TL;DR
HSPF2 is the federal heating-efficiency metric for heat pumps adopted in 2023, the seasonal heat output in BTUs divided by watt-hours consumed, measured under the revised M1 test procedure with higher static pressure that mimics real ductwork. Numbers read lower than the old HSPF, roughly 15 percent, so a 7.5 HSPF2 unit resembles an 8.8 HSPF unit; the current federal minimum for split systems is 7.5 HSPF2.
What it means
HSPF2 is the federal heating-efficiency metric for heat pumps adopted in 2023, the seasonal heat output in BTUs divided by watt-hours consumed, measured under the revised M1 test procedure with higher static pressure that mimics real ductwork. Numbers read lower than the old HSPF, roughly 15 percent, so a 7.5 HSPF2 unit resembles an 8.8 HSPF unit; the current federal minimum for split systems is 7.5 HSPF2. Utility rebates and tax credits key off this rating, which appears on the yellow EnergyGuide label.
Where it sits in the glossary
HSPF2 is part of the Certifications group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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