Door or Window Double Draft Stop – The Frost King Double Draft Stop actually insulates the inside and outside of a door or window at the same time. It blocks out drafts and dust; reduces energy loss. So it saves energy and saves money. Installation is quick and easy. Just slide it under the door or close the window on it. Image 1 During winter, you don’t want your home to be hard to heat. A single draft from a door or a window can drive up heating costs. If your window doesn’t shut properly, place our Double Draft Stop between the window bottom and frame. This should help keep wind flow out from sneaking in under your window. Of course, an extra Double Draft Stop is perfectly made to keep the wind from whistling in underneath your door. Use it to not only keep the cold out, but also keep the heat in. For cutting heating costs. For keeping the cold out. For eliminating dust and dirt that blows into your house. Frost King’s Door Draft Stops—including the Double Draft Stop—is a must have for winter home improvement.