If you've shopped for a new air conditioner lately, you've seen SEER2 numbers on every quote and spec sheet. In Central Florida, where the AC runs for much of the year, efficiency matters more than it does in most of the country. Here's what the rating means, what the minimums are here, and how to use it when you compare systems.
What SEER2 stands for
SEER2 is the Seasonal Energy Efficiency Ratio 2. It compares the total cooling a system delivers over a typical cooling season with the electricity it uses to do it. The higher the number, the less electricity it takes to provide the same amount of cooling.
The "2" refers to the updated federal test procedure that took effect on January 1, 2023. The new test assumes more resistance from ductwork, called external static pressure, which is closer to what systems face in real homes. Because the test is tougher, a system's SEER2 number is a bit lower than its old SEER number. That's why you can't compare a SEER2 rating directly to an old SEER rating.
The minimum SEER2 in Florida
The U.S. Department of Energy sets regional minimums for central air conditioners, and Florida is in the Southeast region. For new split-system central air conditioners installed here:
- Under 45,000 BTU/h (smaller than about 3.75 tons): at least 14.3 SEER2
- 45,000 BTU/h and up: at least 13.8 SEER2
Those match the old Southeast minimums of 15 SEER and 14.5 SEER, just measured with the new test. Split-system heat pumps must meet 14.3 SEER2 for cooling and 7.5 HSPF2 for heating.
SEER2, EER2 and HSPF2: what each one tells you
- SEER2 describes cooling efficiency across a range of conditions over a whole season.
- EER2 measures cooling efficiency at a single hot test condition, 95°F outdoors. It's a useful clue for how a system handles our hottest afternoons.
- HSPF2 is the heating efficiency rating for heat pumps. Cooling dominates in Central Florida, but many homes here heat with a heat pump on cool nights.
How SEER2 affects your power bill
For the cooling part of your bill, electricity use goes down as SEER2 goes up, assuming the same home, the same weather and the same thermostat settings. You can estimate the difference between two ratings with simple math:
Estimated cooling energy savings = 1 − (lower SEER2 ÷ higher SEER2)
For example, comparing a 14.3 SEER2 system with a 17 SEER2 system: 1 − (14.3 ÷ 17) ≈ 0.16, or roughly 16% less electricity for cooling. That's a comparison of ratings, not a guarantee. Real-world results depend on how much your system runs, your electric rate, your home's insulation, windows and ductwork, and how well the system is installed and maintained.
Because air conditioners here run most of the year, efficiency differences show up on more of your bills than they would in a cooler climate. That's one reason higher-efficiency systems are often worth a closer look in Florida. They also usually cost more up front, so whether a step up pays off depends on your home, how you use your AC and how long you plan to stay.
Things that matter as much as the rating
- Right sizing. An oversized system short-cycles, which wastes energy and leaves humidity behind. An undersized one runs nonstop on summer afternoons. A proper load calculation matters more than chasing the biggest number. See what size AC you need.
- Ductwork. Leaky or undersized ducts in a hot Florida attic can waste cooling you've paid for, no matter what the equipment is rated.
- A matched system, installed correctly. A system only reaches its rated efficiency when the indoor and outdoor units are a certified matched combination and the refrigerant charge and airflow are set correctly.
- Maintenance. Dirty filters, dirty coils and clogged drains drag efficiency down over time.
- Humidity control. Two-stage and variable-speed systems, which often carry higher SEER2 ratings, can run longer at low speed and remove more moisture. A drier house often feels comfortable at a slightly higher thermostat setting.
How to choose the right SEER2 for your home
Start with the minimum required for your system's size, then ask how a step up would change comfort and operating cost in your home. Ask your contractor for the AHRI-certified rating of the exact indoor and outdoor combination being quoted, not just the outdoor unit's best-case number. And if you're still deciding whether to replace at all, read our guide to repairing or replacing an AC in Central Florida.
We'll walk you through the options, recommend a system sized for your home and give you a clear price with no pressure. Learn more about AC installation and replacement or read the SEER2 answer in our FAQ. Once your system is in, a Comfort Club plan or a regular AC tune-up helps keep it running close to its rated efficiency.
