Answer :
Final answer:
The efficiency of room air conditioners is measured using the Energy Efficiency Rating (EER), which is expressed in Btu per hour divided by power input in watts, with higher values indicating greater efficiency.
Explanation:
The system used to measure the efficiency of room air conditioners is known as the Energy Efficiency Rating (EER). The EER is used as a common standard to compare the energy efficiency of different air conditioning units and is expressed in a somewhat non-standard unit of British thermal units (Btu) per hour divided by the power input in watts.
An EER rating of about 10 Btu/watt-hour is typical for residential air conditioners, and higher EER values indicate greater energy efficiency. Countries like Australia, Canada, New Zealand, and the U.S. also use an Energy Star Rating, which ranges up to 5 stars—the more stars, the more energy-efficient the appliance. The higher the EER, the less it costs to operate the air conditioner, although the initial purchase price may be higher.
