SEER2 (Seasonal Energy Efficiency Ratio 2)
The updated cooling efficiency metric for air conditioners and heat pumps, measured under 2023 DOE test procedures with higher external static pressure (more realistic conditions).
Why It Matters
SEER2 numbers are ~5% lower than old SEER ratings for the same equipment due to stricter testing. The federal minimum for central AC/heat pumps varies by region (13.4-14.3 SEER2). High-efficiency units reach 20+ SEER2.
Related Topics
Related Terms
COP (Coefficient of Performance)
The ratio of heating or cooling output to electrical energy input for a heat pump. A COP of 3.0 means the system produces 3 kWh of heat for every 1 kWh of electricity consumed.
Heat Pump
An efficient HVAC system that transfers heat rather than generating it, providing both heating and cooling. Air-source heat pumps are most common; ground-source (geothermal) are most efficient.