In winter, the Resistance® Glass System transmits the sun's visible light and directs solar shortwave infrared energy into the home. At the same time, its reflect longs wave infrared (heat) energy -- like that which comes from a home's heating system -- back into the room, helping to keep homes warmer. Resistance glass also keeps the room side glass surface of a window warmer than uncoated glass, helping to eliminate that drafty feeling near windows and sliding glass doors. It also reduces formation of condensation on the interior perimeter of the glass surface, which can damage the window sash.Because Resistance® glass also reduces relative heat gain, windows made with this glass help keep homes cooler in summer, too. The result is year-round energy efficiency and comfort. The Resistance® glass system has a very similar look of traditional glass inside and out, so it is appropriate for any home design. The glass is transparent and barely visible, permitting high amounts of sunlight in and allowing interior colors to remain true.

The glass also reduces transmittance of ultraviolet light, which contributes to the fading of fabrics, rugs, draperies and furniture.The Resistance® Glass System has revolutionized the industry by making an insulated glass unit that performs better than 5 panes of glass put together. Resistance even performs better than the traditional Low-E and Argon and even better than fiberglass insulation that is stuffed in between your walls.Let us prove it to you. Read customer reviews of our resistance glass system, or call us today for a free no-obligation consultation. See What Installations We've Done Near you View Our Recent Work Get a Free Estimate for Your Home Improvements Schedule Your Free EstimateJust because windows or doors are Energy Star-labeled doesn’t mean they’re eligible for a federal tax credit. And with costs running about $500 to $1,000 per window including labor, it’s wise to know something about the scientific lingo and numbers on the product labels you’re likely to encounter. 

Here’s your pro-level label-decoding guide so you can be sure you’re buying qualified products.The two labels you should look for: The U.S. Department of Energy’s blue-and-yellow Energy Star label, which specifies the climate zones the product is certified for, and the white National Fenestration Rating Council label. Nonprofit NFRC is the industry-recognized certifying body for windows and doors. It reports raw numbers only; wooden storm door latchEnergy Star tells you whether those numbers constitute superior performance, putting its seal of approval on those products that meet its standards.french door refrigerator 27 inches deepTo confuse matters, DOE has issued a blue label that manufacturers can use to signify that a product qualifies for the tax credit. patchwork dog door stop pattern

But DOE doesn’t require that manufacturers include it. For windows or doors to qualify for the credit, two NFRC-supplied measurements must each be equal to or less than 0.3, regardless of climate: U-factor and solar heat gain coefficient (SHGC). You must also have the manufacturer’s signed statement that the product complies with IRS requirements. This either comes with purchase or can be downloaded from the manufacturer’s website.garage door automation londonDon’t be swayed by ratings the manufacturer may post on its own label. andersen storm door strike plateA window or door’s frame and other components (weather stripping, sidelights, transoms) can significantly affect its energy efficiency, so NFRC measures based on the entire unit, not just the window glass or door slab alone. patio door curtains with grommets

Manufacturers, on the other hand, sometimes report values that don’t take the entire unit into account, according to Energy Star.The NFRC label typically lists five measurements, including the tax credit-critical U-factor and SHGC. The other three are somewhat less important to energy performance, according to Energy Star, but can help you judge how well a window or door will perform in a particular application—for example, whether it’ll let in enough light.Where you live affects which measurements are most important, but the tax credit requirements are uniform across the country. There are four Energy Star climate zones, differentiated by whether heating, cooling, or a mix of the two is most critical to energy performance.The lower the number, the better an insulator the window or door is.Tax credit qualification requirement: 0.3 or lessEfficient Windows Collaborative climate recommendations:2. Solar Heat Gain Coefficient (SHGC)The lower the number, the less solar radiation—and heat—the window or door allows inside.

Tax credit qualification requirement: 0.3 or less SHGC refers to the solar radiation a window or door allows inside. Seek the lowest possible SHGC rating in warm climates to minimize the use of air conditioning. Look for a slightly higher number in cooler climates so that the sun can help heat your home in winter, but be sure to balance SHGC with an efficient U-factor for your area.Lower number means the room will be dimmer; a higher number means the room will be brighter.Tax credit qualification requirement: none This number applies to windows or doors with windows only. Visible transmittance is the amount of light a window allows to pass through. With older window glazing techniques, VT and solar heat gain were basically the same; the brighter a room, the hotter it got. But new technologies allow windows to let in lots of light while the room stays cool. Consult VT numbers if you’re looking to reduce glare in a room or fill it with natural light, but be warned that a very low VT may mean you have to use artificial lighting even during the day.

Range: N/A, but .0.3 is standard building codeThe lower the number, the more airtight the window or door.Tax credit qualification requirement: noneThis number, expressed in cubic feet per minute per square foot of window/door area, represents the amount of air that the window or door’s frame allows to pass through. Energy Star standards don’t consider air leakage because it’s difficult to measure accurately and can change over time as frame materials expand, contract, or warp in place, according to the EWC. Still, this measurement can help you compare similar products, especially if they’ll be buffeted by the elements.The lower the number, the more condensation the window or door allows to build up.Tax credit qualification requirement: none  Condensation resistance is a measure of how much moisture a window or door allows to build up on the surface (which can drip onto wood and cause mold or discoloration) or between glazing layers (which can’t be clean and blocks your view).