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In the Northeast, where I live, there are lots of older homes with inefficient oil furnaces and drafty, double-hung windows. That makes replacement windows a big business. However, the words "replacement window" mean different things to different people. What most people think of as replacement windows are sash replacements that fit into existing jambs. But there are various other types marketed as replacements, some of them indistinguishable from windows for new construction. To sort through the confusion, I spoke with dozens of contractors, suppliers, and manufacturers. I had several conversations with distributors during which I concluded that they carried the type of window I wanted. But when I finally received their literature, I realized that the product didn't match up with my