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Energy Efficiency
Energy efficiency compares useful energy service with energy input; a more efficient product delivers the same service using less energy.
Energy efficiency describes the energy service delivered relative to the energy used to provide it. An efficiency improvement delivers the same useful service, such as lighting or heating, with less energy input.
The appropriate measure depends on the equipment and service being compared. Lower total energy use by itself does not establish better efficiency if the amount of useful service also changed.
Source: U.S. Department of Energy: What Is Energy Efficiency?.
Frequently Asked Questions
Does a lower energy bill alone prove an efficiency improvement?
No. Efficiency compares energy input with the useful service delivered. A bill alone does not establish that comparison.
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