New windows can insulate better than most walls, and some can even survive being hit with a two-by-four shot from a cannon ...

Some double-hung windows in our tests are better than others ... including low-emissivity (low-E), argon-filled, and triple-pane glass. They’re sold at independent home centers.

It used to be that window glass replacement on a broken double-paned window was a cheap fix—a piece of glass, some glazing compound and a few minutes of work—and then tell the kids to play ...