Which of the following describes energy efficiency?

Energy efficiency refers to the practice of using less energy to achieve the same outcome or level of service. This principle is central to minimizing energy consumption without compromising performance. For instance, using energy-efficient appliances can significantly reduce the amount of electricity needed for tasks like heating, cooling, or lighting. The main goal is to ensure that the same services are provided with reduced energy input, thereby lowering energy costs and reducing environmental impact.

In contexts such as home heating, energy efficiency measures can include better insulation and more efficient heating systems, allowing a home to stay warm using less energy. This focus on achieving the same result with lower energy use makes energy efficiency a key element in sustainability efforts and energy conservation strategies.