Therma-Tru Window Replacement Nationwide | TruePane Windows & Doors

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

We replace failed Therma-Tru window units across Delray Beach, and most full-unit replacements run between $750 and $1,800 installed, depending on size, glass package, and whether the frame itself is still sound. We stock common Therma-Tru glass sizes on the truck, and we can typically get a matching replacement in your opening within five to seven business days. The call usually starts the same way: you notice condensation between the panes that will not wipe off, or the window no longer locks square against the frame after years of Florida humidity working on the sash.

Call (561) 940-2917

Therma-Tru built its name on entry doors, but plenty of Delray Beach homes went in with their matching window lines, and twenty years of salt air and monsoon-season moisture eventually catches up with every seal. Here is what you need to know before you spend a dollar.

Which Therma-Tru Models This Applies To

Therma-Tru window compatibility is not guesswork, and we will not treat it that way. The brand’s residential lines most common in Delray Beach include the SlimLine, the 300 Series, and the TrueVue architectural series, each with different glass-to-frame dimensions and sash profiles. The fastest way to identify your unit is the label etched into the corner of the glass, or the sticker on the inside of the frame, which carries the series code and the IGCC certification number. If that label has long since faded, our technicians measure the visible glass opening, the frame depth, and the sash thickness before we order anything.

One compatibility gotcha specific to Therma-Tru: the TrueVue series uses a 1-3/8 inch insulated glass unit, where the SlimLine and 300 Series more often use a 3/4 inch to 1 inch unit. Order the thicker glass for a SlimLine frame and the sash will not seat, and the locks will bind. We have corrected that mistake for more than a few Delray Beach homeowners who bought glass from a big-box store and found their window would not close by August. For most circumstances, we recommend an OEM or OEM-spec replacement, particularly where the window carries a transferable warranty; quality aftermarket equivalents make sense when the original line is discontinued and the seal failure is isolated to the glass.

Signs Your Therma-Tru Window Replacement Is Failing

• Fogging or condensation between the panes. This is the classic failed-seal symptom, and in Delray Beach’s humidity it shows up faster than in drier climates. The desiccant inside the spacer has saturated, and no amount of wiping will clear it.
• The sash sags or scrapes when you open and close it. Therma-Tru sashes rely on balanced hinge hardware and a square frame. When the frame shifts or the hardware wears, the window begins to bind at the top or bottom, and forcing it makes the problem permanent.
• Drafts you can feel on a still day, especially near the corners of the sash. Weatherstripping on Therma-Tru windows is a wear item, and so is the glazing bead. A draft means the compression seal has flattened or the bead has pulled away from the glass.
• The lock no longer engages, or engages only with force. Misalignment is the cause, and it often follows years of thermal expansion and contraction. Adjusting the hardware only masks the real issue if the frame is out of square.
• Visible cracks in the frame or glazing bead, particularly on the west-facing elevation. South Florida UV is unforgiving, and older Therma-Tru vinyl and composite components can get brittle with enough sun exposure. Once the bead cracks, moisture gets into the frame channel and accelerates every other problem on this list.

Replacement Cost & What’s Included

A straight glass replacement for a smaller Therma-Tru unit in Delray Beach will usually land between $350 and $600 installed, while a complete sash or full-frame replacement runs higher because you are paying for the new frame material, the labor to set it square, and the finish work. A full Therma-Tru window replacement in a standard opening typically runs $750 to $1,800 installed. Impact-rated glass, which many Delray Beach homeowners choose for the building code and insurance credit, sits at the top of that range, and for good reason.

What you get with us is a line-item quote before we start, with the part, the labor, and the disposal broken out separately. We register the manufacturer warranty in writing before the truck leaves your driveway, which is part of The Keystone Standard on every job. We are an independent service provider, not affiliated with Therma-Tru, which means we are free to tell you the truth about which parts actually hold up. Our workmanship is covered by our Done Right Promise: if it is not done right, we make it right, no paperwork fight.

DIY or Call Us?

Replacing a Therma-Tru glass unit inside a vinyl or composite sash involves removing the glazing bead, setting the new unit with proper setting blocks, and re-seating the bead without stressing the frame. It is not high-danger work like garage springs, but it is exacting, and a small mistake in the setting block placement means the glass will eventually crack from its own weight. You can safely check the label, measure the visible glass, and photograph the lock and hinge hardware; do not remove the sash from the frame unless you know how it comes out without bending the hinge channel.

If you have done this work before and have the right flat bars and glazing tools, aftermarket glass on a discontinued series may work for you. If this is your first Therma-Tru repair, or if the frame shows any sag, the money you save doing it yourself can evaporate the first time the lock will not engage. Call (561) 940-2917 and we will measure it, quote it on paper, and set it true the first visit.

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