HSPF Rating

HSPF stands for Heating Seasonal Performance Factor. It measures how efficiently a heat pump heats your home over a full heating season — basically, it's the heating version of SEER. A higher HSPF means lower heating bills. Most modern mini splits with inverter compressors have HSPF ratings of 10 or higher, which is significantly more efficient than electric resistance heating. If you're replacing a space heater or baseboard heat, the efficiency difference will show up fast on your utility bill.