Don’t Fall for the Hype About Energy-Efficient Windows
If you’re shopping for energy-efficient windows in Utah, you’ve probably heard some impressive claims about how many layers of Low-E glass coating different window brands offer.
Some sales reps boast about “11 layers” of Low-E—or even more. At first, that sounds like top-of-the-line performance. But here’s the truth: those numbers are marketing exaggerations, not actual product specs.
The Real Story Behind Low-E Glass
In Utah’s residential window and door market, the majority of the glass comes from just a handful of manufacturers. According to Industry Select and Brennen Enterprises, Cardinal Glass Industries is the largest residential glass manufacturer in the U.S. When it comes to low-emissivity (Low-E) glass specifically, Vitro Architectural Glass is the biggest player.
As a Utah window replacement company, we see Cardinal Glass used in nearly every major brand sold throughout the state. That means whether you’re comparing Brand A or Brand B, chances are the glass is made by the same manufacturer.
Where the “Embellishment” Happens
Here’s the key fact: major glass manufacturers like Cardinal only offer two or three Low-E coatings. So where do claims of 11 or even 16 layers come from? Usually, they’re sales embellishments—meant to make one product seem better than another.
If a salesperson makes a claim like this, the best response is simple: ask for the manufacturer’s documentation. If they can’t provide proof, that’s a red flag. In many cases, it’s not intentional deception—some reps are simply repeating what they were told in training.
The Truth About Utah’s Most Popular Energy-Efficient Glass
The most commonly used glass for energy-efficient replacement windows in Utah is LoĒ-366 (Cardinal 366). This high-performance glass is engineered to:
- Block heat during the summer
- Retain warmth in the winter
- Protect furniture and flooring from fading due to UV rays
The “3” in 366 refers to the three Low-E coatings on the glass. That’s what most homeowners actually have in their energy-efficient windows—not 11 or 16.
For homeowners who want an extra performance boost, there’s Quad 452+. This glass package features a true four-layer silver coating with ultra-low emissivity, 99% UV protection, low exterior reflection, and superior solar control. It also includes Neat+, an exterior coating that helps windows stay cleaner longer and reduces maintenance.
Why Honest Glass Specs Matter
When it comes to window replacement in Utah, facts matter more than flashy sales pitches. A company that’s transparent about its glass specs is a company you can trust.
Low-E glass coatings are a proven energy-saving technology—but more coatings don’t always mean better performance. What matters most is using the right glass for Utah’s climate.
Learn More About Low-E Glass Options
Want to dive deeper? You can explore manufacturer-verified glass packages directly from Cardinal Glass.
And if you’re looking for honest, expert guidance on the best replacement windows in Utah, reach out to Utah Valley Window and Door. We’ll help you choose the right Low-E glass package for your home—no gimmicks, no inflated numbers.