Indow Windows could be a game changer for homeowners looking to reduce their energy costs and increase their home’s insulation. Popular Mechanics’ editor-in-chief Ryan D’Agostino, reviews Indow Window inserts. While easy to install, D’Agostino says they actually work too:

It's an acrylic sheet, laser-measured to fit each window, ribbed with compression tubing that squeezes into the window frame, sealing cold air out and keeping warm air in. Once you pop them in (no hardware required), you don't even notice them. It's the kind of ridiculously simple invention that you think must have been invented before. I used them only this past winter, so I don't have multiple seasons of research to compare, but the U.S. Department of Energy found that Indows led to a 20 percent reduction in energy costs in a sample home, and a separate, larger study found a 19 percent reduction.

Read more >