Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Before
After
Before
After
Before
AfterTherma-Tru Window Replacement: The Fort Myers Owner’s Guide
Therma-Tru window replacement in Fort Myers typically runs $180-$340 installed for sashes, balances, and hardware, while full-frame replacements land between $900 and $2,400 depending on size and impact rating. We stock Therma-Tru-compatible window parts on our trucks and can usually complete a sash or balance swap the same day we assess it. Most Fort Myers homeowners discover the failure when a window suddenly drops shut, won’t stay open, or starts leaking air during our afternoon thunderstorms.
Therma-Tru built its reputation on fiberglass entry doors, but their window lines share the same design philosophy: tight seals, durable hardware, and components meant to handle real weather. When one part fails, the whole window’s performance suffers. That’s the part we replace, not just patch.
Which Therma-Tru Models This Applies To
Therma-Tru’s window lineup spans several series, and the replacement part you need depends on which one you have. The most common lines we service in Fort Myers include the Benchmark, Classic-Craft, and Signature series windows, each with distinct balance systems and sash profiles. A Benchmark sash won’t fit a Signature frame even when the glass dimensions match. Check the corner of the sash or the edge of the frame for an etched or printed label showing the series name and manufacturing date. That label is the fastest way to match the right replacement.
For most Therma-Tru windows, we recommend OEM parts when they’re available. The balances are calibrated to specific sash weights, and a generic aftermarket balance often drags or slams. That said, for older Therma-Tru windows where OEM production has ended, quality aftermarket equivalents from Caldwell or Amesbury work reliably when sized correctly. A Fort Myers-specific gotcha: our humidity and salt air corrode coil spring balances faster than inland climates. If your home sits west of US-41 near the river or canal, expect to replace balances more often than a homeowner off Daniels Parkway.
Winslow Windows & Doors is an independent service provider, not affiliated with Therma-Tru. We’re simply a local Fort Myers company that’s been installing and repairing their products since 2011, and we know which parts actually hold up here.
Signs Your Therma-Tru Window Replacement Is Failing
- The window slams shut when you let go. The balances have lost tension or the shoes have cracked. This is the most common Therma-Tru window failure we see in Fort Myers, especially on south-facing windows where heat accelerates spring fatigue.
- The sash doesn’t seal evenly at the sill. A worn or broken balance tilts the sash in the frame, leaving a gap that air conditioning pours through from May through October. Your electric bill notices before you do.
- Locking hardware won’t align. When the latch no longer meets the keeper cleanly, the sash has shifted. The lock isn’t broken; the replacement parts underneath it are.
- You feel a draft even when the window is closed. Failed weatherstripping or a sash that’s dropped a quarter inch will leak conditioned air. In July, the humidity creeps in and you can feel it on the glass.
- The window tips out of the frame when you tilt it to clean. Pivot bars and shoe assemblies wear out, particularly on windows that get cleaned frequently or have been through a few hurricane seasons.
Replacement Cost & What’s Included
In Fort Myers, plan on these installed ranges:
- Balance replacement (pair): $180-$260
- Sash replacement (insulated glass unit): $340-$680
- Pivot bar and shoe kit: $150-$220
- Full-frame window replacement with new Therma-Tru or compatible unit: $900-$2,400
The spread comes from sash size, glass package, and whether you need impact-rated glazing. Our price includes the parts, labor, disposal of the old component, and a written line-item quote before we start. You won’t get a change order after the fact. Every replacement we install is backed by our 36500-Day Done Right Promise: if it’s not done right, Ed Winslow’s name is on it, and we make it right. Period.
DIY or Call Us?
What you can do safely: read the label on your sash, measure the visible glass dimensions, and note whether your window tilts in or slides side to side. That information helps us bring the right part on the first trip. What we wouldn’t try yourself: removing a sash with a loaded balance still attached. Those balances are under spring tension and can snap back hard enough to crack the frame or catch a finger. The replacement is quick for someone who does it weekly, and genuinely risky for someone doing it on a Saturday morning.
If you’re in a home off McGregor Boulevard or out toward Gateway and you’ve got a Therma-Tru window that’s giving up, call (239) 453-7751. We’ll come take a look, quote you a number, and fix it right the first time.
FAQs
With proper care, Therma-Tru windows last 15-20 years in Fort Myers, though balances and weatherstripping usually need replacement around the 10-12 year mark. Our salt air and intense UV exposure shorten hardware life compared to northern climates, so expect to swap balances at least once in the life of the window. Call (239) 453-7751 and we’ll assess yours for free.
In most cases, no. Balances, pivot bars, and shoes are wear parts that fail due to spring fatigue or material breakdown, and repair attempts usually last only a few months before failing again. Replacement is the honest fix. If you’re unsure whether yours can be saved, call (239) 453-7751 for a straight answer.
Most sash, balance, and hardware replacements take 45-90 minutes per window once we’re on site. Full-frame replacements take half a day to a full day depending on the opening. We’ll give you a time estimate before we start.
Our Fort Myers trucks carry common Therma-Tru balances, pivot bars, shoes, and hardware, so many replacements can be done on the first visit. For less common sash sizes or specific series components, we order directly and typically have the part within a few business days. We also stock compatible parts for PGT, CGI, and CWS windows if you have other brands in the house.
Written by Ed Winslow, Owner, Winslow Windows & Doors at Winslow Windows & Doors, serving Fort Myers and nearby areas.
Six Reasons Homeowners Choose Winslow Windows & Doors
Impact systems engineered to design pressures up to +/-100, matched to your wind zone - your openings hold when the storm arrives.
Low-E insulated impact glass from our manufacturer lines commonly cuts monthly cooling bills 20-30%.
Laminated impact glass shuts out up to 40% of outside noise - traffic, neighbors, weather.
Monitoring services run $30-90 a month. Laminated impact glass resists forced entry around the clock, with no subscription.
Florida homeowners average around 25% savings on the windstorm portion of their policy after protecting every opening - some homes qualify for more.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.