4. Shut Off The Lights

While modern lightning, like compact fluorescents and LEDs, are more efficient, incandescent light bulbs can produce as much heat as they do light. Energy Star-rated light bulbs produce 75% less heat, so consider that when replacing bulbs. It's always a good idea to shut off lights to save energy, and on hot summer days, it can also affect the temperature of the room. The same goes for many electronics, so consider unplugging any device that isn't needed, since even in standby mode, many electronics remain hot.