SEER2, EER2 and HSPF2: compare the right metric
Direct answer: SEER2 is a seasonal cooling-efficiency rating, EER2 describes cooling efficiency under a specified test condition, and HSPF2 is used for seasonal heating efficiency of heat pumps. They help compare rated equipment performance, but they do not guarantee a specific household utility-bill saving.
Why the “2” matters
Current U.S. equipment uses the newer SEER2/EER2/HSPF2 test framework. When comparing proposals, make sure both contractors are quoting the actual rated matched system rather than mixing old and new terminology.
What the rating does not tell you
- Whether the equipment is correctly sized for the home.
- Whether ductwork and airflow are adequate.
- How much your specific utility bill will change.
- Whether a higher efficiency tier has the best payback for your ownership horizon.
FAQ
Is a higher SEER2 always better?
It represents higher rated seasonal cooling efficiency, but the best purchase depends on climate, usage, price premium, system match and installation quality.
Can I compare an old SEER number directly with SEER2?
They come from different test procedures, so treat the terminology carefully rather than assuming the numbers are directly interchangeable.
Related decisions
HomeQuoteCheck explains rating terminology; it does not predict a home's energy savings or recommend a specific efficiency tier.