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Window glazing putty alternatives8/19/2023 ![]() The software, which is free (PC-compatible only), lets you calculate how windows with different glazing systems and frame materials will affect your energy bill. You can also go to and download a program called Resfen. Energy Star windows generally exceed building code requirements and cost about 15 percent more than windows without the rating. An Energy Star sticker means a window has met the minimum standard for insulating ability specifically for the climate of the region where it’s sold. If puzzling through the label is daunting, the EPA’s Energy Star program makes judging efficiency easier. The label shows how the window performs in three key areas. Fortunately, most new windows sold in the United States carry a label from the National Fenestration Rating Council, a nonprofit organization that certifies energy performance. You can’t judge a window’s efficiency just by looking at it. ![]() Single-Pane Window | Photo by Mark Hooper Evaluating Energy Efficiency Superglass, the most expensive glazing system on the market and one of the best insulators, suspends two layers of Heat Mirror between panes of glass with gas-filled spacers. It’s made by suspending a sheet of low-E film between panes of insulated glass. ![]() “The extra cost is minimal, and it’s really beneficial in the long run,” he says, pointing out that because low-E coatings also filter ultraviolet radiation, they protect furniture, rugs, and artwork from fading.Īnother high-tech glazing system, called Heat Mirror, can match or even exceed the energy efficiency of triple-pane windows - without the extra weight. It’s possible to buy dual-pane glass without a low-E coating, but Tom Silva doesn’t recommend it. That means that depending on the type of fuel used in a home, low-E windows can pay for themselves in 5 to 10 years. While low-E coatings add 10 to 15 percent to the cost of a window, research has shown that they cut energy expenditures by about 25 percent over plain insulated glass. In cold regions, where heating costs dominate, homeowners can choose coatings that maximize the amount of heat transmitted from the outside, called solar heat gain in hot regions, low-solar-gain coatings can keep cooling costs down. Virtually all new windows sold today offer this feature.ĭepending on the climate, low-E coatings can be tailored to let the sun’s energy in or to block it out. Another way is with low-emissivity (low-E) coating, an invisible layer of metallic oxide that reduces the amount of heat that passes through the glass. Triple-panes are excellent performers in extreme northern climates (and good sound- reducers for houses near highways), but the extra pane of glass makes for a very thick, heavy, and expensive sash.Īdding panes and gas-filled spacers is one way to get a more efficient window. More efficient still are triple-pane windows, which seal two layers of gas within the frame. The gas is a poor thermal conductor, so it slows the passage of heat through the glass, eliminating the need for storm windows. Most new windows sold today are dual-pane glass (sometimes called insulated glass or by the formerly trademarked name Thermopane), in which a layer of inert gas - typically argon or krypton - is sealed between inner and outer panes. If you opt for single-pane windows because of their traditional look, choose ones in well-made wood frames, and combine them with snug-fitting storm panels to boost their energy efficiency. That explains why few new single-panes are sold today. Windows with just one layer of glass suck energy dollars from a house and offer little protection against heat or cold. Sorting through the options takes a bit of effort, but it more than pays off in increased comfort and reduced energy costs. Today’s energy-efficient windows come with glazing “systems” that incorporate multiple panes of glass, gas fillings, and high-tech, heat-sensitive coatings. Window glass, called glazing, has come a long way since the days when windows had only a single pane between you and the elements. ![]() Here, This Old House general contractor Tom Silva installs a tilt-in double-hung sash | Photo by Mark Hooper Double-pane insulated glass with low-E coating is a major energy saver. ![]()
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