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- Dictionaryen·er·gy ef·fi·cien·cy ra·ti·o
noun
- 1. the ratio of a heating or cooling system's output, per hour, in British thermal units to the input in watts, used to measure the system's efficiency.
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noun
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Minimizing the amount of energy used for a given, constant energy service
Efficient energy use, or energy efficiency, is the process of reducing the amount of energy required to provide products and services. There are many technologies and methods available that are more energy efficient than conventional systems. For example, insulating a building allows it to use less heating and cooling energy while still maintaining a comfortable temperature. Another method is to r... Wikipedia