<human>:  What are the most energy-efficient appliances?
<bot>: The most energy-efficient appliances include refrigerators, dishwashers, washing machines, air conditioners, and water heaters. Modern models of these appliances use less energy than older models, and many are now certified by the Energy Star program to use less energy than the federal government requirements. Other energy-efficient appliances include LED lightbulbs, efficient thermostats, and solar panels.