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 Installation: The Coral Gables Owner’s Guide
If you need a Therma-Tru window installed or an existing one replaced in Coral Gables, a complete installation typically runs between $850 and $2,400 per window depending on size, frame condition, and whether you’re going with an impact-rated unit. We stock Therma-Tru-compatible hardware and seals on our trucks, and most single-window swaps in Coral Gables are done in one visit. The way most homeowners find us: they notice a draft that wasn’t there last season, a sash that suddenly won’t stay up, or condensation fogging between the panes that won’t wipe away. That’s usually the moment the window tells you it’s done.
Therma-Tru earned its reputation in doors, but their window lines carry the same DNA: solid framing, clean sightlines, and hardware that’s built to be serviced rather than thrown away. We’re an independent installer, not a factory rep, and we’ve worked on enough Therma-Tru windows across Coral Gables to know exactly what holds up and what doesn’t in this climate.
Which Therma-Tru Models This Applies To
Therma-Tru’s window lineup splits into a few families, and the installation details differ enough that you want someone who’s actually touched them. The most common models we install in Coral Gables are the Classic-Craft, Fiber-Classic, and Slim-Line series. Each uses a different balance system and sill profile, so a part that fits a Classic-Craft will not necessarily seat correctly in a Fiber-Classic frame. That’s the most common compatibility gotcha we see: someone orders a replacement balance or tilt latch based on “looks right” and ends up with a sash that binds or drops.
To identify your window, check the label on the top edge of the sash or the inside jamb. It will list a series name and often a manufacturing date. On the decision between OEM and quality aftermarket: for Therma-Tru specifically, we recommend OEM or factory-equivalent balances and pivot bars every time. The tolerances are tight enough that a generic aftermarket part can cause the sash to sit slightly off-plane, which leads to premature weatherstripping wear. We’re an independent installer and we don’t push factory parts where aftermarket is genuinely equal; on Therma-Tru hardware, the factory-spec stuff is worth the small premium.
We also service and install PGT, CGI, and CWS windows, so if your home has a mix of brands, one call covers all of it.
Signs Your Therma-Tru Window Installation Is Failing
- Draft you can feel with the sash closed and locked. This usually means the weatherstripping has compressed beyond recovery or the frame has settled out of square. In Coral Gables, the salt air accelerates seal breakdown faster than inland locations.
- Sash that’s suddenly heavy or drops when you let go. The block-and-tackle or spiral balance has lost tension. This is a classic Therma-Tru service item after 8 to 12 years in Florida humidity, and it’s a repair that should be handled carefully by someone who knows the tension ratings.
- Condensation or haze between the glass panes. The insulated glass unit seal has failed. Once moisture gets between the panes, there’s no field repair that restores clarity; the unit needs replacement. You’ll see this most often on the west-facing windows in Coral Gables homes that catch afternoon sun year-round.
- Lock that won’t engage or a sash that won’t seat. Often a combination of worn tilt latches and a slightly warped sill. Forcing the lock can crack the keeper plate or damage the sash frame, which turns a $40 part into a full window replacement.
- Visible daylight at the frame corners when the sash is closed. This indicates the installation itself was never properly shimmed and squared, or the rough opening has shifted. Coral Gables’ older masonry homes settle over decades, and a window that was square in 2005 may not be in 2026.
Replacement Cost & What’s Included
In Coral Gables, expect these installed price ranges for Therma-Tru window work:
- Sash balance replacement (single window): $140-$280
- Weatherstripping and seal kit refresh: $95-$210
- Insulated glass unit replacement: $350-$750 per sash
- Full Therma-Tru window installation (standard size): $850-$1,800
- Full installation with impact-rated glass: $1,400-$2,400
Every quote includes the part, labor, haul-away of the old unit, and our written line-item pricing so you see exactly where the money goes. If a window is at the edge of repairable and we think replacement makes more sense, we’ll tell you straight and show you both numbers. No change orders, no surprise line on the final invoice. And every installation carries Ed Winslow’s Done Right Promise: if it’s not done right, we come back and make it right. That’s not a warranty card you mail in; it’s a commitment from a local owner whose address and license number are published for anyone to see.
DIY or Call Us?
Here’s the honest split. There are things you can safely check yourself: whether visible weatherstripping is torn or compressed, whether the weep holes at the bottom of the frame are clogged with dirt or paint, whether the lock hardware is visibly loose. Clearing weep holes with compressed air and tightening visible screws are reasonable homeowner tasks, and they occasionally solve a draft or a sticking sash.
What you should not attempt: removing and reinstalling a Therma-Tru sash, replacing balance springs, or pulling an insulated glass unit out of the frame. Those balances are under tension, and the glass units are heavy and sealed against the frame with structural silicone tape. A sash that comes loose at the wrong angle can take a chunk of your wall with it, and a dropped glass unit on a tile floor is a mess nobody wants. When you’re ready for a straight answer and a fixed price, call (904) 478-8983. Ed’s name is on the truck, and the person answering the phone is a live human being, any hour, any day.
FAQs
A properly installed Therma-Tru window in Coral Gables will typically last 20 to 30 years for the frame and hardware, while the insulated glass unit often needs replacement at the 10 to 15 year mark due to seal failure from heat and salt exposure. The frame is fiberglass or composite, which resists the rot and termite issues that eat wood windows in this climate. Call (904) 478-8983 if you’re seeing seal failure before year 10, and we’ll assess whether it’s an installation issue or a factory defect.
Yes, and more often than you’d think. Balance systems, tilt latches, weatherstripping, and even the insulated glass unit are all replaceable components on most Therma-Tru models. Replacement only becomes the smart choice when the frame itself is cracked, the rough opening has shifted significantly, or the cost of repairs approaches 60% of a new unit. We’ll show you both numbers and let you decide with full information.
A single-window swap in Coral Gables takes two to four hours from arrival to clean-up. If you’re replacing multiple windows on the same elevation, plan on one full day for every two to three windows, assuming no hidden frame damage. We carry the common Therma-Tru parts on the truck, so most jobs finish in a single visit without a “waiting on parts” delay.
We keep the fast-moving Therma-Tru service parts on our trucks: balances, pivot bars, tilt latches, lock assemblies, and common weatherstripping profiles for the Classic-Craft, Fiber-Classic, and Slim-Line series. Less common parts, like factory-color-matched sashes or oversized insulated glass units, are ordered and typically arrive within five to seven business days. Call (904) 478-8983 and we’ll tell you straight whether we have your part on hand or what the honest lead time is.
Dealing with a Therma-Tru window that’s not holding up in Coral Gables? Call (904) 478-8983 for a free estimate. We’ll give you an upfront price, a written line-item quote, and a straight answer about whether it’s a repair or a replacement. Locally owned by Ed Winslow since 2011, with a live person answering the phone 24/7 and the Done Right Promise on every job. The one down the road.
Written by Ed Winslow, Owner, Winslow Windows & Doors at Winslow Windows & Doors, serving Coral Gables 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.