Window technology has improved rapidly over the past 20 years, and any home built before 1980 can greatly benefit from new windows. Today windows are more energy efficient in terms of keeping conditioned air inside -- which not only makes for lower utility bills, but also increases day-to-day comfort in the living space.
One of the most significant improvements in window technology was the development of Low-E windows. Low-E or low emissivity glass is treated with a very fine layer of metal that blocks out certain ultraviolet rays from the sun and reflects a significant amount of solar radiation away from the home.
This filtering and reflecting process has a two-fold effect. First, by reflecting solar radiation, less heat is allowed to enter the home, which creates a more comfortable living environment and lower utility bills. Second, by limiting the amount of ultraviolet radiation, Low-E windows help protect carpets and furniture from fading due to exposure to direct sunlight. Low-E windows typically cost about 10 to 15 percent more than regular windows, but they reduce energy loss by as much as 30 to 50 percent and extend the life of furnishings. Energy Star certifies windows that improve a home's energy efficiency and often window replacement can come with significant financial incentives.
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