A low-e glass (low emissivity) is a windowpane coated in microscopic layers of metallic oxides. These coating appear invisible to the naked eye, allowing as much natural light into the house as possible. This coating also protects your home from unwanted UV rays which can burn your skin, fade your carpets or furniture, Wow could be costly. It also assists in controlling radiant heat (infrared light) in a room. This means, it keeps your house warmer in the winter and cooler in the summer by reflecting particular sections outside. You could save on your utility expense while enjoying a more comfortable living space. Low-e windows are definitely worth the dime. They almost come standard now, but if you’re remodeling an older house, these glazes can save you serious money. Keep in mind, since energy-efficient windows reflect more sunlight than just glass windows, these windows are somewhat curved and they can focus sunlight and cause damage. Damage to the sidings of homes and to automobiles have been reported and Low-E windows may also block radio frequency signals. This could mean that homes or buildings without external antennas may suffer degraded cell phone reception. Good to know and worth asking your professional contractor. Ask GlassNPane.com. Remember, the more you know, the more you grow.