Understanding the Energy Efficiency Ratings on Windows
Replacement windows can be necessary if they have degraded enough from when they were first installed. They could experience seal failure along the edge of the panes, drafts along the sill, or leaks due to exposure to the exterior of the home. If you're experiencing any of these things in a window, you may need a window replacement.
There are many differences between types and brands of windows, but many things are measured in the same way.
For example, the U-Factor is a measure of how effectively the window is insulated. The measurement is a lower number, which means the window is blocking more energy from passing into the home. These range from .20 to 1.20, with triple pane, krypton-insulated windows taking the most insulated spot.
Another standardized measurement is SHGC, or solar heat gain coefficient. This number also gets lower as more heat is blocked from entering the home. This measurement was designed specifically for climates where temperatures get quite high, such as the Southern part of the United States. This is measured from 0-1, so the closer to 0 a window is rated, the more effective it will be in keeping heat outside your home.
The speaker in the video recommends speaking to an expert on window replacement for more advice for your home.
