The 2026 South Florida AC buying guide

1. Size it with a Manual J, not a rule of thumb

"One ton per 500 square feet" is how South Florida ended up with so many oversized systems. An oversized AC cools quickly and shuts off before it removes humidity, leaving the house cold and clammy, and the constant short cycles wear it out early. Ask every contractor for a Manual J load calculation (insulation, windows and orientation, ceiling height, shade, air leakage, occupants) and ask to see it. Two houses on the same street can need different sizes.

2. Know the efficiency rules (SEER2)

Since 2023, efficiency is rated in SEER2. In the Southeast, new split-system central ACs must be at least 14.3 SEER2 (13.8 SEER2 at 45,000 BTU and above) and heat pumps at least 14.3 SEER2 (DOE efficiency standards). For most homes here, something around 15–17 SEER2 with a two-stage or variable-speed compressor is the value sweet spot: variable-speed equipment runs longer at low speed, which is exactly what removes humidity. The top-tier efficiency ratings pay back more slowly.

3. Understand the refrigerant change

New residential equipment now uses R-454B or R-32 instead of R-410A. They're A2L (mildly flammable) refrigerants, so the systems have leak detection and installers follow updated rules. Older R-410A equipment built before 2025 can still legally be installed (the EPA removed its installation deadline in 2026), and existing R-410A systems can be serviced. What you can't do is mix them: a new outdoor unit needs its matched indoor coil. Ask for the AHRI certificate for the exact indoor and outdoor pair you're buying.

4. Heat pump or straight AC

In South Florida a heat pump costs little more than a straight AC and heats efficiently on the few cold nights, so it's usually the better choice. Our heat pump vs. central AC comparison goes deeper.

5. The install matters more than the brand

A well-installed mid-range system will outlast a badly installed premium one. What matters: correct sizing, a matched coil, a clean and flushed (or new) line set, refrigerant charge set by measurement, proper drainage with a float switch, and hurricane tie-downs. Choose a brand with good local parts supply, then choose the installer carefully.

6. What every quote should include

• Exact model numbers and the AHRI certificate
• The Manual J result
• Permit, inspection and (in Miami-Dade and Broward) product-approved equipment and anchoring
• Pad, tie-downs, float switch, drain work and disposal of the old unit
• Who registers the manufacturer warranty, and the labor terms in writing
• The contractor's CAC license number
• One out-the-door price

7. Incentives in 2026

• Federal tax credit: the 25C credit for heat pumps and central AC ended for equipment installed after December 31, 2025.
• FPL: an instant rebate on qualifying high-efficiency systems, paid through FPL's participating contractors (FPL A/C rebate). Check eligibility with your installer.
• Manufacturer promotions: seasonal; ask what's running when you get quotes.
• Financing: see financing.

8. Red flags

• "This price is only good today."
• No load calculation, or "same size as the old one."
• No permit, or "you don't need one for a swap." In Florida you do.
• A new outdoor unit on an old indoor coil with no explanation.
• A vague answer to "what's your license number?"