Sometimes it can get really cold during the winter months. Fortunately, there are things you can do to your home to counteract cold temperatures. One of these is winterizing windows. If you plan on doing this with plastic sheeting, take these actions to get the best results. Gather Dimensions of Windows The great thing about plastic sheeting is suppliers can cut it for you. That saves you extra steps. However, so that your plastic sheeting is cut the right way, you need to know exactly how big the windows are in your home that you're going to winterize.