How many NC State engineering students does it take to replace an inefficient light bulb with an energy-efficient one?
Five: Three to design a nuclear-powered light bulb that never needs changing, one to install it, and one to write the computer program that controls the wall switch.
Energy Efficiency Tip
Check your water heater thermostat. Many manufacturers set thermostats to 140 degrees, although most households only need a setting of 120 degrees. Each 10 degree drop in water temperature can save you between 3 and 5 percent in energy costs.