There are a number of ways that you can use to supplement your heating system. Supplementing your heating system may come in handy, especially during the winter when there are power outages. The main method of supplementing the heating system in your home is using a fireplace. For rooms that are hard to heat, a fireplace would not be able to heat the entire room. Therefore, a space heater is better suited to heat up the area of the room in which one is.