Heat Pumps & Mini-Splits

What Is HSPF2 (Heating Seasonal Performance Factor 2)?

Definition

HSPF2 is the standardized seasonal efficiency rating for a heat pump's heating mode, tested under the same 2023 DOE update that produced SEER2 — replacing the older HSPF rating. Higher HSPF2 means more heat delivered per dollar of electricity across a full heating season.

Why it matters for your home

Energy Trust of Oregon's ducted heat pump rebate requires HSPF2 7.5+ (its ductless mini-split rebate requires HSPF2 8.10+) — meeting or beating that number is the difference between qualifying for $1,000-$3,000 and getting nothing.

What to do about it

Get the HSPF2 number in writing on any heat pump bid and check it against the current rebate table before you sign — a slightly lower-rated model can cost more once the rebate gap is factored in.

Money term — the details

What HSPF2 rating qualifies for Oregon rebates?

As of this writing, Energy Trust requires HSPF2 7.5+ for a standard ducted heat pump rebate and HSPF2 8.10+ for its ductless mini-split rebate — see the rebates & incentives guide for the current, sourced figures.

How is HSPF2 different from the old HSPF rating?

Like SEER2, HSPF2 uses a revised, more realistic duct-static-pressure test, so HSPF2 numbers typically read a bit lower than the old HSPF rating for equivalent real-world performance.

See it in context Heat Pump Installation & Replacement

Sources

Energy Trust 2026 Oregon Residential Incentive Information Sheet (PI 320I)

This definition is pending licensed-trade technical review. It's sourced from our own published service and guide content, not invented — but hasn't yet been signed off by a licensed HVAC reviewer.

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