Choosing new replacement windows

If you are planning to install new energy-efficient windows in your home there are three factors to keep in mind: frame, glass and installation.

First, the frame can be constructed out of a variety of materials, including aluminum, vinyl and wood. Aluminum is not a practical choice in most areas because the metal conducts temperature and can fluctuate between hot or cold, however, because of its durability, aluminum may be the best option in coastal areas or rainy climates. Vinyl is inexpensive and practical, but may be limited in choice of color. Wood-framed windows are the most insulative, but they require more upkeep than aluminum or vinyl.

When it comes to glass, the most often-selected option is an argon-filled, double-paned window with Low-E glass. To understand a window's performance, check its energy-efficiency label. The "R" value is the measure of how well it prevents heat from passing through; it ranges from 2.4 to 4.5, and the higher the better. Conversely, the "U" value measures how much heat actually passes through and this number should be low.

Finally, if your windows are not properly installed, they will not perform effectively so be sure to hire a reputable professional.