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SEER, EER Ratios and HSPF Measurements

Seasonal Energy Efficiency Ratio (SEER)
SEER is most commonly used to measure the efficiency of a central air conditioner.  SEER measures how efficiently a cooling system will operate over an entire season.  The higher the SEER, the more efficient the system. 

Energy Efficiency Ratio (EER)
EER is a measure of how efficiently a cooling system will operate when the outdoor temperature is at a specific level (95°F).  The higher the EER, the more efficient the system.

Heat Seasonal Performance Factor (HSPF)
HSPF is the most commonly used measure of a heat pumps heating efficiency.  The higher the HSPF, the more efficient the heat pump.
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