Just like a garage, basements can become areas where you're saying hello cold air, good-bye money! This is because when cold air fills a basement, the floor above it becomes cold and can actually lower the tempature in that room. To avoid this, you need to install proper insulation at your windows. This can be an easy task.
In this tutorial, you'll find out just exactly how to do it. So check it out, good luck, and enjoy!