Therma-Tru Window Installation Nationwide | Meridian Windows & Doors

Therma-Tru Window Installation: The Los Angeles Owner’s Guide

Therma-Tru window installation in Los Angeles typically runs $80 – $220 per window for labor, with most full-frame replacements on Therma-Tru units landing between $450 and $900 installed depending on size, series, and what we find when the old unit comes out. We stock common Therma-Tru window components on the truck and can handle most installations within one visit. Most Los Angeles homeowners discover they need us when a window that used to close tightly suddenly leaves a gap at the sill, or when the sash feels heavier than it did six months ago. That’s usually not the glass, it’s the installation hardware and weather-sealing system around it.

Call (817) 686-2228

Which Therma-Tru Models This Applies To

Our crews install across the Therma-Tru window series you’re most likely to have in a Los Angeles home built or renovated in the last 20 years: the Classic-Craft, Slim-Line, and Signature series show up most often in the San Fernando Valley and on the westside. The part you need depends on which series and vintage you have, because Therma-Tru changed balance-tube diameters and shoe profiles between production runs. We identify your window by the label on the top edge of the sash or the inner jamb, and by measuring the glass thickness and frame depth, not by guessing from a photo. If the label is gone, we match the balance shoe and pivot bar against our stock on the truck. For owners who ask about OEM versus aftermarket: we install both, but for moving parts like balances and tilt latches we recommend OEM Therma-Tru where available, because the tolerances on the shoe-to-tube fit are tighter than the aftermarket equivalents, and a loose fit is exactly what causes a window to drop. Meridian Windows & Doors is an independent installer; we’re not affiliated with Therma-Tru, but we’ve worked with their product lines long enough to know which parts interchange and which don’t.

Signs Your Therma-Tru Window Installation Is Failing

• The sash won’t stay up. This is almost always a failed balance tube or a worn shoe. In coastal Los Angeles, salt air accelerates the wear on the internal spring; in the Valley, heat does it. Either way, it stops holding tension and the window drops.
• Drafts at the sill or jamb. The weatherstripping has compressed beyond recovery. Los Angeles sees long dry stretches that bake the vinyl and rubber, then sudden rain. A compressed seal lets both heat and water in.
• The window sticks or binds when you crank it. On casement windows, the operator gear wears first. Forcing it strips the teeth, and then the crank spins freely without moving the sash.
• Condensation between the panes. The insulated glass unit seal has failed. That’s not repairable in the field; the sash needs a new IGU. We see this most in west-facing windows in Los Angeles where afternoon sun stress is constant.
• Visible gaps where the frame meets the siding. The installation caulk and flashing have deteriorated. A gap there isn’t a product failure, it’s an installation failure from the last crew. We undo those on a regular basis and re-flash properly.

Replacement Cost & What’s Included

For most single Therma-Tru window installations in Los Angeles, you’re looking at $80 – $220 in labor per window. Add the part: balances run $25 – $60 per pair, tilt latches $8 – $20, weatherstripping kits $15 – $40, and a full replacement sash with glass runs $150 – $350 depending on size and low-E coating. A common full job, say replacing a full-frame Therma-Tru window with a new insulated unit in a standard Los Angeles opening, lands between $450 and $900. The written price we hand you before work begins includes the part, labor, disposal of the old unit, and a full year of coverage under our 365-Day Done Right Promise. If it fails within that year, we come back at no charge and do it right.

DIY or Call Us?

You can safely check a few things before calling us: clean the tracks, look for an obvious broken shoelace-style balance cord, and look at whether the weatherstripping is cracked. What you shouldn’t do is try to replace a balance tube or manhandle a sash out of the frame. The newer Therma-Tru balance systems hold real tension, and when a clip lets go mid-removal it can take a chunk out of your hand or the window. We’ve undone enough botched DIY attempts around Los Angeles to know that a $60 part stops being a bargain when the jamb is gouged and the sash has to be re-ordered. Call (817) 686-2228 and we’ll send a uniformed technician with the right parts already on the truck.

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