Windows: Know your Energy Star ratings!
WE NO LONGER SELL WINDOWS BUT HERE ARE SOME USEFUL TIPS!!
NOT ALL WINDOWS ARE CREATED EQUAL!
ENERGY STAR is a government-backed program helping businesses and individuals protect the environment through superior energy efficiency. For Windows&Patio Doors they have created a rating system that defines good performance in these products. In fact all government rebate programs make Energy Star guidelines the minimum for qualifying.
So What Are The Ratings?
The first element is U FACTOR. This is a measurement of the amount of heat escaping a home. Windows must have a minimum rating of .30 to be Energy Star endorsed. U FACTOR would be the most important element in COLDER Climates where heat loss is more a concern than heat gain.
Element two is SOLAR HEAT GAIN COEFFICIENT (SHGC). This is a measurement of the amount of heat blocked from the sun. Windows must have a minimum rating of .30 to be Energy Star endorsed. SHGC would be the most important factor in WARMER Climates where heat gain is more of a concern. A difference of .01 can mean an additional 2 degrees coming in.
The other elements of interest are Visible Transmitance (VT) which measures the amount of light allowed in. Air Leakage (AL) which measures the amount of outside air coming into a home. Sound Transmitance (ST) which measures the amount of sound blocked from outside. These elements do not have a minimum rating by Energy Star but generally VT should be .50 or above, AL should be lower than .3, and ST should be 27 or higher.
Eco Advantage Window & Door products regularly EXCEED ALL ENERGY STAR RATINGS!