Installing Energy Efficient Windows

Installing energy efficient windows is a smart decision, and one that will not only affect heating and cooling bills but can also eliminate upkeep and repairs for many years to come.

Before Installing Energy Efficient Windows

Three basic types of window frames are on the market today: wood, vinyl, and aluminum. A fourth, fiberglass, is becoming more popular and may also be available in your area. Wood and vinyl are more energy-efficient than aluminum, which acts as a hot and cold conductor. Wood requires maintenance, such as sealing and painting, although some wood frames now have a vinyl outer coating. Vinyl frames require no maintenance, but may bend and bow under the weight of heavier windows.

Window styles will also affect energy efficiency; single hung has a high rating, while casement and double hung windows allow more heat loss and gain. Double panes are now standard and may be glazed or filled with gas to increase efficiency.

An understanding of energy ratings will help in making a purchasing decision. The e-value refers to the type of coating on the glass -- it indicates the amount of transmitted light and heat. E-value ratings are administered by the National Fenestration Rating Council (NFRC); participating manufacturers will have them prominently displayed on their products. In addition, r-values are based on heat resistance and u-values are calculated on heat conductivity. Higher r-values and lower u-values indicate greatest energy efficiency.

Climate and window location are other factors to consider before installing energy efficient windows. South-facing windows, for instance, will have different ratings requirements from those on a north face.

Tips for Installing Energy Efficient Windows

Manufacturers include detailed instructions for installing energy efficient windows. Be sure to read these guidelines carefully. While some window installation basics are standard, each brand has its own specific details and shortcuts that will make the job easier.

Replacing existing windows with new ones is a fairly simple task for those with carpentry skills. You will need basic tools such as a hammer, drill, tape measure, caulk, weather stripping, screwdriver, and square.

One of the major pitfalls of purchasing a window is mis-measurement. Always measure windows from the inside, from the left to right jambs and then from top jamb to bottom sill. Apply caulk in dry conditions and at temperatures above 45 degrees. Clear the area of debris and dust before caulking.

Before installing new windows, give the frames a new coat of paint if necessary. Allow paint to dry thoroughly. If you are installing heavier windows in an older home, it may be wise to consult with an engineer or other professional who can test the surrounding structure for maximum load-bearing weight.

By Cindy Kennedy