We want to replace or reglaze our 1966 Colonial’s three bow windows, which have single-pane glass puttied into wooden frames. Each window has seven panes 21½ inches wide by 17½ inches tall and two slightly smaller sections that open. The wood is in good shape, but the windows are drafty, and we get lots of condensation when the weather first turns cool in the fall or during cold snaps. Every solution that regular window replacement companies propose — usually vinyl — would totally change the look. At least a third of the open area would be obscured by wide vinyl mullions and rails. How can we upgrade these windows while keeping close to the look of the originals, which we love?