4. You can refinish your old windows. Your crummy window salesman can squirm and kick as much as he wants to refute this one, but its true. I wish I had known this years ago. If you are handy, adventurous, and care about the environment, you can refinish your old windows. The “Old House Authority” says “Repairing, rather than replacing, wood windows is most likely to be the “greener option” and a more sustainable building practice” Here is a great video on how you can do this yourself.