In locations such as southern and central Arizona, including Phoenix, replacement windows can certainly make a noteworthy difference in the comfort level of your home and in your utility bills. Combined with the benefits related to energy and money savings, energy efficient replacement windows also improve the look of a home, make it quieter, allow less dust to come in a property, preserve the interior (carpet, rugs, floors, furniture, window coverings, art, pictures) from fading caused by ultraviolet light, let more light in and reduce condensation on the windows.

Window Ratings
With more than 300 days of sunlight every year, how efficiently a window inhibits the heat and ultraviolet rays from the sun is essential. Energy Star windows are rated in 5 categories. The U-Factor and the Solar Heat Gain Coefficient measure how much heat a window transfers and are the key score to concentrate on when looking for replacement windows for a Phoenix home.

Solar Heat Gain
Solar heat gain indicates the percentage of the sun's energy that is transmitted through a window. The sun's heat is passed through the glass and the window frame and sash. The frame and sash can comprise 10-30% of the total area of a window so the frame construction is a significant consideration. Windows employ a range of techniques to lessen solar gain.

Low-E Coatings
Low-E coatings limit the heat and ultraviolet rays passing through a window. Low-E coatings are very thin, invisible metal layers applied to the glass. High, medium and low solar gain variations of Low-E coatings are available on the market. To further diminish solar gain, certain dual pane windows have Low-E coatings on both pieces of glass.

Gas Fillings
Double pane windows have a space between the panes of glass. This gap can be filled air or gas (Argon gas or Krypton gas). The gasses are denser than air and make it tougher for hot or cold air to pass through. Krypton is the heavier of the two gasses and requires a narrower space between the panes however it is more costly. The gasses are non-toxic so a broken window does not pose a health risk.

Window Frames
Vinyl windows frames have hollow spaces inside which can be filled with insulation to boost their thermal performance. Aluminum transmits heat quite well so aluminum windows feature poor thermal performance without a thermal break. A material which transmits heat very poorly is placed between the aluminum pieces on the inside and exterior of the window to create a thermal break.

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