New windows and doors improve comfort, cut energy bills and add long-term value to your home. Westlight Windows Orange County pairs proven product lines with our own installing crews for lasting performance - and a price we put in writing.
Choose your installer
The unit is half the job - the install is the other half. Our own background-checked crews measure, set, seal and insulate every opening, and they know the lines we quote inside and out because they install them every week.
Select the right products
Compare styles, materials and glass packages side by side until the fit is right for your rooms, your budget and your goals. The product-line comparison below is the place to start.
Prepare your home for install
Before install day we walk you through a short checklist - furniture pulled back, treatments down, a clear path to each opening - so install day is watch-it-happen, not scramble.
Compare the Lines We Quote
Every project is priced on the same lines, side by side - the price indicators below are relative, and your consultant shows exact numbers on your actual openings.
PGTThe line homeowners arrive naming - the most impact certifications in the industry$$$
- More impact certifications than any other line we quote
- WinGuard, EnergyVue and ClassicVue Max systems built for every wind zone
- 99% on-time delivery keeps your install date on the calendar
CGIThe heavyweight impact line$$$$$
- Large-missile impact ratings for the strictest wind zones
- Architectural-grade aluminum with commercial-depth frames
- The line we quote when protection is the whole point
CWSThe value pick$$
- Vinyl systems built to strict wind codes
- Strong energy packages at the friendliest price point
- The smart start for whole-home replacements on a budget
ESWSlim lines, big glass$$$$
- Narrow-sightline aluminum for modern elevations
- Oversized openings and floor-to-ceiling glass
- Impact-rated without the bunker look
ECOThe aluminum impact workhorse$$$
- Factory-built aluminum impact systems
- A strong price-to-protection ratio for coastal homes
- Proven inventory lines with short lead times
Therma-Tru Window Replacement: The Orange County Owner’s Guide
Therma-Tru window replacement in Orange County typically runs $450 – $1,150 per window installed, depending on size, glass package, and whether the frame needs work. We stock Therma-Tru-compatible sashes, balances, weatherstripping, and glass packs on our trucks, so most single-window replacements are done the same day we arrive. The usual way owners find us: a sash that won’t stay up, condensation you can’t wipe off, or a lock that stopped catching. Those are the three failure points we see most across Anaheim, Irvine, and the older Rancho Santa Margarita tracts.
Which Therma-Tru Models This Applies To
We work on Therma-Tru casement windows, double-hungs, sliders, and the newer Heritage and Tru-Defense series lines. Identifying your exact model matters more than most homeowners expect. On the hinge side of the sash or inside the frame track, Therma-Tru stamps a small label with the unit size and glass code. That code tells us the spacer type, low-e coating, and whether we’re matching an argon fill or a basic air fill. Get it wrong and the replacement glass performs differently than the window next to it, which you’ll notice every afternoon when the west light hits that wall differently.
Here’s the compatibility gotcha a lot of Orange County homeowners run into: Therma-Tru has shifted balance shoe and pivot bar designs across production years, and a 2014 double-hung sash will not always drop into a 2019 frame without adapting hardware. We carry both OEM Therma-Tru replacement parts and quality aftermarket equivalents made to spec, and we’ll tell you upfront which one makes sense for your window. Sometimes OEM is worth the premium. Other times the aftermarket pivot bar is actually the better part. We’re not cagey about it either way.
Signs Your Therma-Tru Window Replacement Is Failing
- Fog or haze between the panes. The seal around the glass packet (the insulated glass unit) has failed, letting moisture in. Once that happens, the low-e coating starts oxidizing and the window loses its thermal resistance. This is the single most common reason Orange County homeowners call us in June and July, when coastal humidity meets air-conditioned interiors and the problem becomes obvious.
- Drafts around the sash edges. The weatherstripping on Therma-Tru sashes is a compressible foam or bulb gasket that hardens after 8 – 12 years in Southern California sun. When it stops rebounding, you’ll feel air moving around the window even when it’s latched. On the second floor of a Corona del Mar house with direct ocean exposure, we see this happen in half that time.
