ServiCoverSEER vs. SEER2
SEER2 measures cooling efficiency under test conditions that better reflect real ductwork. The numbers look lower than old SEER ratings for the same equipment — a 14.3 SEER2 unit is roughly comparable to an older 15 SEER unit — so compare SEER2 to SEER2.
Current Minimums by Region (Split-System Central AC under 45,000 BTU/h)
| Region | Minimum SEER2 |
|---|---|
| North | 13.4 |
| Southeast | 14.3 |
| Southwest | 14.3 (plus EER2 requirements) |
Heat pumps carry a national minimum of 14.3 SEER2 along with a heating-efficiency (HSPF2) minimum. Higher ratings cost more up front but lower operating costs, especially in hot climates with long cooling seasons.
The Refrigerant Transition
Under the federal AIM Act, the HVAC industry is phasing down high-global-warming-potential refrigerants. R-410A — standard for years — is being replaced in new residential equipment by R-454B (used by brands like Carrier, Trane and Lennox) and R-32 (used by brands like Daikin and Goodman).
| Refrigerant | Status | What It Means for You |
|---|---|---|
| R-22 | No longer produced in the US | Repairs rely on reclaimed supply; costly |
| R-410A | Being phased down for new equipment | Existing systems can still be serviced |
| R-454B / R-32 | Standard in new systems | Mildly flammable (A2L), handled under updated codes |
What This Means for Buyers
- New systems cost somewhat more — manufacturers redesigned equipment for the new refrigerants.
- Mixing isn't possible — you can't pair a new R-454B outdoor unit with an old R-410A indoor coil; both typically need replacing.
- Your current system is fine — no rule forces you to replace a working R-410A system.
- Hire trained installers — A2L refrigerants require updated handling procedures and code compliance.
Frequently Asked Questions
R-454B is classified as mildly flammable (A2L), and equipment using it is designed with leak-detection and safety features under updated building codes. Proper installation by trained technicians is key.
In hot climates, higher ratings pay back faster through lower electric bills. In cooler climates with short summers, a unit near the minimum is often the more economical choice.