In Phoenix, Replacement Windows Produce An Enormous Difference
In climates such as southern and central Arizona, including Phoenix, replacement windows can make a noticeable improvement in the comfort level of your house and in your utility bills. Combined with the benefits related to energy and money savings, energy efficient replacement windows also improve the appearance of a home, reduce the noise level, allow less dust to enter a house, protect the interior (carpet, rugs, floors, furniture, window coverings, art, pictures) from fading produced by ultraviolet light, let more light in and reduce condensation on the windows.
Window Ratings
With in excess of three hundred days of sunlight per year, how well a window restricts the heat and ultraviolet rays from the sun is essential. Energy Star windows are scored in 5 categories. The U-Factor and the Solar Heat Gain Coefficient assess the amount of heat a window transfers and are the most significant score to focus on when buying replacement windows for a Phoenix home.
Solar Heat Gain
Solar heat gain is the percentage of the sun's energy stated more precisely transmitted through a window. The sun's heat is passed 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 significant factor. Windows use a variety of techniques to minimize solar gain.
Low-E Coatings
Low-E coatings minimize the heat and ultraviolet rays passing through a window. Low-E coatings are extremely thin, invisible metal layers attached to the glass. High, medium and low solar gain varieties of Low-E coatings are available on the market. To further reduce solar gain, some double pane windows include Low-E coatings on both pieces of glass.
Gas Fillings
The space between the panes of glass in dual pane windows which can be filled with gas (Argon gas or Krypton gas). This gap can be filled air or gas (Argon gas or Krypton gas). Being heavier than air, the gasses make it tougher for hot or cold air to pass through. Krypton is the denser of the two gasses and needs a narrower gap between the panes but is more expensive. 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 boost their thermal performance. Aluminum transmits heat very well so aluminum windows have poor thermal performance unless a thermal break is added. A material which transmits heat very poorly is placed between the aluminum pieces on the interior and exterior of the window to create a thermal break.
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