WHAT IS HSPF?
Heating Seasonal Performance Factor
What is a good HSPF rating?
A good hspf rating is between 8-10. Trane’s variable speed heat pumps have about 10 HSPF, some of the highest in the industry. Because heat pumps are used to both heat and cool your home, you should also look for a SEER rating of 12 or higher on heat pumps to make sure they are also efficient for cooling.