Energy-efficient technologies are designed to use less energy while providing the same level of service or output. Examples include LED lighting, which consumes significantly less electricity than traditional bulbs, and Energy Star appliances, which meet strict energy efficiency guidelines set by the U.S. Environmental Protection Agency. These technologies help reduce energy consumption, lower utility bills, and decrease greenhouse gas emissions. In addition to lighting and appliances, energy-efficient technologies also encompass smart thermostats and high-efficiency HVAC systems. Smart thermostats learn user preferences and adjust heating and cooling accordingly, while high-efficiency HVAC systems use advanced designs to maximize energy use. Together, these innovations contribute to a more sustainable future.