A lot of people buy a space heaters as a supplement to their existing heating system in order to conserve energy. There is a large variety of space heaters available in many different types so it's important to find out what kind of space heater is best suited for your requirements.
A large part of the heater selection process should include where you're going to place the unit. Some electric heaters are meant for larger rooms and some are meant for smaller, so be sure to check out the heater guide at Air-n-Water for some helpful suggestions.