Energy Xtreme Windows

energy xtreme windows


The Energy Xtreme™ line of replacement windows is designed to provide the utmost in protection for your home – no matter what Mother Nature throws your way. Combining the most energy-efficient components with the latest technology, the Xtreme™ brand puts YOU in control of your heating and cooling expenses. Because the one place you DON’T want to be extreme is with your utility bills.



U-VALUE: Measures the rate of non-solar heat loss or gain. Tests are usually performed under conditions which simulate 0˚F outside and 70˚F inside, with a 15 MPH wind. The lower a U-Value, the greater a window’s resistance to heat flow, and the better its insulating value. R-Factor is simply the inverse of the U-Factor, and can be obtained by dividing 1 by the U-Value.

SOLAR HEAT GAIN CO-EFFICIENT (SHGC): The fraction of solar radiation admitted through a window, including what is absorbed and released inward. The lower a window’s SHGC, the less solar heat it transmits and the greater its shading ability. Different climates require different SHGC values for maximum efficiency.

VISIBLE LIGHT (VL): The fraction of the visible spectrum of light, weighted by the sensitivity of your eyes, that is transmitted through the window. It represents the amount of daylight that the window lets in.

LOW-E COATING: A microscopically thin, virtually invisible, metallic layer deposited on the glass surface primarily to reduce the U-Value by suppressing radiant heat flow.

ARGON AND KRYPTON: Odorless, colorless, non-toxic, inert gasses that can be used instead of air between panes of glass to increase insulation and energy efficiency. Argon is an excellent insulator, a good value and more readily available. Krypton is a denser gas, and therefore a better insulator.

NFRC:  You should select windows that make the most sense for your climate. While some windows are better at keeping you warm, others excel at keeping you cool. Performance criteria are based on the climate zones and ratings certified by the National Fenestration Rating Council (NFRC). View Site

ENERGY STAR:  A joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices. View Site