
Reading the NFRC Label Before You Buy Windows in Grand Rapids
After decades of hanging windows across Kent County, we can tell you the sticker on the glass matters more than the brochure. That white sticker is the NFRC label, and it holds the numbers that predict how a window will actually behave through a Grand Rapids winter. Here is how to read it before you sign anything.
Start With the U-Factor
The U-factor measures how fast heat escapes through the whole window. Lower is better. In a cold climate zone like ours, you want a low U-factor so your furnace is not fighting the glass all January. When two windows look identical in the showroom off Plainfield Avenue, the U-factor is usually what separates a warm room from a cold one.
Then Check the SHGC
The Solar Heat Gain Coefficient tells you how much of the sun’s heat comes through. In Michigan, a moderate SHGC is a nice thing, because free winter sun through a south-facing window takes a little load off the heat. It is a balance, and we walk each room through it during the measure.
Do Not Ignore the Other Ratings
Visible Transmittance tells you how much light comes in, and Air Leakage tells you how drafty the unit is rated to be. A window can have great glass and still leak if it is installed poorly, which is why proper flashing matters as much as the label. If you want the full rundown on matching glass to this climate, our energy-efficient windows page goes deeper.
Match the Label to the Method
The best label does nothing if the frame underneath is rotted. When framing is soft, a full-frame window replacement lets us fix the opening before the good glass goes in. On sound frames, an insert swap keeps the numbers and skips the mess.
Ask for the Label in Writing
A trustworthy installer will hand you the NFRC label for your records, not just quote a brand name. We always do. If a quote will not commit to specific U-factor and SHGC numbers, keep asking.
Thinking about new windows for your Grand Rapids home? Call Blackteasociety at (616) 952-6849 or contact us for a free in-home estimate.