- Sash won’t stay up or drops hard. That’s a failed balance assembly – the spring-loaded mechanism inside the side channels that counteracts the sash weight. When a balance goes, the window either slams down or needs a two-handed shove to close. It’s not just annoying; a sagging sash leaves the window unsealed at the top corner.
- Crank or handle spins without engaging. On Therma-Tru casement and awning windows, the operator mechanism strip or the gear teeth on the crank handle wear down with use. You’ll feel the handle turn but the sash won’t move. A replacement operator is a straightforward swap, but the part number has to match the window’s generation.
- Visible cracking at the corner welds or frame joints. Vinyl and composite frames expand and contract in Orange County’s temperature swings. When a corner weld lets go, the frame loses its square and the sash stops seating properly. You’ll usually see a hairline crack at a bottom corner first.
Replacement Cost & What’s Included
The honest Orange County price range for Therma-Tru window replacement: replacing a failed glass packet in an existing sash runs $350 – $650 installed. Replacing the full sash with new hardware, balances, and weatherstripping runs $600 – $1,150 per window. Adding a full frame replacement (which is a different job – we pull the old window down to the rough opening and install new trim) pushes into the $1,200 – $2,400 range depending on size and access. The driver on the low end versus the high end is mostly glass package: a standard clear dual-pane on the first floor costs less than a low-e, argon-filled unit up a ladder on a second-story wall, because labor and handling time go up. We always give you the written price before any work starts – that’s part of the Kingswell Guarantee, and it means the number we quote is the number you pay.
DIY or Call Us?
You can safely inspect the label, measure the sash, and take photos to send us before we quote the job. That shortens the process and helps us stock the right part for the first visit. What you shouldn’t attempt yourself is removing balances under tension or prying a sash out of its track without releasing the pivot pins correctly. Balances are spring-loaded, and a release done wrong can send a sharp metal channel into your hand. There’s a reason every one of our techs carries the training and the tools for this on day one. If the window is large, on the second floor, or the frame shows any cracking, call us at (424) 414-2048 and we’ll schedule a free estimate – you’ll get a live person on the phone, not a voicemail tree.
FAQs
In Orange County’s dry heat and strong coastal sun, a Therma-Tru window with an intact seal typically lasts 20 – 25 years before the glass packet or hardware needs replacement. Windows on west-facing walls in inland cities like Yorba Linda or Lake Forest tend to fail faster because they absorb direct late-afternoon sun and the seal material hardens more quickly. If you’ve got fogged glass at year 15, that’s on the early side but not unusual.
The glass packet itself can’t be “cleaned” once the seal has failed and moisture is inside the air space. The repair is replacing the insulated glass unit within the existing sash, which preserves the frame and trim and costs about half what a full window replacement would. If the sash is also warped or the balances are shot, it’s often cheaper over the long run to replace the entire sash at once. Call (424) 414-2048 and we’ll tell you which one makes sense after looking at photos or a quick site visit.
A glass packet replacement or sash hardware swap takes one to two hours on site for a standard-size window once we have the part in hand. Full frame replacements take a half day to a full day depending on access, stucco repair around the opening, and how many windows we’re doing. We bring the part on the truck for the most common Therma-Tru sizes, which is why we ask for your label photos before we schedule.
We stock common Therma-Tru balances, pivot bars, sash locks, weatherstripping profiles, and glass packets for the most frequently installed sizes in Orange County homes. For unusual sizes or trim levels, we order direct and typically have the part in three to five business days. We also carry parts for PGT, CGI, and CWS windows, so if you’ve got a mixed house – Therma-Tru entry door, PGT windows, CWS sliders – we can handle the whole call in one visit.
Written by Owen Satterfield, Owner, Westlight Windows Orange County at Westlight Windows Orange County, serving Orange County and nearby areas.
Six Reasons Homeowners Choose Westlight Windows Orange County
Laminated glass and reinforced frames hold up to wind-driven rain, hail and flying debris, so your openings stay sealed when the weather turns.
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.
Tighter seals and insulated glass even out hot and cold rooms and stop the drafts at the frame.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.