Newsday Feature

About 63 million windows are sold annually in the United States, nearly 70 percent of which are replacement windows. With countless products on the market, how can a consumer pick a good window?

First, find out if the window is certified by the National Fenestration Ratings Council. Its glass should also have an Energy Star seal of approval.

"I tell people if it's not NFRC, don't buy it," says John Kypreos of Tri-State Window Factory in Deer Park. (The Web site,, lists products and details its rating system.)

Next, make sure the window has some type of frame-reinforcement properties, says Bob Nyman of Crystal Windows in Queens. "Vinyl frames should be reinforced in some manner," he says.

Finally, Trent Winfree of Andersen Windows advises consumers to consider warranties. "Andersen has a 20-10 warranty, 20 years on the glass, 10 on the frame," he says.

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