Need for SEER

• The SEER standard was adopted by the U.S. government to create a uniform energy efficiency standard. It would clarify energy efficiency regulation for manufacturers and help consumers make informed choices about how to build energy-efficient cooling systems.
  
  

Formula

• SEER is intended to make it easy to compare the relative efficiency of air conditioning systems. The formula for SEER is the sum of the cooling output over the cooling period divided by the sum of the electrical energy inputs over the cooling period. The cooling output is measured in BTUs (British Thermal Units). The energy input is measured in watt hours.
  
  

Relationship Between EER and SEER

• The EER stands for Energy Efficiency Ratio. It gives the ratio of cooling output to electrical power input. The EER has the same units as the SEER; however, the SEER gives the predicted average performance over a given period, usually a year. The EER gives you a measure of efficiency only at one specific time, with one specific level of temperature or humidity.
  
  

Relationship Between COP and SEER

• COP stands for Coefficient of Performance. The COP describes the maximum possible theoretical efficiency of an air conditioner. The COP is found by dividing the absolute indoor temperature by the difference between the absolute outdoor temperature and the absolute indoor temperature. In this context "absolute" means the temperatures are measured in the Rankine or Kelvin temperature scale rather than degrees Fahrenheit or Celsius. The EER is found by multiplying COP by a factor of 3.413.