HSPF2 (Heating Seasonal Performance Factor 2)
The updated heating efficiency metric for heat pumps under 2023 DOE test procedures. Represents total heating output (BTU) divided by total electricity input (Wh) over a heating season.
Why It Matters
HSPF2 tells you how efficiently a heat pump heats in winter. Federal minimum is 7.5 HSPF2; high-efficiency cold-climate units reach 10-12 HSPF2. Higher is better; it directly affects your winter electricity bills.
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.