Using a dishwasher instead of washing by hand is actually a more energy- and water-efficient way to clean up. But you can make using the dishwasher even more efficient with these two simple tricks. If your appliance has something called a "booster heater," turn down the thermostat. A 120-degree setting can save energy, and, since your dishwasher doesn't have to heat water, it'll save water and reduce the washing time. Also, opt for the no-heat drying feature, too. This will let you open the dishwasher to let it air-dry. You can use a soft towel to hand-dry to get glasses streak-free, too.