save on energy costs with the simple addition of a door sweep that seals the gap between the bottom of an entry door and its threshold. feb 21, 2014 · what is the best door sweep for exterior doors? save on energy costs with the simple addition of a door sweep that seals the gap between the bottom of an entry door and its threshold. door sweeps and bottoms are attached to the bottom of your door to provide a physical barrier, typically rubber, against cold that could seep through the crack between the door. view the brush door sweep 2 x 36 white and more. Shop door sweeps and a variety of hardware products online at lowes. com.
