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SEER2 explained for Casselberry, Florida homeowners
SEER2 is the efficiency test in force since 1 January 2023, run at a higher static pressure than old SEER. Split-system air conditioners installed in Florida must meet 14.3 SEER2 under 45,000 Btu/hr. In the Southeast the standard is enforced at installation, not at manufacture.
Minimum SEER2 for a Casselberry installation
| Equipment | Minimum | Where it applies |
|---|---|---|
| Split-system AC, under 45,000 Btu/hr | 14.3 SEER2 | Southeast region — Florida. The North floor is 13.4. |
| Split-system AC, 45,000 Btu/hr and over | 13.8 SEER2 | Southeast region |
| Split-system heat pump | 14.3 SEER2 / 7.5 HSPF2 | National |
| Single-package air conditioner | 13.4 SEER2 | National |
| Single-package heat pump | 13.4 SEER2 / 6.7 HSPF2 | National |
| Space-constrained AC | 11.7 SEER2 | National |
| Small-duct high-velocity | 12 SEER2 / 6.1 HSPF2 | National |
No regional EER2 minimum applies in the Southeast — the EER2 add-ons are a Southwest rule. Anyone quoting you an EER2 floor for Florida has borrowed Arizona copy.
Why a bargain unit may not be legal to fit here
In Florida the standard is enforced at installation, not at manufacture.
The Department of Energy is explicit: for split systems in the southern region the amended standards are based on the date of installation, so units installed on or after 1 January 2023 must meet the new standards, and a contractor should not install non-compliant equipment in the Southeast. Under 10 CFR 430.2, “installation of a central air conditioner” means connecting the refrigerant lines and/or electrical systems to make it operational.
The consequence: old pre-2023 stock sitting in a warehouse can legally be installed in Ohio and cannot legally be installed in Casselberry. If a quote is notably cheap and the model number is old, that is the question to ask. DOE takes reports at EnergyEfficiencyEnforcement@doe.gov.
SEER2 rates the box, not your house
SEER2 is a rating of the box. It is not a rating of your house. The test is run at a defined external static pressure; your 1977 Casselberry attic duct system may be running well above it, in which case the equipment cannot move its rated airflow and will not deliver its rated capacity or its rated efficiency. This is the single most common reason a homeowner spends extra on a high-SEER2 system and does not see the bill move.
Casselberry’s median improved residential parcel was built in 1977, and 57.1% of the city was built between 1970 and 1989. In that stock the duct system is usually older than the equipment by two or three generations. Test the ducts before you buy efficiency: what duct work costs here.
The efficiency tier does have one direct financial consequence that is worth money: Duke Energy’s largest rebate tiers are gated on efficiency. The $1,000 strip-heat-to-heat-pump tier as published requires 16.8 SEER / 9.0 HSPF, or 16 SEER2 / 7.5 HSPF2. The rebate tiers, with their caveats.
Comparing two quotes with different SEER2 numbers?
Ask for the AHRI matched-system rating, not the condenser's number on its own. A mismatched coil changes the answer.
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The question this page answers
What does a SEER rating mean for an air conditioner?
SEER is a seasonal energy efficiency ratio: the cooling a system delivers over a season divided by the electricity it consumes, in watt-hours. Higher is better. SEER2 is the current version of the test, in force since 1 January 2023, and it is run against a higher external static pressure that is closer to a real duct system than the old test was. That is why a SEER2 number is lower than the SEER number for the same equipment — the equipment did not get worse, the test got more honest.
The practical number for Florida: split-system central air conditioners installed in the Southeast region must meet 14.3 SEER2 under 45,000 Btu/hr, and 13.8 SEER2 at or above it. Split-system heat pumps must meet 14.3 SEER2 and 7.5 HSPF2 nationally.
These fourteen questions are recorded verbatim in this site’s research file. They were taken from the published FAQ pages of Central Florida HVAC contractors and from indexed article titles — they are competitor-FAQ proxies and real searcher phrasings, not a captured Google People Also Ask box. Each is answered once, on one page, in the wording it was found in.
Where the facts on this page come from
Every figure above is either a primary-source document or a named third-party cost guide. All of it was checked in September 2026. Fee schedules, rebate amounts and market prices change without notice — if you are about to spend money on one of these numbers, open the source and check it.