Therma-Tru Window Replacement Nationwide | Sightline Windows & Doors Weston

Therma-Tru Window Replacement: The Weston Owner’s Guide

Therma-Tru window replacement in Weston typically runs $340 to $780 per opening installed, depending on the series, glazing package, and whether the frame needs re-squaring after removal. We stock Therma-Tru-compatible sashes, balances, and hardware for the Classic-Craft, Fiber-Classic, and Pulse series on our Weston-based trucks, and most replacements can be surveyed and priced same-day. You’ll usually know the part has failed when the sash drops, the lock won’t engage across both keepers, or you feel a draft along the sill even with the window fully closed.

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Which Therma-Tru Models This Applies To

Therma-Tru’s window lineup breaks into three main series we see in Weston homes, and the replacement parts are not cross-compatible between them. Classic-Craft uses a heavier, wood-edge construction with proprietary balances rated for 28 to 36 pounds per sash; Fiber-Classic shifts to a composite frame with a different keeper spacing, typically 3-15/16 inches center-to-center on double-hungs; Pulse, the newer entry-level line, runs a lighter vinyl-clad frame with snap-in glazing beads that crack if you pry them cold. The label you need is inside the head jamb, stamped with a 12-digit SKU starting with TTW or FCC - take a photo before calling, because Therma-Tru has revised the balance shoe design twice since 2018 and the old and new shoes look identical until you try to seat them.

We carry both OEM Therma-Tru balances and hardware plus aftermarket equivalents from Amesbury and Caldwell where the spec matches. For Classic-Craft and Fiber-Craft, we default to OEM; the tolerances on the pivot bar engagement are tight enough that a 1/32-inch variance will chatter. On Pulse, the aftermarket balance often outlasts the original, so we quote both and let the owner decide.

Signs Your Therma-Tru Window Replacement Is Failing

• Sash drops or won’t stay open. The coil balance has lost tension, usually from a cracked drum or corrosion on the sash cord. In Weston, we see this accelerate on east-facing windows where morning condensation sits on the sill track until 10 a.m.
• Lock won’t draw the sashes together tight. The keeper has wallowed out its screw holes, or the cam has worn flat. On Therma-Tru double-hungs, this often starts as a 1/8-inch gap at the check rail and grows until the weatherstrip no longer compresses.
• Draft at the sill or jambs. The bulb seal has compressed past recovery, or the frame has racked slightly and the sash no longer rides plumb. Weston homes near the Weston Town Center corridor, where the fill is older and settles in cycles, show this pattern more than newer construction on the west side.
• Condensation between panes. The insulated glass unit (IGU) has lost its seal. Therma-Tru uses a stainless steel spacer on Classic-Craft and a composite spacer on Pulse; the stainless fails slower, but neither survives a summer of south Florida UV once the primary seal goes.
• Cracked or yellowed glazing bead. The vinyl has embrittled. On Pulse series, this is almost always the snap-in bead at the exterior, which shrinks in the heat and pulls away from the glass edge, letting water track behind it during our September storm peaks.

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Replacement Cost & What’s Included

The range reflects three variables: the series (Classic-Craft parts cost more), the glazing spec (impact-rated laminated glass adds roughly $180 per sash in Weston due to Miami-Dade NOA requirements), and whether the frame has shifted since original install. We price each opening individually during the measured survey - the document you keep - and that written price is the invoice. No change orders. The 365-Day Done Right Promise covers the installation and hardware; the glass itself carries the manufacturer’s warranty, which we register for you.

DIY or Call Us?

There’s a safe middle ground here, and then there’s the point where you hand it off. An owner can check the label in the head jamb, photograph the failed part, and verify the lock keeper spacing with a tape measure - all useful, all zero risk. What we don’t recommend is removing a sash with a failed coil balance unassisted. The balance is under tension, and if the pivot bar slips while you’re working it free, the sash can drop hard on your hand or the frame edge. We’ve replaced enough sashes in Weston where the real damage started with a dropped window, not the original failure.

Same for IGU replacement: the glass is heavy, the glazing points are sharp, and a Therma-Tru frame that’s been in south Florida sun for six years will have vinyl that snaps rather than flexes. If you want to verify the failure, hold a lighter near the glass edge and watch the flame - a failed seal pulls air through. Then call us to swap it. Measure it right the first time. The window does not care how confident you were.

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