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Adding Energy Efficient Windows In Phoenix Produces A Sizable Impact
In climates such as southern and central Arizona, including Phoenix, replacement windows can certainly make a noticeable impact in the comfort level of your house and in your utility bills. On top of the benefits related to energy and money savings, energy efficient replacement windows also improve the look of a home, reduce the noise level, allow less dust to enter a home, protect the interior (carpet, rugs, floors, furniture, window coverings, art, pictures) against fading caused by ultraviolet light, permit more light in and reduce condensation on the windows.
Window Ratings
With more than three hundred days of sunlight per year, how effectively a window restricts the heat and ultraviolet rays from the sun is very important. Energy Star windows are ranked in five categories. The U-Factor and the Solar Heat Gain Coefficient assess how much heat a window transfers and are the main rankings to focus on when choosing replacement windows for a Phoenix home.
Solar Heat Gain
Solar heat gain is the volume of the sun's energy which is transmitted through a window. The sun's heat is transmitted through the glass and 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 factor. Windows employ a variety of techniques to prevent solar gain.
Low-E Coatings
Low-E coatings diminish the heat and ultraviolet rays which pass through a window. Low-E coatings are extremely 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 reduce solar gain, many double pane windows utilize 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). The gasses are heavier than air and make it more difficult for hot or cold air to pass through. Krypton is the heavier of the two gasses and needs a narrower gap between the panes however it is more expensive. The gasses are non-toxic so a damaged window does not create a health risk.
Window Frames
Vinyl windows frames have hollow spaces inside which may be filled with insulation to enhance their thermal performance. Aluminum transmits heat very well so aluminum windows posses poor thermal performance unless a thermal break is added. A material which transmits heat very poorly is positioned between the aluminum pieces on the inside and outside of the window to create a thermal break.
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