In environments such as southern and central Arizona, including Phoenix, replacement windows will make a perceptible improvement in the comfort level of your home 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, make it quieter, permit less dust to come in a home, protect the interior (carpet, rugs, floors, furniture, window coverings, art, pictures) against fading caused by ultraviolet light, let more light in and reduce condensation on the windows.
Window Ratings
With well over 300 days of sunshine every year, how effectively a window prevents the heat and ultraviolet rays from the sun is very important. Energy Star windows are rated in 5 categories. The U-Factor and the Solar Heat Gain Coefficient measure the amount of heat a window transfers and are the most important ratings to emphasis on when shopping for replacement windows for a Phoenix home.
Solar Heat Gain
Solar heat gain represents the volume of the sun's energy that is 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 total area of a window so the frame construction is an essential consideration. Windows utilize a number of techniques to minimize solar gain.
Low-E Coatings
Low-E coatings reduce the heat and ultraviolet rays passing through a window. Low-E coatings are very thin, invisible metal layers attached to the glass. High, medium and low solar gain versions of Low-E coatings are available. To further diminish solar gain, many double pane windows include Low-E coatings on both pieces of glass.
Gas Fillings
The gap 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). The gasses are heavier than air and make it tougher for hot or cold air to pass through. Krypton is the denser of the two gasses and requires a smaller space between the panes but is more expensive. The gasses are non-toxic so a damaged window does not pose a health risk.
Window Frames
Vinyl windows frames are made with hollow spaces inside which can be filled with insulation to improve 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 positioned between the aluminum pieces on the inside and exterior of the window to create a thermal break.
In Phoenix, Replacement Windows Make A Substantial Difference
In climates such Phoenix, energy efficient windows can make a noticeable difference in the comfort level of your home and in your utility bills as well as extend the life of your air conditioner because it will have to run less.
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