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Energy Efficiency may refer to:
A measure of how effectively a system uses energy to perform a task, often expressed as reduced energy per unit output.
A metric used to rate the cooling efficiency of air conditioners and heat pumps, typically expressed in BTU per hour per watt.
A performance metric used in appliance and industrial contexts to quantify energy use and compare efficiency across models or systems.
A well-known building standard focused on achieving very low energy demand for heating and cooling through envelope, ventilation, and controls.