EER, which stands for Energy Efficiency Ratio, measures the cooling efficiency of an air conditioner or heat pump at the outdoor temperature of 95°F. Recently, the Department of Energy updated its testing procedure for determining EER, which changed HVAC system ratings to be called EER2. The higher the EER2, the more efficient the system.
SEER measures the efficiency of a heat pump or air conditioner over an entire cooling season. The higher the SEER, the more efficient the system.
BTU, or British Thermal Units, are how to measure the amount of heat required to raise or lower one pound of water by one degree Fahrenheit, and can help determine the right size system for your home.
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