Windows 101

When purchasing new windows, one important consideration is the type of material used to make the window sash and frame. Now more than ever before homeowners have a choice of several materials.

--Aluminum — While less expensive, aluminum windows are less energy efficient than windows made of other materials. Aluminum windows may experience conductive heat loss and condensation around the frame. If your home is equipped with aluminum windows, you may feel more heat or cold when you are near your windows. Another drawback is that while they can be painted to accommodate a color change to a home’s exterior, the paint job may not be as natural looking as paint on wood or fiberglass.

--Fiberglass — A relative newcomer to the window industry, fiberglass windows are some of the most energy efficient windows, because they do not warp, shrink, swell, rot or corrode in varied climates. Because of their thermal stability, they are excellent for holding large expanses of glass. Fiberglass windows are typically more expensive than aluminum or vinyl.

--Vinyl — One of the most popular materials, vinyl windows are durable, generally lower cost, and energy efficient. While they are typically available in a wide variety of light colors, one drawback is they cannot reliably be painted another color if the home’s exterior changes, because paint doesn’t adhere well to the vinyl. Another consideration is climate. In areas of extreme heat, vinyl windows may get soft or sag, compromising the seal between the glass and the frame. Repeated exposure to extremes of heat and cold may cause the windows to become less energy efficient.

--Wood — The first material in windows and doors, wood windows are still a wise choice for many homeowners trying to upgrade a home’s original windows with more energy efficient models. Wood windows produce higher R-values, are unaffected by temperature extremes, and are less prone to condensation. Many wood windows feature aluminum or vinyl cladding on the exterior, which reduces external maintenance.

Tips

Different climates require different window technologies and materials for optimal performance. Be sure to check with the experts at your local window store to determine the best options for you.
Read about "When to replace windows" and "Look for the ENERGY STAR® logo" on the Pella Pressroom for more information.