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Caulk strips also work fine, but those can mess with the finish on some windows so you need to be careful when choosing what caulk strips you want.
You also have the option to have plexiglass panels that are held on by magnetic strips that can be taken down when you need the window open and placed back up when you want the warmth. Bit more expensive then the shrink kits, but less then new storms. Check out this web site for a bit more on these systems. perhaps they can be used where you want to open windows, and purchase the shrink kits for those that can stay closed. http://www.windowsaver.com/