I lived in Europe as a kid, and there they have double windows, plus shutters. Not double-pane windows like ours here today, but two separate & parallel sets of windows with a sill in between, which was handy to keep your beer or wine chilled in wintertime.
Anyhow, rather than paying $$$ for new double- or triple-pane windows, why not get a good used set of single-pane windows for cheap or free on Craig's List, and install them parallel to the old ones? (Think permanent storm windows.)
Make workable shutters out of sandwiched Hardipanel and styrofoam, and you get security and keep the inside dark for sleeping, too.
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