What Is SEER2? The New AC Efficiency Standard Explained
In January 2023, the federal government updated AC efficiency standards and changed the rating system from "SEER" to "SEER2." If you're buying a new AC or furnace, you'll see SEER2 numbers everywhere now — here's what they mean and why the change happened.
SEER vs. SEER2: What Changed
The old SEER (Seasonal Energy Efficiency Ratio) was calculated under somewhat favorable test conditions. SEER2 uses a more realistic test procedure (the M1 test method) that includes more external static pressure — essentially simulating real-world ductwork resistance better than the old test. SEER2 numbers are about 5% lower than equivalent SEER numbers.
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| Old SEER Rating | Approximate SEER2 Equivalent |
|---|---|
| 14 SEER | ~13.4 SEER2 |
| 16 SEER | ~15.2 SEER2 |
| 18 SEER | ~17.1 SEER2 |
| 20 SEER | ~19.0 SEER2 |
New Minimum Standards by Region (2023+)
- North (Minnesota, Wisconsin, Michigan, etc.): 13.4 SEER2 minimum
- South (Florida, Texas, Georgia, etc.): 14.3 SEER2 minimum
What SEER2 Rating Should You Buy?
Minnesota homeowners: The minimum 13.4 SEER2 is adequate, but 14–16 SEER2 is worth the modest premium for a system running 4–5 months/year. The payback period on stepping up to 16 SEER2 is typically 5–8 years in Minnesota.
Florida homeowners: Minimum 14.3 SEER2 is now required. For Southwest Florida where AC runs 9–10 months/year, stepping up to 16–18 SEER2 has a realistic 4–6 year payback and is worth considering, especially for owners who plan to stay in the home long-term.
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