Therma-Tru Window Replacement Nationwide | Winslow Windows & Doors

Therma-Tru Window Replacement in Westchester: What to Know First

Therma-Tru window replacement in Westchester typically runs between $650 and $1,400 per window depending on the series, frame condition, and whether you’re doing a full-frame replacement or an insert. Most of our Therma-Tru jobs are completed in one day, and we’re an independent Therma-Tru service provider - that means we’re not tied to a manufacturer’s script when it comes to recommending what your house actually needs. If you own a Therma-Tru window and it’s fogged, binding, or leaking air around the frame, call (850) 721-1218 and Ed Winslow will give you a straight answer about whether it’s a repair or a replacement. This page is for Westchester homeowners who want to know what’s really going on with their Therma-Tru windows before they spend money.

Call (850) 721-1218

How Therma-Tru Products Fail - and How We Fix Them

Therma-Tru built its name on entry doors, but plenty of Westchester homes have their windows too. Here’s what we actually see when those windows start to fail:

• Therma-Tru 900 Series sash balance failures. The 900 Series uses a block-and-tackle balance system that’s smooth when new but wears out fast under Westchester’s humidity and salt air. When the balance gives out, the sash won’t stay up or slams shut. We replace the balance with a heavier-gauge aftermarket unit that outlasts the original by years.
• Sightline vinyl window corner-weld separations. The Sightline line from Therma-Tru was positioned as an affordable entry point, but the welded vinyl corners are a known weak point in direct afternoon sun. Once a corner separates, the sash loses its seal and starts letting water into the track. We fix this by replacing the sash or the entire unit with a full-frame swap, depending on how far the frame has moved.
• Therma-Tru casement window operator gears stripping. The casement hardware on older Therma-Tru units uses a plastic gear that strips after years of cranking against hardened weatherstripping. The window won’t close tight, and you feel the handle slip. We replace the operator assembly and reset the track alignment so the new gear isn’t fighting the sash.
• Glazing failures on Therma-Tru impact-rated units. We’ve seen Therma-Tru impact glass lose its seal faster than other manufacturers when the glazing bead was installed without a proper moisture barrier. The telltale sign is condensation between the panes that never clears. Once the argon’s gone, the energy rating’s gone too. We replace the insulated glass unit and re-bead it with a sealant that handles South Florida humidity.
• Frame rot on older Therma-Tru wood-composite windows near sprinkler lines. Westchester’s irrigation systems throw water at the same exterior wall every morning, and Therma-Tru’s older wood-composite frames absorb it. If we catch it early, it’s a sill replacement and re-flashing. If it’s spread, it’s a full-frame replacement with a vinyl or impact-rated Therma-Tru unit that won’t rot.

Our Therma-Tru Window Replacement Process

Here’s how a Therma-Tru replacement goes when you call Winslow Windows & Doors:

1. 1
   You call (850) 721-1218 and a live person answers. You tell us what the window’s doing. We ask about the age of the unit and which series it is if you know it.
2. 2
   Ed or one of our background-checked techs comes out to measure. We check the frame, the flashing, the reveal, and the condition of the surrounding stucco or siding. A Therma-Tru job gets extra attention at the sill because that’s where the brand’s older lines fail most often in Westchester.
3. 3
   We give you a written line-item quote. You’ll see the parts cost, labor, and disposal separately. No vague “window replacement” line, no change orders after we start.
4. 4
   We source the parts. If an OEM Therma-Tru part is available and makes sense for your budget, we use it. If the OEM part is backordered or known to fail again, we recommend a better aftermarket option and explain why before we order anything.
5. 5
   We install, test, and clean up. The new window goes in square, gets shimmed properly, insulated, and trimmed out. We cycle it a dozen times, check the seal with a smoke pencil, and run water on the exterior to confirm the flashing’s doing its job.
6. 6
   You get the Done Right Promise in writing. If it’s not done right, we come back and make it right. That’s Ed’s name on the truck, and his name on your job.

What Therma-Tru Window Replacement Costs in Westchester

Here’s what we typically quote in Westchester for Therma-Tru work:

• Insert replacement (existing frame in good shape): $650 to $950 per window, including the new sash, balance hardware, and interior trim.
• Full-frame replacement (frame rotted, moved, or improperly flashed): $1,100 to $1,400 per window, including tear-out, new flashing, exterior trim, and stucco repair where needed.
• Impact-rated Therma-Tru replacement: $1,200 to $1,800 per window depending on size and the level of impact rating required for your Westchester opening.

What moves the price? Whether the frame is salvageable, whether the window is a standard size or a custom geometric, and whether we’re matching an existing Therma-Tru finish or starting fresh. Call (850) 721-1218 for a free estimate with real numbers, not a range you have to guess at.

Why Westchester Homeowners Call Winslow Windows & Doors for Therma-Tru Work

Ed Winslow grew up in Westchester, just a few minutes from Tropical Park, and he learned building science at Miami Dade College’s Wolfson Campus before spending nearly two decades measuring and installing windows across this neighborhood. His dad was a general contractor, so Ed was on job sites before he ever sat in a classroom. That background means two things: first, he can spot a Therma-Tru failure mode from the curb, and second, he’s not going to sell you a replacement when a repair is the honest call. If a Therma-Tru window has failed and you’re weighing a different brand, we also install PGT, CGI, CWS, and ES Windows - and we’ll tell you straight which one makes sense for your house. My name is on the truck. That means I stand behind every window and door we touch. Every job comes with the Done Right Promise, a published address, and a license number you can verify. You call, a person answers, and you know exactly who’s coming to your door.

FAQs