CR decodes the NFRC's energy-efficiency label that you'll see on most replacement windows By Consumer Reports On every new window there’s a label with an inscrutable bunch of numbers.

Though it may seem like a daunting task getting to the bottom of the problem, start by looking for NFRC & Energy Star labels on products while researching your next home improvement project.

The NFRC label won’t tell you whether your window is Energy Star. You’ll have to look for a separate Energy Star label. What that label won’t tell you is whether your window meets new ...