On September 26, 2024, Helene pushed the Gulf and the bay into Pinellas from both sides. The National Weather Service measured peak water 6.67 feet above the normal high tide at Clearwater Beach and 6.31 feet at St. Petersburg, both records for those sites; East Bay in Hillsborough reached 7.2 feet. Streets and ground floors flooded in Shore Acres, on the beaches, in Gulfport and along the bay side, in houses that had never taken water. Most of those houses have an air-conditioning condenser sitting on a pad a few inches off the ground, and by the next morning a great many of them had been under salt water.

Two years on, the question still comes up on AC calls from the flood zones, and it is worth answering properly: what happens to a system that flooded, what the code says about putting the new one back, and what the paperwork should look like.

Flooded equipment is replaced, not repaired

The industry’s own guidance is blunt. AHRI, the trade association that certifies the equipment ratings on every AHRI certificate your contractor files with a rebate, says that “flood-damaged heating and cooling equipment and systems should be replaced and not repaired,” and that “all inspection and replacement work on flooded equipment should be performed by qualified heating and cooling contractors, not by homeowners.”

The reasons are mechanical, not commercial. Salt water gets into the compressor terminals, the contactor, the capacitor, the fan motor, and the control board; corrosion can start inside components where nobody can see it and cause failures later. Refrigerant lines and the coil can shift when water moves a unit even an inch, which means a leak. On a system with a gas furnace, the gas valve and controls are the part AHRI worries about most, because water damage there is a safety problem as well as a repair.

An air handler that took a few inches of fresh rainwater in a garage is a judgment call the contractor can make on the spot. A condenser that sat in surge should be treated as a replacement unless the contractor can show otherwise, and they should say so rather than sell a capacitor now and a compressor in March.

The code: the replacement goes at or above the flood elevation

This is the part most homeowners met for the first time in October 2024. The Florida Building Code, Residential (8th edition, 2023), section R322.1.6, covers “protection of mechanical, plumbing and electrical systems” in flood hazard areas. Heating, ventilating, and air-conditioning equipment “shall be located at or above the elevation required in Section R322.2 or R322.3.” And then the sentence that matters after a storm: “Replacement of exterior equipment and exterior appliances damaged by flood shall meet the requirements of this section.”

So a flood-damaged condenser in a mapped flood zone does not go back on the same pad. It comes back on a platform or a stand at or above the required flood elevation. That is a rule about the replacement itself, regardless of whether the house crosses the 50 % substantial-damage line; substantial damage triggers a much bigger conversation about elevating the house, but the equipment rule applies on its own.

There is an exception in the code for equipment “designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads” per ASCE 24, but a residential condenser is not that.

How high: Pinellas and the base flood elevation

The required elevation is set by the FEMA flood map for the address (the base flood elevation, or BFE) plus a local freeboard. Pinellas County’s floodplain page says it plainly: “Pinellas County requires that new or substantially-improved buildings be built at least one foot above the base flood elevation.” The cities (St. Petersburg, Clearwater, Largo, Gulfport, the beach towns) run their own building departments and floodplain ordinances, and some set the design flood elevation higher; the county’s Flood Information Services, (727) 464-7700, will tell you the BFE and the design flood elevation for a specific address before anyone builds a platform.

In practice, on a Shore Acres or Clearwater Beach house in an AE zone, the new condenser ends up on a stand at the elevation the county or city sets for that address, anchored to the site’s design wind speed (145 mph everywhere in Pinellas under the county’s local amendment to the code), with the line set, the disconnect, and the drain extended to match. A condenser that already sits on a platform at or above that elevation does not have to move. The air handler, if it is on the ground floor, is the harder conversation: the same section of the code applies to it, which is why so many post-Helene replacements moved air handlers into the attic or up onto a platform in the garage.

What the permit and the quote should show

Every change-out in Pinellas needs a mechanical permit, pulled by the contractor through the city (St. Petersburg, Clearwater, Largo, Pinellas Park) or the county for unincorporated areas. After a flood the permit is also how the elevation gets checked: the inspector looks at the platform height against the flood elevation on file. A contractor who offers to “just swap it, no permit” after a flood is offering to leave you with equipment that fails the next inspection, the next insurance survey, and the next buyer’s four-point.

The quote should show:

The equipment: the outdoor unit and, if it flooded, the air handler, with the SEER2 rating and the refrigerant (R-454B or R-32 for new systems; an EPA rule effective July 27, 2026 lets R-410A units made in or imported into the US before 2025 be installed while stock lasts, so either is legal and the quote should say which).
The platform or stand and its height, and the words “flood elevation” or “BFE” somewhere near it.
The anchoring, the extended line set and electrical, the disconnect, and the condensate drain.
The permit, as a line item or included.
The load calculation (Manual J) if the air handler is being replaced; the energy code sizes equipment by it.

Duke’s rebate window for an emergency replacement

Pinellas is Duke Energy Florida territory, and Duke’s HVAC rebates normally require a Duke Home Energy Check (Duke does not charge for it) within the previous 24 months before the install. After a flood nobody waits for an audit, so Duke’s program has a rule for exactly this: “in the case of an emergency replacement, customers must complete the Home Energy Check within 12 months following the installation of the system to qualify for the incentive.” Replacing an existing AC or heat pump needs SEER2 15.2 (heat pumps also HSPF2 7.5), the work must be done by a licensed, insured AC contractor, and the claim goes through Duke’s rebate portal. The amounts are on Duke’s page; ask the contractor to file it and to confirm the model qualifies.

The federal Section 25C credit is unavailable for equipment placed in service after December 31, 2025, so it does not apply to a replacement this year.

The licensing question, once

Air conditioning is a state-licensed trade in Florida. A certified contractor’s license number begins with CAC (Class A or B, statewide); a registered one with RA, valid only in its local jurisdiction; mechanical contractors are CMC or RM. Pinellas also licenses AC contractors at the county level through the PCCLB, and state-certified contractors are exempt from that registration. Refrigerant is handled only by an EPA Section 608-certified technician.

Sources checked and text reviewed September 18, 2026. Diagnostic and safety statements are general; your contractor’s assessment of your equipment governs.

Your AC after a flood in Pinellas: replace, and the elevation rule