I currently have one baseboard heater in my bedroom, I wanted to add another heater because it gets very cold and I have two exterior walls and only one heater. Will I be consuming more energy because I'm adding an additional heater?
The question doesn't mention how your home is heated, but the general answer to this is yes. A forced air furnace will use more gas. An electric baseboard heater will use more electricity. A hot water/steam system will use more electricity/gas depending on how it's powered.