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Window technology has come a long way in recent years. With the increase of energy costs (what it takes to heat and cool your home) the demand for ‘better’ windows has increased. It has become common knowledge that most of the energy loss in your home is through your windows and doors. There only a few questions you need to ask to become a more knowledgeable consumer when purchasing replacement windows for your home. One, what is the U-Factor assigned to the window by the National Fenestration Rating Council (NFRC)? And two, what is the Air Infiltration Rating given to the window by the American Architectural Manufactures Association (AAMA)? Any numbers given to you that are not supported by these two firms are marketing fluff, aimed at making a company’s window look better or more superior then it actually is. The NRFC lists all certified results of every manufactured window it tests for Thermal Performance. The U-Factor they assign to windows is for the overall energy efficiency of that particular window (including the frame, sashes, glass package, size, style, etc.). The lower the U-Value the more energy efficient the window. The glass package that you choose (i.e. Triple-Pane versus Double-Pane windows) can greatly affect the U-Factor of the window. For example, our window’s double-pane U-Factor is 0.28; Triple-Pane U-Value 0.16. The Triple-Pane window is nearly twice as energy efficient. The AAMA is an institution that certifies products after they are confirmed by third-party testing labs to meet industry standards. AAMA sets the rules for testing the performance of building products like windows. Among the most important of these measurements are air infiltration, water leakage and structural window performance. The most important of these numbers is Air Infiltration; how much air a window leaks into your home. Our window has an Air Infiltration rating of 0.01 for both double-pane and triple-pane. The glass package you select will not affect the air infiltration rating. As savvy consumers we always like to compare apples to apples when making purchasing decisions. When purchasing windows you want your windows to make your home more comfortable. By asking these simple questions you will be able to judge the quality of the window with the price given and make the best choice for the window that best suites your home and budget. At Builders & Remodelers, we offer a wide variety of replacement windowsContact us today to learn more about how replacing the windows in your home can reduce your carbon footprint and save you money. On the Level Adam Bressler Builders & Remodelers