SEER vs HSPF Calculator — Heat Pump Savings
What is the difference between SEER and SEER2?
SEER2 is the current efficiency metric (effective 2023) that replaced SEER. It uses the same ratio of seasonal cooling output to energy input but tests under higher external static pressure, which better reflects real ductwork. SEER2 numbers run roughly 4.5% lower than the old SEER for the same equipment, so do not compare a SEER rating directly against a SEER2 rating.
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Use the SEER vs HSPF Calculator — Heat Pump Savings to get an exact answer for your inputs.
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