Energy Efficiency Ratio (SEER)
From Swikipedia
Introduction
Energy Efficiency Ratio (EER) is a measure of how efficiently a cooling system will operate when the outdoor temperature is at a specific level (95oF). The higher the EER, the more efficient is the system.
In technical terms, EER is the steady-state rate of heat energy removal (i.e. cooling capacity) by the product measured in Btu-h divided by the steady-state rate of energy input to the product measured in watts. This ratio is expressed in Btu-h/watt.
Seasonal Energy Efficiency Ratio (SEER) is the total cooling output of an air conditioner during its normal annual usage period for cooling, in Btu/h, divided by the total electric energy input during the same period, in watt-hours. In simple words, it is the measure of the energy efficiency of the air conditioner. Just like the EER, similar is the case for SEER, i.e., the higher the unit’s SEER rating, more energy efficient it is.
References:
http://en.wikipedia.org/wiki/Seasonal_energy_efficiency_ratio
http://energystar.custhelp.com/cgi-bin/energystar.cfg/php/enduser/std_adp.php?p_faqid=3041
