How can I make my apartment more energy efficient?
You can caulk around the windows if they are drafty. You can also put plastic over the windows to prevent them from letting in air. You can change your lightbulbs to the cfl or energy saving bulbs instead of standard bulbs. You can change your appliances if that is an option. Also, try using special curtains that block out air or heat and are also sound proofing. Turn out lights and unplug things that are not in use. These are just a few ideas,
There are tons more!
