If you have a historical home, you typically spend gobs of money replacing drafty windows. Portlander Sam Pardue wasn't happy with that option, so the serial entrepreneur created the Indow window insert:
a custom acrylic panel that fits into an existing interior window frame.
The panels are made in Portland, and they help reduce noise and energy loss by about 20 percent for a typical Seattle home, according to the U.S. Department of Energy. That's comparable to a high-end replacement window. The only catch: you can't open your windows unless you pop out the inserts. But even that is a cinch.