AC replacement and installation in Miami-Dade

Replacing a system in Miami-Dade in 2026 means three things happened at once: the refrigerant changed, the efficiency floor rose, and the county's permit and hurricane rules apply to every change-out. A good quote accounts for all three and says so in writing.

Call dispatch or send the form; an independent local AC contractor visits, measures, and quotes. They pull the permit and do the work; you deal with them directly.

What a Miami-Dade change-out involves

• A load calculation (Manual J) or at least a real look at the house, so the new system is sized for it rather than copied from the old data plate. Oversized systems short-cycle and leave the house humid.
• A mechanical permit from the county or your city, pulled by the licensed contractor. Homeowners cannot self-permit AC work in Miami-Dade.
• Equipment that carries a Miami-Dade Notice of Acceptance, verified by the permit office against the model number.
• The condenser set on a proper pad or stand and tied down with brackets rated for High Velocity Hurricane Zone winds.
• New line set or a flushed and pressure-tested existing one, a new drain with a trap and float switch, an electrical disconnect and breaker sized to the unit.
• Inspection by the building department before the permit closes. Keep the closed permit; buyers and insurers ask for it.

Choosing the system

Every new system now uses R-454B. Minimum efficiency for a split system in the Southeast is SEER2 14.3; higher-SEER2 units cost more up front and less every month, and FPL offers an instant rebate on qualifying systems installed by an FPL-approved contractor. A heat pump costs little extra here and covers the few cold nights without electric strip heat. Variable-speed systems handle Miami humidity noticeably better than single-stage ones.

For homes without ducts, or with ducts too far gone to reuse, a multi-zone mini-split is often the better answer than forcing a central system in. The contractor should raise it if it applies.

What drives the price

We do not quote. The contractor's written quote reflects tonnage, SEER2 rating, single-stage versus variable-speed, air handler location and access, whether ductwork needs repair or replacement, electrical work, the tie-downs and pad, and the permit. Get the model numbers, the NOA numbers, the warranty terms, and the permit on the quote, and confirm the CAC or CMC license before signing.

Registering the warranty

Manufacturer parts warranties are often ten years only if the system is registered within a set window after installation, and much shorter if not. Ask the contractor who registers it and get the confirmation.