What is SEER
SEER = Seasonal Energy Efficiency Ratio, this ratio is also used to indicates the relative amount of energy needed to provide a specific cooling output. It is expressed in BTU/Whr
SEER represents the expected overall performance for a typical year's weather in a given location. It is calculated with the same indoor temperature, but over a range of outside temperatures from 65 °F (18 °C) to 104 °F (40 °C), with a certain specified percentage of time in each of 8 bins spanning 5 °F (2.8 °C). There is no allowance for different climates in this rating, which is intended to give an indication of how the EER is affected by a range of outside temperatures over the course of a cooling season.
SEER = (1.12-√(1.2544-0.08*EER)) / 0.04