Therma-Tru Window Replacement Nationwide | Hale Windows & Doors

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

Replacing a Therma-Tru window in Los Angeles typically runs between $450 and $1,200 per window installed, depending on the series, glass package, and what we find when the old unit comes out. We stock the most common Therma-Tru compatible replacement sashes, insulated glass units, and hardware on our trucks, and most single-window swaps are completed the same visit. You’ll usually know something is wrong the first cool night of the season: a draft you can feel from across the room, a sash that suddenly takes two hands to lift, or condensation fog between the panes that no longer clears when the sun hits it.

Call (252) 675-6980

Hale Windows & Doors is an independent window and door company serving Los Angeles, not affiliated with Therma-Tru. That independence means we match the replacement to your specific Therma-Tru model rather than defaulting to one brand’s line card.

Which Therma-Tru Models This Applies To

Therma-Tru built its name on doors, but the brand has produced window lines and integrated door-and-sidelight units where the glass package shares hardware and sizing specs across several series. The compatibility gotcha most Los Angeles homeowners run into is this: Therma-Tru door units with built-in glass panels often use a proprietary glazing bead profile that looks standard from the front but measures differently once you pop the trim. An off-the-shelf insulated glass unit from a big-box supplier will fit the rough opening but not the bead channel, which is why we measure the bead channel, not just the glass-to-glass dimensions, before ordering.

In practice, most Therma-Tru window replacements we handle in Los Angeles fall into three buckets: replacement insulated glass for fogged or failed seals in door sidelights and transoms, full replacement sashes in Therma-Tru window lines, and hardware swaps on casement and awning crank assemblies. We ask owners to send a photo of the label on the edge of the glass or the hinge side of the frame; if the label is painted over or gone, we measure the bead channel, the daylight opening, and the glass thickness to match OEM specifications. For hardware, Therma-Tru uses a mix of Truth Hardware and All-WEATHER components on different series, and the aftermarket equivalents from Truth are functionally identical; we stock both and skip the no-name imports.

Signs Your Therma-Tru Window Replacement Is Failing

• Condensation between the panes that never clears. The seal has failed and argon or krypton has leaked out. The thermal performance is degraded by roughly a third once the gas escapes, and the fog only gets worse. This is the number one reason Los Angeles homeowners call us, usually after the first rainy stretch makes the fog impossible to ignore.
• Sash feels heavy or drops when you release it. On double-hung Therma-Tru units, the constant-force balance system loses tension over time, especially in coastal Los Angeles air where salt corrosion in Playa del Rey and San Pedro accelerates metal fatigue. The window still closes, but it’s working you harder than it should.
• A draft you can feel even when the sash is locked. Weatherstripping compresses, and after years of direct Los Angeles sun, the gasket material turns brittle and stops springing back. You’re not imagining it; a dollar bill slipped between the sash and frame will slide out clean on a worn seal.
• Casement crank spins without moving the sash, or grinds. The gear inside the operator is stripped, which happens on Therma-Tru units in the 8 to 12 year range when the crank gets forced against warped weatherstripping. The window mechanism needs an operator replacement, not a spray of lubricant.
• Visible moisture or mildew inside the frame channel. A failed gasket or clogged weep hole is holding water against the wood or composite frame, and in older Los Angeles homes with original framing, that standing moisture accelerates rot where sill meets jamb. If you can see a dark stain in the lower channel, don’t wait.

Replacement Cost & What’s Included

For Los Angeles homeowners, plan on the following ranges for installed Therma-Tru window replacement work:

• Insulated glass unit replacement (seal failure, fogged glass) – $220 to $480 per pane installed, glass-only, depending on size, shape, and whether it carries a low-E coating (a thin metallic layer that blocks heat transfer while letting visible light through).
• Full replacement sash, double-hung – $380 to $620 per sash installed, including new balances and weatherstripping, matched to the existing frame.
• Casement or awning hardware replacement (crank, operator, hinge set) – $190 to $340 per window installed, using Truth or All-WEATHER OEM-spec hardware.
• Full window replacement of a Therma-Tru unit with a comparable professional-grade window – $700 to $1,400 per window for typical Los Angeles residential sizes, including removal of the old unit, framing correction if the rough opening has shifted, new installation with proper flashing, and trim work.

Our price is written down before the truck pulls up. We inspect, measure, and hand you a fixed line-item quote; the price on that paper is the price you pay, even if the job runs into a hidden shim or a twisted opening. Every repair carries a written guarantee, and our 365-Day Done Right Promise covers the workmanship: if the install is not right, we make it right at no charge, no argument. If a repair fails within the covered period, the second visit is free.

DIY or Call Us?

There are a few things you can check safely. Cleaning the weep holes at the bottom of the frame with a pipe cleaner or a bent paperclip is a legitimate DIY fix for standing water, and tightening visible screws on casement crank arms sometimes buys you a month. Replacing worn weatherstripping is also manageable if you can match the profile. What we’d warn against is pulling pressurized insulated glass yourself. Older Therma-Tru door sidelight units in Los Angeles carry tempered glass held under edge pressure, and one wrong pry against a corner can shatter the pane. Same with releasing a double-hung that still has tension on the balance; a constant-force coil under load can slice a hand. If the job involves glass removal, tensioned balances, or anything structural, call us at (252) 675-6980 and let a trained technician make the swap in an hour instead of a Saturday-and-a-trip-to-urgent-care.

FAQs