Energy efficiency
Energy efficiency is the measure of the amount of energy used to accomplish a purpose, such as heating a room. Energy efficiency is optimal if the benefit can be achieved with minimal use of expended or renewable energy and without any loss. The more energy efficient a device is, the more it conserves energy, cuts costs and reduces climate-damaging CO₂ emissions.
Electrical appliances are divided into energy efficiency classes ranging from green for very efficient to red for inefficient. For houses, energy efficiency refers to the relationship between system technology, thermal insulation and building sealing. Similarly, there are energy efficiency classes for power generators and heaters, which provide information on how efficiently these utilise their respective fuels. Renewable energies are CO₂-neutral, but are not the most efficient form of energy. Combined with conventional heating systems, they significantly reduce the use of fossil fuels and lower pollutant emissions. Energy-saving laws and government subsidies seek to promote the replacement of energy-inefficient appliances with energy-efficient ones.
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