Why Window NFRC Ratings May Be WRONG for YOUR Project

Energy performance is one of the least understood aspects of windows and doors—and also one of the most misapplied.

I teach classes on Low-E coatings, glass color and tint, comfort vs. compliance, and how manufacturer and NFRC data can easily mislead if not interpreted properly.

Some questions I walk teams through:

• Performance vs. Prescriptive code compliance—what’s the real goal?

• SolarBan 70 vs. 60 vs. LoE366/340 vs. N70/38 vs. SN-L 68... what actually fits your project?

• Insulated laminated vs. non-insulated laminated—when do you need each?

• Why does “clear” glass sometimes look green?

• How do glass coatings impact interior color, comfort, and clarity?

• Are you prioritizing comfort or just checking the box on performance?

Passing an NFRC test doesn’t guarantee comfort, visual quality, or real-world performance. That’s where I come in—to help architects and builders select systems that meet specs and expectations.

Why Window NFRC Ratings May Be WRONG for YOUR Project