The river rises slowly here. That is exactly why it ruins air conditioners.
The St. Johns does not flash flood. It climbs for days after the storm has passed and then sits there. For equipment at grade along its banks, that is the worst kind of water.
A river that floods in slow motion
The St. Johns drains north, and the rain that falls on the upper basin during a storm takes days to arrive at Putnam County. That is why the two floods everyone here remembers happened after the weather had cleared. In September 2017 Irma pushed most of the river’s gauges into major flood stage, some to records, with the crest arriving days after the wind. In late September 2022 Ian passed well to the south, and the river still came up into Welaka’s streets and over the East Palatka boat ramp, staying high for seven to ten days while county officials warned residents the worst was yet to come.
For an air conditioner, a flash flood that comes and goes in an afternoon is bad. A river that sits in the cabinet for a week is worse. Corrosion needs time, and this river gives it plenty.
Tallying what one flood costs
Add it up for a typical riverfront block house with a split heat pump at grade and the air handler in a utility room on the slab.
The outdoor unit. Silt in the fan motor, corrosion on the contactor, capacitor terminals and compressor connections. Best case, a teardown, cleaning and electrical parts: a mid-range repair. Worst case, the compressor’s terminals corrode through and the unit is replaced.
The air handler. Water in the blower motor and control board, insulation soaked and growing mold within days. Usually a replacement of the air handler, because wet cabinet insulation cannot be made clean again.
The ductwork. In a crawlspace, flex duct that took water is finished; the insulation holds moisture and the inner liner grows mold. Replaced, not cleaned.
The thermostat and low-voltage wiring. Minor, but add it.
The time. A week or more without cooling in late September, in a house that is itself drying out.
Put in words: one flood on a grade-level system costs roughly what a new system costs, spread between repairs, partial replacements and the eventual failure of the parts that were cleaned rather than replaced.
What a stand costs
A galvanized or composite stand that puts the outdoor unit two to three feet off the ground, with the electrical disconnect relocated above it and the line set extended, is a fraction of the flood bill above: in the same range as a mid-level repair, done once. Raising the air handler onto a platform or into the attic adds to that, and it depends on the house. Replacing crawlspace duct with insulated duct hung high or run through the attic adds more. Even the full package is less than one flood, and it is done on your schedule rather than the river’s.
How high is high enough
We measure from the marks the river left. Stain lines on skirting, fence posts and block walls from 2017 and 2022 are visible on most riverfront lots in Welaka, Georgetown, Satsuma and East Palatka, and we build above the higher of them with margin. Where no marks remain, the county’s flood maps and the elevation certificate for the property give the base elevation, and we go above that. A stand that is six inches too short is a stand that did nothing.
The week before the crest
Because the river rises slowly, there is time to act. The checklist, from the day the storm passes:
- Watch the gauge forecast. The river’s rise is predictable days out.
- Switch the air conditioner breaker off before water reaches the pad. A unit that is de-energized when it floods is far more likely to be salvageable than one that was running.
- Switch off the air handler at its own breaker if the utility room or crawlspace is in the path.
- Photograph everything with a date stamp: the units, the water line as it rises, the panel. Adjusters want it.
- Do not restart when the water drops. Call for an inspection first.
The week after
A post-flood visit opens both cabinets, removes silt, dries and tests every electrical component, checks motor bearings, inspects the duct and the insulation, and gives you a written condition report for the insurer. Then it gives you the honest verdict: clean and run, repair, or replace, and if replace, at what height.
Where this applies
Everywhere the river and its tributaries reach: Welaka and Georgetown on the west bank toward Lake George, Satsuma along Dunns Creek, San Mateo and East Palatka on the east bank, and the riverfront blocks of Palatka itself around Riverfront Park. If your property carries a stain line from either year, your equipment needs a plan before the next one.
River flooding questions from both banks
The water never reached the top of the unit. Why would it be damaged?
Because the vulnerable parts are at the bottom. The compressor terminals, contactor, capacitor and control wiring sit in the lower part of the cabinet, and the fan motor’s bearings are not far above. Six inches of river water in the base is enough to start corrosion that fails months later.
Should the air handler inside be raised too?
If it is on a slab or in a crawlspace that took water, yes. An air handler’s blower motor, control board and electrical connections sit low in the cabinet and the insulation holds water for weeks. Moving it to a platform, a closet shelf or the attic is part of a serious flood plan.
Will raising the unit lower my flood insurance premium?
That is a question for your insurer, not for us. What we can say is that an elevation certificate and photos of mechanical equipment above the base flood elevation are documents adjusters ask for, and we provide the equipment photos and measurements.
How long after the water drops before the system can be turned back on?
Not until a technician has opened it, cleaned the cabinet, dried and tested the electrical components and checked the motors. Powering a wet unit is how a repairable system becomes a replacement.
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