Choosing the right windows for North Texas homes isn’t as simple as picking what looks good. A lot rides on how the glass performs. In Part 1 of our blog on U-Factor and SHGC, we explained what those ratings are. Now, let’s talk about what numbers you actually want in the Dallas-Fort Worth area.
Why Do U-Factor and SHGC Matter in North Texas?
In DFW, the weather can change fast. It’s hot and sunny most of the year, but winters can get pretty chilly too. That means your windows have to do double duty. They need to block out heat in summer but hold it in during winter.
That’s where the U-Factor and SHGC come into play. They tell you how good a window is at managing heat.
- U-Factor measures how much heat escapes through the window. Lower numbers mean better insulation. So, the lower the U-Factor, the warmer your home stays in winter.
- SHGC (Solar Heat Gain Coefficient) measures how much solar heat comes through. Again, lower is better in Texas because it keeps your home cooler in the summer.
If you’re in a place like McKinney, Frisco, or Carrollton, the right combo of these ratings helps your HVAC system work less—and that means more savings on your energy bill.
What the Building Codes Recommend for U-Factor and SHGC
Now, let’s talk about the rules. Most areas in the U.S. follow the International Energy Conservation Code (IECC), and that includes cities across North Texas.
According to the IECC:
- In Southern Texas, the U-Factor should be 0.40 or less.
- In Northern Texas, it should be 0.32 or less.
But here’s the good news. If you want windows that meet ENERGY STAR® standards, look for ones with a U-Factor of 0.30 or less. That works for the entire Metroplex, from Arlington to Garland.
As for SHGC:
- Both IECC and ENERGY STAR agree: 0.25 is the max you want.
These numbers may sound small, but they make a big difference in comfort and energy savings.
How These Ratings Work Together
Choosing windows isn’t about finding the lowest numbers across the board. In fact, windows with super-low U-Factors and SHGC can let in less natural light. That’s where Visible Transmittance (VT) comes in. A lower VT means darker rooms.
So, you’ve got to find balance. Look for windows that have:
- A U-Factor below 0.30
- SHGC around 0.25
- A VT rating that still lets in enough sunlight
This combination helps your home stay cool without making it gloomy inside. It’s a win-win.
What Else Should You Look For Besides U-Factor and SHGC?
Transitioning from ratings to performance, there’s one more thing to think about: Air Leakage. This rating tells you how airtight a window is. It’s measured in a range from 0.1 to 0.3.
Lower is better. If a window has a high air leakage rating, it’ll let in drafts—especially during those cold snaps in January or windy spring days.
Also, check out the window’s framing material. For example:
- Vinyl frames resist moisture and don’t warp. They’re great for holding a tight seal.
- Fiberglass frames are super durable and don’t expand or shrink much.
- Wood frames look great but may need more maintenance in humid DFW summers.
Combining the right frame with low U-Factor, SHGC, and Air Leakage ratings ensures long-term comfort and savings.
What Makes Windows Work Best in the DFW Climate?
It’s one thing to buy a window with a good rating. It’s another to make sure it fits your home and lifestyle. Statewide Energy Solutions installs custom-built windows that match your specific needs.
We often recommend Texas Energy Maxx Windows because they check all the boxes:
- ENERGY STAR qualified with low U-Factor and SHGC ratings
- Custom-sized to fit your home exactly
- Made for the South-Central Climate Zone
So whether you live in Flower Mound or The Colony, we’ll help you pick windows that are right for where you live.
Also, we’re more than just a Window Company in Frisco, TX. Our service area includes:
- Window Company in Carrollton, TX
- Window Company in Arlington, TX
- Window Company in Flower Mound, TX
- Window Company in Southlake, TX
- Window Company in Garland, TX
FAQs About U-Factor and SHGC in Texas
1. What’s more important—U-Factor or SHGC? Both matter. In summer, SHGC keeps heat out. In winter, U-Factor keeps heat in. Pick windows with low numbers for both.
2. Should I choose the lowest U-Factor possible? Not always. Super-low U-Factors can reduce light. Talk to us about balance.
3. Do all new windows meet ENERGY STAR standards? No. You’ve got to check the ratings. We’ll help you find the ones that meet or beat those standards.
4. Can one window type fit all rooms? Usually not. Some rooms need more light, others more shade. We’ll help you decide room by room.
Time to Upgrade Your Windows?
Choosing windows with the right U-Factor and SHGC isn’t just about numbers. It’s about comfort, savings, and making your home work better year-round.
If you’re planning a window upgrade or building a new home in the DFW area, let Statewide Energy Solutions help you get it right the first time.
Call us at (214) 960-2798 or use our contact form to set up your free quote.
Need help planning your project? Schedule Your Discovery Call with us today.
Statewide Energy Solutions is your go-to team for window replacement in Frisco, TX and across the Metroplex.
Don’t settle for just any window—let’s find the one that works for your home, your budget, and your future comfort.
