Keep your heating Btu’s in with money-saving thermal shades, at one-tenth the cost of buying ready-mades…
Article with pictures from BuilditSolar.com about how to use bubble wrap quickly and free if recycled instead of purchased. Good for windows where seeing through is not important (unused guest rooms, attics, etc)
Article with pictures from BuilditSolar.com about how to insulate easily and very effectively storm windows with acrylic sheets at low cost.