In Phoenix, Replacement Windows Make A Massive Impact
In environments such as southern and central Arizona, including Phoenix, replacement windows can certainly make a noticeable impact in the comfort level of your home and in your utility bills. In addition to the benefits associated with energy and money savings, energy efficient replacement windows also improve the overall look of a home, reduce the noise level, allow less dust to come in a home, protect the interior (carpet, rugs, floors, furniture, window coverings, art, pictures) against fading caused by ultraviolet light, allow more light in and help reduce condensation on the windows.
Window Ratings
With well over three hundred days of sunlight in a year, how effectively a window restricts the heat and ultraviolet rays from the sun is crucial. Energy Star windows are rated in five categories. The U-Factor and the Solar Heat Gain Coefficient compute the amount of heat a window transfers and are the most significant rankings to emphasis on when choosing replacement windows for a Phoenix home.
Solar Heat Gain
Solar heat gain is the proportion of the sun's energy that 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 make up 10-30% of the area of a window so the frame construction is a critical determinant. Windows employ a variety of techniques to inhibit solar gain.
Low-E Coatings
Low-E coatings reduce the heat and ultraviolet rays that pass through a window. Low-E coatings are incredibly thin, invisible metal layers connected to the glass. High, medium and low solar gain varieties of Low-E coatings are available on the market. To further inhibit 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 panes of glass. This gap can be filled air or gas (Argon gas or Krypton gas). The gasses are heavier than air and make it harder for hot or cold air to pass between the panes. Krypton is the denser of the two gasses and needs a narrower space between the panes however it is more expensive. The gasses are non-toxic so there is no health risk if a window is broken.
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 efficiently so aluminum windows posses poor thermal performance unless a thermal break is added. A material which transmits heat very poorly is added between the aluminum pieces on the inside and outside of the window to form a thermal break.
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