Therma-Tru Window Replacement Nationwide | Sightline Windows & Doors Olympia Heights

Therma-Tru Window Replacement: The Olympia Heights Owner’s Guide

Therma-Tru window replacement in Olympia Heights typically runs $340-$780 per opening installed, depending on frame size, glazing specification, and whether the rough opening needs reframing. We stock Therma-Tru-compatible sashes, frame kits, and hardware for same-day replacement on most standard sizes, and we carry PGT and CGI alternatives when a full upgrade makes more sense. Most Olympia Heights owners first notice trouble when a sash won’t stay open, condensation appears between glass lites, or the lock no longer draws the sash tight against the weatherstrip - signs that the unit has reached the end of its serviceable life in South Florida’s salt air and UV load.

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Which Therma-Tru Models This Applies To

Therma-Tru window systems fall into several product families, and matching the right replacement part starts with the label. Look for the white adhesive label on the top edge of the sash or the vertical jamb - it carries the series code (commonly TTW-100, TTW-200, or TTW-300 for residential vinyl, and TTW-Alum for the aluminum-clad line), the manufacturing date, and the NFRC performance ratings. The date matters: Therma-Tru revised its sash interlock geometry in 2019, so a 2017 TTW-200 sash will not seat properly in a 2020 frame of the same nominal size. We verify this on site with a sightline gauge before ordering.

For glazing, Therma-Tru used Cardinal LoE-366 as standard from 2016 forward, but earlier units may carry LoE-272 or even clear dual-pane. The spacer bar color is another tell - black stainless versus silver aluminum indicates which insulated glass unit (IGU) specification was built in. We stock both OEM Therma-Tru replacement IGUs and quality aftermarket equivalents from CWS and ECO Window Systems that match the U-factor and SHGC ratings without the OEM lead time. The aftermarket route saves roughly $80-$140 per opening and carries the same 10-year glass warranty we write into every job.

Before

After

Signs Your Therma-Tru Window Replacement Is Failing

• The sash drifts or won’t hold position. This points to failed balance systems - either the constant-force coil spring (in older TTW-100 units) or the block-and-tackle balance (TTW-200 and later). In Olympia Heights, we see spring fatigue accelerate where windows face west and absorb afternoon heat buildup; the metal cycles through expansion and contraction daily.
• Fog or moisture between the glass panes. The edge seal on the IGU has failed, allowing humid South Florida air to enter the airspace. Once the desiccant in the spacer bar saturates, the fogging becomes permanent. This is not a cleanable surface issue; the glass unit requires replacement.
• Frame corners gap or separate. Vinyl frames in Therma-Tru’s earlier welded-corner construction can stress-crack at the weld line after years of thermal cycling. We measure the corner squareness - anything beyond 1/16 inch out of square means the frame is structurally compromised and will leak air and water.
• Lock hardware operates but doesn’t pull the sash tight. The keep (strike plate) has worn or the cam has rounded off. More often, the sash itself has sagged, and the lock is trying to draw two misaligned planes together. We check with a feeler gauge; if the gap exceeds 3/16 inch at the lock side, the sash or frame is the problem, not the hardware.
• Water intrusion at the sill or jambs during heavy rain. The weep system is clogged, or the weatherstrip has compressed past recovery. In Olympia Heights, pollen and salt residue combine to block weep channels. We flush and verify drainage as part of every replacement, but persistent water at the interior sill usually means the frame drainage path was designed poorly or has degraded.

Replacement Cost & What’s Included

What drives the range: size (anything over 40 x 60 inches jumps to custom pricing), glazing specification (impact-rated laminated glass adds $120-$200 per opening), and the condition of the existing rough opening. We pull the interior trim, measure the rough opening ourselves, and document it in the written scope you keep - Haven Clause 1. The price we write is the price on the final invoice; our change-order count stays near zero because Sonia reads the opening before she quotes it, not after. Every replacement carries our 365-Day Done Right Promise and leaves a documented photo record of the completed work.

DIY or Call Us?

There is safe checking, and then there is work that belongs to a trained technician with the right tools.

An owner can verify the label location, photograph any visible damage for our review, and confirm the symptom - whether the issue is glass, frame, or hardware. What we do not recommend: removing a sash with failed balances (the sudden drop can injure fingers or damage the frame), cutting out an IGU without proper support (the remaining lite can shatter under uneven pressure), or attempting to re-square a vinyl frame with heat guns (distortion voids any remaining warranty and warps sightlines permanently).

We are an independent service provider - not affiliated with Therma-Tru - and we stock the gauges, replacement balances, and frame-specific hardware that box stores do not carry. Call (786) 400-2761 to schedule your free estimate. We’ll measure, photograph, and write the scope while you watch.

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