Visible moisture between glass panes. The Therma-Tru spacer bar seal has failed. Once argon escapes and ambient air enters, the Low-E coating begins oxidizing at the edge. In Florida sun, this spreads inward faster than in northern climates.
• Weatherstrip pulls away or turns powdery. The bulb seal has exceeded its UV exposure rating. We see this prematurely on west-facing Therma-Tru units in Boca Raton’s Royal Palm Yacht & Country Club and Boca West properties where afternoon exposure is extreme.
• Frame corner weeps water into the wall cavity. The sill pan flashing was omitted or the weep holes are blocked with debris. This is installation failure, not product failure, but the window must come out to remediate.

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After

Replacement Cost & What’s Included

What drives the range: frame material (vinyl vs. fiberglass composite), glass package (single-pane replacement vs. impact-rated laminated), and whether the rough opening needs reframing for current Florida Building Code wind-load requirements. Our measured survey - the document you keep - lists every line item before work starts. The written quote and the final invoice are the same document. Haven Clause 1. Every Therma-Tru installation carries our 365-Day Done Right Promise and leaves a documented photo record.

DIY or Call Us?

An owner can safely check the label location, photograph the failed component, and clear weep holes with a pipe cleaner. What goes wrong past that: Therma-Tru impact-rated sashes weigh 40-60 pounds depending on glass package, and the balance system stores significant spring tension. A released balance coil can strike with force sufficient to fracture the glass or lacerate a hand. We do not recommend homeowner removal of sashes or balance hardware.

We also see misordered parts weekly - a 3/4-inch jamb clip forced into a 7/8-inch frame cracks the vinyl within months. Measure it twice, write it down, then we can talk price. Call (561) 200-8592 and we’ll schedule a measured survey. The document is yours to keep, whether we do the work or not.

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