To keep an electric baseboard heater energy-efficient and safe, it's essential to regularly clean the heater to remove any dust or debris that could block air flow and cause an odor problem or even a fire. Avoid placing rugs or any flammable materials near the heater and ensure it is not blocked by furniture to allow for proper air circulation. Regular checks of the heating element for any signs of wear or damage and monitoring for any unusual smells or noises can also help detect potential issues early. Lastly, considering the size of the room when setting the temperature can contribute to energy efficiency; smaller rooms might require slightly different temperatures compared to larger rooms.