In environments such as southern and central Arizona, including Phoenix, replacement windows will certainly make a noteworthy difference in the comfort level of your house and in your utility bills. As well as the benefits associated with energy and money savings, energy efficient replacement windows also improve the look of a home, reduce the noise level, 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, allow more light in and help reduce condensation on the windows.

Window Ratings
With more than three hundred days of sunlight in a year, how efficiently a window inhibits the heat and ultraviolet rays from the sun is important. Energy Star windows are ranked in five categories. The U-Factor and the Solar Heat Gain Coefficient compute how much heat a window transfers and are the central rankings to emphasis on when looking for replacement windows for a Phoenix home.

Solar Heat Gain
Solar heat gain indicates the amount of the sun's energy which is transmitted through a window. The sun's heat is transmitted through the glass in addition to the window frame and sash. The frame and sash can comprise 10-30% of the area of a window so the frame construction is a critical determinant. Windows make use of a range of techniques to reduce solar gain.

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

Gas Fillings
Dual 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 harder for hot or cold air to pass between the panes. Krypton is the heavier of the two gasses and needs a narrower space between the panes however it is more costly. The gasses are non-toxic so there is no health risk if a window is broken.

Window Frames
Vinyl windows frames have hollow spaces inside which may be filled with insulation to enhance their thermal performance. Aluminum transmits heat very efficiently so aluminum windows feature poor thermal performance without a thermal break. A material which transmits heat very poorly is inserted between the aluminum pieces on the inside and outside of the window to form a thermal break.

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