SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ratio of cooling Capacity to energy consumed in watts-hours.
EER: Energy Efficiency Ratio (EER) is a measure of how efficiently a cooling system will operate when the outdoor temperature is at a specific level (95 degrees F). The higher the EER, the more efficient the system. In technical terms,(Correction) OR It is the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.