SEER2 minimums for AC replacement in Lake Mary, Florida
Florida is in the DOE Southeast region. A split-system central air conditioner must meet 14.3 SEER2 below 45,000 Btu/h and 13.8 SEER2 at or above it; split heat pumps follow the national 14.3 SEER2 and 7.5 HSPF2. In the Southeast the standard is enforced at the date of installation, not manufacture.
The minimums that apply to a Lake Mary changeout
| Equipment | Minimum | What it means here |
|---|---|---|
| Split-system AC below 45,000 Btu/h (under ~4.5 tons) | 14.3 SEER2 | The tier that covers essentially all Lake Mary residential work. Roughly equivalent to the old 15 SEER. |
| Split-system AC at 45,000 Btu/h and above | 13.8 SEER2 | Roughly equivalent to the old 14.5 SEER. Relevant on the larger Heathrow Woods systems. |
| Split-system heat pump | 14.3 SEER2 / 7.5 HSPF2 | Heat pumps follow the national standard rather than a regional one, so the same number applies in every state. |
The wrinkle that catches Florida buyers: installation date
In the Southeast and Southwest regions the split-system air conditioner standard is enforced by date of installation, not date of manufacture. A pre-2023 unit that does not meet 14.3 SEER2 cannot legally be installed in Florida even if it was built before the standard took effect and is still sitting, boxed, in a warehouse.
This matters because clearance stock is exactly what gets offered to a homeowner in a hurry in July. If a quote is unusually cheap and the model number is old, look up the rating rather than taking the salesperson at their word. The AHRI reference number for the matched combination is the thing to ask for — a rating holds only for the combination it was certified as, so a new condenser on an old indoor coil does not carry the number on the brochure.
Does a higher SEER2 pay for itself in this climate?
Better here than in most places, and for a specific reason: Orlando records roughly 3,452 cooling degree days a year on NOAA’s 1991–2020 normals. Efficiency pays back in proportion to runtime, and this market has a great deal of it.
Two caveats that matter more than the rating itself. First, ductwork: a leaking 1988 attic duct system will defeat any SEER2 number you pay for, and 26.9% of City of Lake Mary parcels date from 1970–1989. What duct replacement costs ›
Second, sizing. An oversized high-SEER2 system short-cycles, never runs long enough to dehumidify, and produces the cold, clammy house that is Central Florida’s real comfort complaint. Rated efficiency is measured under steady-state conditions the oversized system never reaches. Sizing, properly ›
Where the rating does directly pay you back is the rebate ladder: Duke’s tiers turn on SEER2 and HSPF2 thresholds, so the efficiency decision and the rebate decision are the same decision. The tiers ›
Sources for this page
- AHRI — residential central air conditioners
- NOAA — US climate normals
- Seminole County Property Appraiser
Researched 6 September 2026. Fees, rebate amounts and code minimums change — check the issuing authority before you rely on a figure.