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Efficiency Ratings

There are several different methods to measure the efficiency of HVAC systems, including Cooling Capacity, Seasonal Energy Efficiency Ratio (SEER), Energy Efficiency Ratio (EER) and Integrated Part-Load Value (IPLV).

Cooling Capacity

The cooling output of an air conditioner.

Seasonal Energy Efficiency Ratio (SEER)

This is the cooling output provided by the unit during its normal annual usage period, divided by its total energy consumption. The higher the SEER rating, the more energy-efficient the system.

Energy Efficiency Ratio (EER)

This measures the cooling output of a unit divided by its total energy consumption, measured during continuous operation at a given operating condition (95 degrees or full load).

Integrated Energy Efficiency Ratio (IEER)

This measure expresses cooling part-load EER efficiency for commercial unitary air conditioning and heat pump equipment on the basis of weighted operation at various load capacities.