Incandescent bulbs are not energy-efficient because they waste most of the energy they consume as heat.

Energy-efficient technologies can reduce energy consumption, lower utility bills, and increase comfort by providing better insulation, lighting, and appliances.

Energy-efficient building design involves using natural light, energy-efficient windows and doors, and energy-efficient appliances and equipment to reduce energy consumption.

An energy audit is a comprehensive assessment of a building's energy use, which identifies areas where energy is being wasted, recommends energy-efficient improvements, and estimates the cost of these upgrades.

Energy-efficient transportation technologies include electric vehicles, hybrid vehicles, and fuel-efficient vehicles, which all use less energy to operate than traditional gasoline-powered vehicles.

Energy-efficient industrial processes can reduce energy consumption, lower production costs, and increase productivity by using more efficient equipment and processes.

Energy-efficient agricultural practices include using drip irrigation, energy-efficient farm equipment, and renewable energy sources to reduce energy consumption and improve sustainability.

Energy-efficient technologies in commercial buildings can reduce energy consumption, lower operating costs, and increase occupant comfort by providing better insulation, lighting, and appliances.

Energy Star appliances are designed to use less energy than conventional appliances, making them more energy-efficient.

Energy-efficient technologies in industrial processes can reduce energy consumption, lower production costs, and increase productivity by using more efficient equipment and processes.

LED lighting is the most energy-efficient lighting technology, using up to 80% less energy than incandescent lighting.

Energy-efficient technologies in transportation can reduce energy consumption, lower transportation costs, and reduce air pollution by using more efficient vehicles and fuels.

Heat pumps, Energy Star air conditioners, and Energy Star furnaces are all energy-efficient heating and cooling technologies that use less energy to operate than conventional systems.

Energy-efficient technologies in agriculture can reduce energy consumption, lower production costs, and increase crop yields by using more efficient equipment and practices.

Solar water heaters, Energy Star water heaters, and tankless water heaters are all energy-efficient water heating technologies that use less energy to heat water than conventional water heaters.