Therma-Tru Window Replacement Nationwide | Winslow Windows & Doors

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

Therma-Tru window replacement in Westchester typically runs $450 to $1,800 installed per window, depending on the series, glass package, and whether the frame itself needs rebuilding. We stock common Therma-Tru hardware, sashes, and glass units on our trucks, so most Westchester replacements happen same-day once we confirm your measurements. Most owners find out something’s wrong when a window won’t latch, the glass fogs between panes, or a crank spins without moving the sash. Ed Winslow has seen it plenty of times in Westchester homes, especially the older ranches off Bird Road where original Therma-Tru units have logged fifteen-plus Florida summers.

Call (863) 251-5864

Which Therma-Tru Models This Applies To

Therma-Tru builds several window lines, and the replacement approach differs by series. The Classic-Craft and SlimLine series are common in Westchester homes, and each uses slightly different sash profiles and hardware spacing. Here’s the compatibility gotcha we run into constantly: Therma-Tru embeds a product ID on a sticker inside the frame channel, usually on the top or left side of the sash. If that sticker is gone, you need the glass dimensions and the sash thickness to match the correct part. Guessing based on a photo of the outside trim rarely works.

On the OEM versus aftermarket question, our honest take: OEM Therma-Tru parts are worth it for seals, weatherstripping, and sash locks where tolerances matter. Quality aftermarket equivalents exist for balances and shoe springs, and we use them when they genuinely match spec. We’re an independent service provider, not affiliated with Therma-Tru, so we choose parts based on what will last in Westchester’s salt-tinged air and afternoon thunderstorms, not on a brand requirement. We also stock parts for PGT, CGI, and CWS windows, which helps when a Westchester home has mixed brands across different rooms.

Signs Your Therma-Tru Window Replacement Is Failing

• Fog or haze between the glass panes. The seal on the insulated glass unit has failed, and Florida humidity is now condensing inside. This is not cleanable. The glass unit gets swapped, not the whole whole frame.
• The sash won’t stay up or drops hard. The balance shoes or spring mechanisms have worn out. Therma-Tru sashes are heavier than people expect, and a failing balance is not just annoying, it’s a finger-pinch waiting to happen.
• You can hear more street noise than you used to. Weatherstripping has compressed or the sash is no longer seating tight. Westchester’s traffic off the Palmetto makes this noticeable within a week of failure.
• The crank turns but the window barely moves. The gearbox inside the operator is stripped. This is especially common on casement and awning styles that get opened daily for the sea breeze.
• Visible rot or softness at the sill corners. Water has been getting past the seal. In Westchester’s rainy season, this spreads fast, and it usually means you need more than just a part, you need the sill rebuilt before a new sash goes in.

Replacement Cost & What’s Included

In Westchester, here’s what we typically see for installed Therma-Tru window replacements:

• Glass unit only (seal failure): $250-$550 per window
• Sash replacement (hardware issue): $400-$900 per window
• Full unit replacement (frame damaged): $900-$1,800 per window

What moves the price: window size, glass package, whether the frame needs rebuilding, and how many windows you’re doing at once. Every estimate we give in Westchester is a written line-item quote, upfront. No change orders down the road. The labor, the part, the cleanup, the haul-away, it’s all on the page before you say yes. And everything we install is covered by our 36500-Day Done Right Promise. If it’s not done right, Ed makes it right, period.

DIY or Call Us?

You can safely check a few things yourself: whether the window is square in the opening, whether the weep holes are clogged with dirt, whether the caulking around the exterior frame is cracked. That’s diagnosis. The actual replacement work on a Therma-Tru window involves tensioned balances, sharp glass edges, and sashes that weigh more than they look like they should. A sash that drops while you’re working on it can break a finger or worse. We’ve fixed enough DIY attempts in Westchester to say this plainly: the money saved rarely covers the repair. If you’d rather have it done right the first time, call (863) 251-5864. We’ll send a technician who does this every week, not someone who watched a video and guessed.

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