Energy Efficient Replacement Windows

When choosing replacement windows, it is always good to consider the energy efficiency of each dealer or manufacturers choice in windows, whether they be of the vinyl or aluminum variety. Always look for a label with the window’s ratings from the National Fenestration Rating Council.

The NFRC label shows test results in these areas:

• U-factor: a measure of how well a window keeps heat inside a building. The lower the U-factor, the greater a window’s resistance to heat flow and the better its insulating value. A good U-factor can qualify a window for an Energy Star rating from the U.S. government.
• Solar heat gain coefficient: the ability of the window to block warming caused by sunlight.
• Visible light transmittance: the amount of visible light that passes through a product.
• Air leakage: how much air gets in or out through cracks in the window assembly.

Benefits of  energy efficient windows reach beyond lower costs for heating and air conditioning. Energy efficient windows also improve comfort while increasing light and offering clear views.