Understanding Energy Ratings for Windows and Doors
Qualifying for the $200-$500 federal tax credit on new windows and doors depends on two measurements, U-factor and Solar Heat Gain Coefficient.
Just because windows or doors are Energy Star-labeled doesn't mean they're eligible for a federal tax credit. And with costs running about $500-$1,000 per window including labor, it's wise to know something about the scientific lingo and numbers on the product labels you're likely to encounter. Here's your pro-level label-decoding guide so you can be sure you're buying qualified products.
Which Labels Matter?
The two labels you should look for: The U.S. Department of Energy's blue-and-yellow Energy Star label, which specifies the climate zones the…