In climates such as southern and central Arizona, including Phoenix, replacement windows will certainly make a perceptible improvement in the comfort level of your house and in your utility bills. As well as the benefits related to energy and money savings, energy efficient replacement windows also improve the overall look of a home, reduce the noise level, allow less dust to enter a property, preserve the interior (carpet, rugs, floors, furniture, window coverings, art, pictures) from fading produced by ultraviolet light, allow more light in and reduce condensation on the windows.

Window Ratings
With well over three hundred days of sun each year, how efficiently a window inhibits the heat and ultraviolet rays from the sun is essential. Energy Star windows are scored in five categories. The U-Factor and the Solar Heat Gain Coefficient assess the amount of heat a window transfers and are the central rankings to focus on when looking for replacement windows for a Phoenix home.

Solar Heat Gain
Solar heat gain represents the percentage of the sun's energy stated more precisely transmitted through a window. The sun's heat is transmitted through the glass and the window frame and sash. The frame and sash can make up 10-30% of the area of a window so the frame construction is a vital feature. Windows make use of a number of techniques to minimize solar gain.

Low-E Coatings
Low-E coatings minimize the heat and ultraviolet rays that pass through a window. Low-E coatings are extremely thin, invisible metal layers connected to the glass. High, medium and low solar gain options of Low-E coatings are readily available. To further minimize solar gain, certain dual pane windows include Low-E coatings on both pieces of glass.

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

Window Frames
Vinyl windows frames are made with hollow spaces inside which may be filled with insulation to enhance their thermal performance. Aluminum transmits heat very 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 interior and outside of the window to create a thermal break.

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