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How to Look for Energy-Efficient Replacement Windows

Energy-efficient replacement windows are a worthy investment. They make your home more comfortable, they help you save on monthly utility costs, and they boost your home’s value and curb appeal. But how can you ensure that you’re getting energy-efficient windows? These pointers should help.

Look for the ENERGY STAR® and Energy Performance Labels

You may already be familiar with ENERGY STAR®, the product labeling program that identifies energy-efficient products. Even without looking at anything else, you can be assured of energy savings when you choose a window with an ENERGY STAR label. If you need windows for specific applications in mind, look for the energy performance label. There are two particular ratings you should know:

  1. U-Factor rates window insulation, specifically how much heat can escape through it. The lower the U-Factor value, the better the insulation. Some windows may have R-Value ratings instead of U-Factor. While both rate window insulation, R-Value rates resistance to heat flow. Therefore, a window with a low U-Factor will have a correspondingly high R-Value.
  2. Solar Heat Gain Coefficient (SHGC) rates how much solar heat can pass through the window. Look for lower SHGC if solar heat is a problem during summer. Homeowners who live in mostly cold climates may prefer to have windows with high SHGC.

Pay Attention to the Frame Material

Window frames usually end up mostly covered by trim so it is one of the most often overlooked replacement window components. To get the best replacement windows, you need quality frames. We at Renewal by Andersen know how critical a component the frames are so that’s why ours are made with our exclusive Fibrex® material. Combining the strength and stability of wood with the low-maintenance requirements of vinyl, our Fibrex frames feature natural insulation and won’t warp or crack when exposed to extreme temperatures.

Double Pane Glass

Glass is a naturally conductive material. Therefore, windows equipped with traditional single-pane glass are inefficient. Instead, choose double-pane glass. The space between the interior and exterior surfaces acts as an insulating layer and can be enhanced with insulating gas fills. It has proven to be so effective that all Renewal by Andersen® replacement windows are equipped with High Performance™ Low-E4® glass.

Renewal by Andersen of Boise is your leading provider of home window replacement services. Give us a call at (208) 874-4900, or fill out our contact form to schedule an appointment.


"Quality. That is the word that comes to mind. Everyone was very friendly and professional. The overall experience was excellent and the door is fantastic."

Shaun | ID
October 30

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