If you close off some rooms in your home and don't heat those rooms, then you won't need to worry as much about those windows. Focus on the rooms in your house you actual use and heat. Most importantly, focus on the windows that have the most drafts.
Once you determine which windows you want to winterize, you can easily purchase Duck Indoor Shrink Plastic Film Window Kits at any discount store. They sell for about $10 a box. Once you've gotten those, you are on your way to keeping out the cold air in no time.
It also helps to purchase a heater that runs on as little electricity as possible. You can find those in the same discount stores. Why bother spending money on oil or gas heat if that is not needed? Even if saving money is not your top priority, staying warm this winter should always be important.
Adding the plastic to your windows will make you home much warmer, and in no time, you will find your heating bill goes down. I've been applying plastic to my windows for a few years now and it makes a major difference.
