Low-E glass is the single most important feature in a Texas window. Cardinal Low-E coatings block up to 82 percent of the sun’s heat and up to 99 percent of fading UV rays, while your windows stay clear and bright.
Updated November 2026
FGIA Certified Window Installation CompanySee which Low-E glass fits your home. Schedule your in-home consultation and get an itemized proposal.
Low-E glass is window glass with a microscopically thin, invisible metal coating that reflects heat while letting visible light through. Low-E stands for low emissivity. The coating bounces the sun’s infrared heat back outside in summer and keeps your home’s warmth inside in winter, without making your windows look tinted. In our windows, the Low-E coating is paired with argon gas sealed between the panes, which slows heat moving through the glass.
In Texas, Low-E glass windows are what keep west-facing rooms livable in August. The right coating lowers cooling costs, protects floors and furniture from fading and makes every room more comfortable.
It reflects heat, not light. Sunlight carries visible light, infrared heat and ultraviolet rays. A Low-E coating lets most of the visible light pass through, but reflects much of the infrared heat and blocks most of the UV.
In summer, the coating bounces the sun’s heat back outside before it reaches your rooms, so your AC does not have to fight your windows.
In winter, it reflects the heat from your furnace back into the room, so warm air stays inside.
The result: a cooler, brighter home with lower energy bills all year.
Regular glass lets the heat right in. Clear, uncoated glass lets most of the sun’s heat pass straight through, which is why rooms with older windows bake every afternoon. Low-E glass windows still let in plenty of natural light, but they block far more heat and UV. Here is how much of the sun’s heat each glass option stops.
Every Cardinal Low-E package keeps Texas heat outside. The difference is how much. Choose one glass package for the whole home based on how much sun your home takes and how much light you want inside. Every package blocks 95 to 99 percent of fading UV rays. We walk you through every option during your in-home consultation. See how glass packages compare across top window brands.
Balanced heat control with clear, neutral views and comfortable daylight. The most versatile Low-E glass for Dallas-area homes.
Four silver layers for stronger heat control than 366 with more natural light than 340+. Blocks 99 percent of UV rays and includes Neat+.
Blocks the most solar heat of any package we offer and cuts glare. Ideal for homes in full Texas sun. Includes Neat+.
Add-on: LoĒ-i89 interior coating. A clear coating on the room-side surface of the glass that reflects your home’s heat back inside in winter. Paired with Quad LoĒ-452+, it lowers a dual-pane window’s U-factor from 0.24 to 0.20.
| Glass package | Solar heat blocked | Neat+ coating | Ideal for |
|---|---|---|---|
| LoĒ³-366 | 73% | Not included | Most Dallas-area homes |
| Quad LoĒ-452+ | 78% | Included | Heat control with more natural light |
| LoĒ³-340+ | 82% | Included | Homes in full Texas sun |
Included with LoĒ³-340+ and Quad LoĒ-452+. A sunlight-activated coating that helps rain rinse away dirt and mineral buildup, so your glass stays cleaner between washes.
Offset glass thickness and acoustic layers that cut street and traffic noise for quieter rooms and better sleep.
Reduces heat transfer around the edge of the glass, where most energy loss happens, and helps extend seal life.
A factory film that protects the glass from scratches and debris during shipping and installation, then peels away clean.
Add privacy or style while keeping rooms bright. Perfect for bathrooms, entryways and sidelites.
Satin
Rain
Obscure
Glue ChipIn Texas, yes. Low-E glass blocks up to 82 percent of the sun’s heat, so your AC runs less and rooms that used to bake in the afternoon finally stay comfortable. It also blocks up to 99 percent of the UV rays that fade floors, rugs and furniture, and it keeps your home warmer in winter.
Nearly every quality replacement window today is a Low-E glass window, so the real decision is which package fits your home. We install Low-E windows across Plano and nearby cities, with Cardinal glass on Burris windows and Pella InsulShield glass on Pella windows, and every installation is done by Optimal Windows, an FGIA Certified Installation Company. See how it fits into energy efficient window replacement.
FGIA certified, so your windows perform the way they were built to. Optimal Windows is an FGIA Certified Window Installation Company, which means every window we install goes in to a national installation standard, not just the way an installer happened to learn on the job. That matters because Low-E glass can only block heat if the frame around it is sealed tight, so a precise installation is what lets your new glass keep your home cooler.
From there, the rest is simple. Our salespeople are never on commission. Every project starts with an in-home consultation and ends with an itemized proposal, so you know exactly what you are getting and what you are paying for, and every window is backed by the manufacturer’s limited lifetime warranty plus our own workmanship warranty.
Installed to a national standard, so your windows seal tight and perform for years.
Honest guidance with no pressure tactics.
Every window detailed line by line.
Low-E glass that keeps the heat outside.
We install Low-E windows for homeowners across Plano and nearby cities, including:
Window Replacement
Window Replacement
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Window Replacement
Recent projects showcasing professionally installed, energy-efficient windows in a variety of home styles and settings.
Yes. Cardinal Low-E glass blocks 95 to 99 percent of the UV rays that fade floors, rugs and furniture, depending on the package. Quad LoĒ-452+ (Low-E 452+) blocks 99 percent.
Low-E argon glass combines a Low-E coating with argon gas sealed between the panes. The coating reflects the sun’s heat, and the argon, which is denser than air, slows heat moving through the window. Together they keep your home cooler in summer and warmer in winter.
Hold a lighter or small flashlight up to the glass and look at the reflections. With clear glass, every reflection is the same color. With Low-E glass, one reflection shows a slightly different color because of the coating. The label on new windows also lists the glass package.
On the Burris windows we install, Cardinal LoĒ³-366 (Low-E 366) comes standard. Upgrading to LoĒ³-340+ (Low-E 340+) adds about $40 per window, and Quad LoĒ-452+ about $70 per window. Your total depends on the window line, size and style. See a price range in about a minute with our online estimator.
Not sure which Low-E glass fits your home? Book an in-home consultation and we will look at your sun exposure, walk you through every glass package and build an itemized proposal for your exact windows. Call (972) 768-1999 or send us a message.
Clear Expert Guidance.
5760 Legacy Dr B3366, Plano, TX 75024
Monday - Friday: 24 Hours
Saturday - Sunday: Closed
We respect your time and never use high-pressure sales tactics
