Switch to CFL or LED lights
A relatively cheap and easy way to reduce your environmental footprint is to switch to CFL or LED lights. On average, the EIA reports that home lighting accounts for 9% of monthly residential electricity consumption.
Why is it cool?
Compact fluorescent lamps (CFLs) and light-emitting diodes (LEDs) not only cost less to use, but they both have a longer lifespan than most traditional bulbs (typically, both CFLs and LEDs last longer 10-25 times longer than incandescent bulbs!), which can greatly help in the fight to conserve energy. Plus, LED and CFL lights produce less heat, which helps give your air conditioner a break during the summer