Why it matters to you
Houston logs roughly 1,266 heating degree days a year against 3,288 cooling degree days, so for most local heat pump owners SEER2 drives more of the annual electricity use than HSPF2 does. HSPF2 still matters on cold snaps, and by rating arithmetic an 8.5 HSPF2 heat pump uses about 12% less electricity than a 7.5 HSPF2 one for the same heating (1 − 7.5/8.5).
Practical guidance
Compare HSPF2 and SEER2 together from the AHRI Directory listing for the exact matched system on your quote. Ask how the system handles the coldest nights, including when auxiliary heat strips turn on, since heavy reliance on them erodes the heating efficiency the rating describes.
How HSPF2 options compare
| HSPF2 rating | Where it sits | Heating electricity vs. 7.5 HSPF2 for the same heat (rating arithmetic: 1 − 7.5/x) |
|---|---|---|
| 7.5 | Federal minimum, split-system heat pumps | Baseline (0%) |
| 8.0 | Above the minimum | About 6% less |
| 8.5 | Mid-efficiency tier | About 12% less |
| 9.0 | Higher-efficiency tier | About 17% less |
| 10+ | High-efficiency tier | About 25% less at 10; more above 10 |
What is the minimum HSPF2 for a new heat pump in Texas?
The federal minimum for a new split-system heat pump is 7.5 HSPF2, and it applies nationwide, including Texas, for equipment made on or after January 1, 2023. The same heat pump must also meet the 14.3 SEER2 cooling minimum. Packaged heat pumps have their own separate minimums.
How much does a higher HSPF2 cut heating electricity?
The rating arithmetic is 1 − (7.5 ÷ new HSPF2) for the same heating load. That gives about 6% less at 8.0, about 12% less at 8.5, about 17% less at 9.0 and 25% less at 10. In Greater Houston, where heating demand is modest, those percentages apply to a smaller share of the year's total HVAC use than SEER2 gains do.
Should Houston homeowners prioritize HSPF2 or SEER2?
For most Greater Houston homes, SEER2 deserves more weight because cooling degree days outnumber heating degree days about 2.6 to 1. HSPF2 becomes more important if your home has no gas furnace backup, you keep the house warm in winter, or you want strong performance through occasional hard freezes.
Is HSPF2 the same as the old HSPF rating?
No. HSPF2 uses the newer M1 test procedure, so the same heat pump scores lower in HSPF2 than in the older HSPF. That is why today's 7.5 HSPF2 minimum looks lower than older HSPF figures without being a weaker standard. Compare HSPF2 only with HSPF2.
Sources
- eCFR, 10 CFR 430.32 — Energy and water conservation standards
- U.S. Department of Energy, 2023 Central Air Conditioner and Heat Pump Standards FAQ (October 5, 2022)
- NOAA NCEI, U.S. Climate Normals 1991–2020, Houston Intercontinental Airport (USW00012960)
- AHRI Directory of Certified Product Performance