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SHOPPING FOR SUPERWINDOWS The last time you shopped around for windows, chances are you scrutinized for durability, ease of operation, a tight fit, economy, and good overall service —from delivery to guarantees. Since 1985, however, a host of energy performance options have probably been added to your shopping list. Low-emissivity coatings that significantly cut heating and cooling costs are available from every major wood window manufacturer. Heat Mirror-a low-e film suspended between two panes of glass-can provide even greater savings. A few manufacturers now offer units filled with a gas called argon that further cuts heat loss. By the early 90's, windows that are both low-e coated and gas-filled may have captured over 50 percent of the market. In Europe, you can