Therma-Tru Window Replacement Nationwide | Sightline Windows & Doors West Palm Beach

Therma-Tru Window Replacement: The West Palm Beach Owner’s Guide

Therma-Tru window replacement in West Palm Beach typically runs $340-$780 per opening installed, depending on whether you’re swapping a standard double-hung or a full-frame impact-rated unit. We stock Therma-Tru-compatible sashes, frame kits, and hardware for same-day repair on most series, and we carry PGT, CGI, and CWS lines when the opening calls for a different performance tier. Most owners first notice the problem when a sash won’t stay open, condensation appears between panes, or the locking mechanism grinds instead of seating - signs that the balance system, insulated glass unit, or multi-point lock has reached its service limit in South Florida’s salt-air, high-UV environment.

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Which Therma-Tru Models This Applies To

Therma-Tru organizes its window portfolio by material and performance tier, and the part you need depends on which frame system was originally specified. The most common units we service in West Palm Beach are the Classic-Craft and Fiber-Classic collections with vinyl or fiberglass frames, typically paired with double-hung or casement sashes from the 2015-2022 production runs. The Profiles series, a builder-grade vinyl line common in developments west of I-95, uses a different balance shoe and sash cam than the premium lines - a frequent mismatch when homeowners order parts by brand alone.

To identify your unit, check the AAMA certification label on the sash edge or frame head; it lists the series code, U-factor, and DP (design pressure) rating. For the insulated glass unit itself, look for the etched corner mark showing the glass build date and Low-E coating spec. OEM Therma-Tru parts ship through their distribution network with a 7-14 day lead time; we stock quality aftermarket equivalents from C.R. Laurence and AmesburyTruth that match the original tolerances and carry the same 5-year material warranty. If the number isn’t on the page, it isn’t in the price.

Sightline Windows & Doors West Palm Beach is independently owned and operated and is not affiliated with Therma-Tru Corporation.

Signs Your Therma-Tru Window Replacement Is Failing

• Sash drops or won’t stay raised. The coil balance system has fatigued, typically after 8-12 years in West Palm Beach’s heat and humidity. The spring tension degrades faster here than in inland climates because thermal cycling is constant year-round.
• Fog or moisture between panes. The edge seal on the insulated glass unit (IGU) has failed, allowing humid Gulf Stream air to enter the airspace. Once the desiccant saturates, the view clouds permanently and the thermal performance drops measurably.
• Lock handle turns but doesn’t engage. The multi-point lock mechanism has worn at the cam or the keeper has shifted due to frame expansion. On Therma-Tru vinyl units, we see this most often on south-facing elevations where daily expansion cycles stress the hardware.
• Draft around the sash perimeter. The weatherstrip has compressed or the sash bulb seal has hardened. In coastal West Palm Beach, salt accumulation accelerates rubber degradation; the seal may look intact but no longer rebounds to fill the gap.
• Frame corner separation or sill rot. Water intrusion at the sill nose or jamb corner has compromised the substrate. On older Fiber-Classic units, the composite frame resists rot but the wood-reinforced sill can wick moisture if the end dams were not sealed at installation.

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Replacement Cost & What’s Included

These prices include the measured survey, the part, installation labor, and disposal of the old component. What drives the range: unit size, whether the opening requires impact-rated glazing per Palm Beach County code, and whether the frame is square within 1/8 inch - if not, we document the deviation and price the shim work before cutting anything. Haven Clause 1 governs every quote: the written price and the measured survey are the same document. No change orders. The 365-Day Done Right Promise covers the installation; manufacturer parts carry their own material warranty, which we register on your behalf.

DIY or Call Us?

There is one thing a homeowner can safely check: remove the sash and confirm the AAMA label is legible. That tells you the series, the original glass spec, and the date of manufacture. Everything after that benefits from a measured approach.

IGU replacement requires breaking the old glass, handling sharp edges, and sealing the new unit with butyl tape and setting blocks at precise clearances - get the standoff wrong and the glass cracks in the first heat cycle. Balance systems store significant spring tension; releasing it without a brake tool can damage the frame or cause injury. Multi-point locks must be adjusted to the exact keeper spacing; too tight and the mechanism binds, too loose and it doesn’t secure. We pull permits when required by Palm Beach County and document the finished work with photos you keep. For a part that affects your home’s weather seal and security, the cost of a failed DIY attempt usually exceeds the original installed price. Call (561) 354-3861 to schedule your free estimate.

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