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Home and Garden Winter P2

Some higher-end windows also contain other insulators such as heat-mirror film that more than double their insulating properties to R-9 or higher. Better-quality windows are beneficial in sunny Colorado, where you want to block hot summer sunlight but let in warm winter sunshine. Triple-paned windows insulate your home and reduce street noise better than double-paned windows, but they can cost about 50 percent more. Do your math to make sure the extra expense is justified. Gas Fillers. | coating that reflects up to 70 percent of heat energy while allowing in visible light generally giving it an R-factor of around 4. Some higher-end windows also contain other insulators such as heat-mirror film that more than double their insulating properties to R-9 or higher. Better-quality windows are beneficial in sunny Colorado where you want to block hot summer sunlight but let in warm winter sunshine. Triple-paned windows insulate your home and reduce street noise better than dou-ble-paned windows but they can cost about 50 percent more. Do your math to make sure the extra expense is justified. Gas Fillers. The spaces between double- and triple-paned windows can be filled with regular air or inert gases such as argon and krypton. Inert gases are odorless colorless and nontoxic plus they reduce heat transfer. Argon for example has about 33 percent less thermal conductivity than air. Visible Transmittance Number. The visible transmittance VT number on your window s label indicates how much light the glass lets through. VT values can range from 0 to 1 but most VT values fall between 0.3 and 0.8. The higher the number the cleaner the glass. Air Leakage. Different styles of windows have different rates of air leakage. Hinged windows generally offer the lowest leakage rates but look for an air leakage rate of less than 0.3 which is the standard in most areas. Energy Star Standards. The U.S. Department of Energy has proposed stricter Energy Star standards that are expected to be phased in starting in late 2009 and fully implemented by 2013. Among other things the new rules will incorporate more specific regional guidelines for windows dividing the country into six territories instead of four and placing Colorado in three zones rather than two. If you want the most energy-efficient windows available for our area some manufacturers including New Windows for America in Northglenn and Accent Windows in Westminster sell products that already meet or exceed the new .