Space Heater
Besides being a safety hazard, a space heater is an energy hog. The average one uses 1,500 watts of energy — a cost of 15 cents per hour.
Rather than using a space heater to keep a space warm, address the underlying issue. You might need additional insulation in the room you’re trying to heat, or you might be able to block drafts by sealing around doors and windows. Either way, staying warm in the winter is the perfect spring DIY project.