The Energy Efficiently Rating (EER) is determined by The Air Conditioning and Refrigeration that equals the ration of cooling capacity in BTUs to the power input in watts. This rating determines the state of the air conditioner when it is up and running.
Seasonal Energy Efficiency Rating (SEER) is commonly used to measure central and ductless air conditioning. The SEER is defined as the total cooling output (in British thermal units or Btu) provided by the unit during its normal annual usage period divided by its total energy input (in watt-hours) during the same period.
Why is air conditioner efficiency currently an issue?
The Clinton Administration improved the air conditioner efficiency standard from SEER 10, which was established by Congress in 1987, to SEER 13. The change from SEER 10 to SEER 13 represented a 30 percent improvement in energy efficiency. The Clinton Administration decision required all new air conditioning equipment sold in the United States to comply with the SEER 13 standard by January 2006. In April 2001, however, the Bush Administration addressed the possibility of weakening the standard to SEER 12, and in July, DOE formally proposed to roll back the standard.