Some of the biggest energy losses for many homes are gaps where heated or air conditioned air escapes. Don’t pay to heat or cool the great outdoors. Grab a helper and a flashlight at a time when you can make your house completely dark. Shine the flashlight along the seals of doors and windows and ask your helper to tell you if the light is shining through any spaces around closed doors. Anywhere that the light can go through, air is certainly escaping. Fortunately, it’s easy to pack a bit of self-adhesive rubber foam weatherstripping in these locations. Whether you’re adding new weatherstripping or replacing old, you should experience some cost savings for your efforts.