What actually goes wrong in a closed-up Florida condo

When people imagine something going wrong in an empty condo, they picture a break-in or a hurricane.

Working this coast, that’s almost never what it is. Storms are loud and everyone sees them coming. Burglary is rare in a secured tower. What actually ruins a closed unit is quiet, cheap, and starts on an ordinary Tuesday in July when nobody is there to hear it.

Here is what actually goes wrong, in the order it actually happens.

1. The air conditioner’s drain line clogs

This is the single most common claim in Florida condos, and it’s a part most owners have never thought about.

Your air handler pulls moisture out of the air. That water has to go somewhere — it runs into a pan and out through a condensate drain line. That line is narrow, it’s dark, it’s wet, and over a season it grows a biological sludge that eventually plugs it.

When it plugs, the water backs up. It fills the pan, then it goes over the side. If you’re lucky it trips a float switch and shuts the system off. If you’re not, it goes through your floor and into the ceiling of the unit below yours.

That’s the part people miss. It stops being your problem and becomes two owners’ problem — and the one downstairs didn’t choose to be away.

The whole failure costs a few dollars of sludge and about ninety seconds to check.

2. The humidity number — and the one everyone gets wrong

If the AC quits in July, the unit doesn’t just get hot. It gets wet. A closed condo with no dehumidification in a Florida summer is a terrarium.

You’ll see it repeated everywhere online that “60% humidity is where mold starts.” That isn’t right, and it’s worth knowing why.

EPA lists 60% relative humidity among common moisture problems — alongside things like a leaking roof. It’s a control ceiling, not a growth threshold. Actual mold growth is driven by moisture at the surface, not the number floating in the middle of the room. Mold can start below 60% on a cool exterior wall, and start nothing at all at 60% on a warm one.

So the honest version isn’t “60% means mold.” It’s:

Target 30–50%. If it’s over 60%, something is already wrong — and you’ve just found it.

That’s a more useful sentence, because it sends you looking for the cause instead of arguing about a number.

Why this one matters more than any other check: Florida policies typically sublimit mold at around $10,000 — some as low as $1,000–5,000 — while real remediation in a condo runs $20,000 to $50,000. Water damage you can usually insure. Mold is the loss you largely cannot insure your way out of. Which is exactly why the thermostat reading is worth more than it looks.

Related, and quieter: a tripped AC breaker is a clock that started days ago. Nothing looks wrong. The unit is just slowly getting wetter.

3. The slow leak — where the date matters more than the damage

Supply lines fail. Not dramatically — they weep. Under a sink, behind a toilet, at the icemaker.

A wax ring under a toilet can fail without ever looking wet from standing height; you have to put a hand on the floor behind the base to know. In an occupied home someone notices in a day. In a closed unit it runs for a month.

And here’s the part that should get your attention, because it’s not about the water.

Florida property policies commonly exclude loss caused by “constant or repeated seepage or leakage of water… over a period of 14 or more days.” That clause is real and it’s widespread.

In Hicks v. American Integrity Insurance Co. of Florida (5th DCA, 2018 — that’s this district), a homeowner was out of town when his refrigerator supply line started leaking. By the time he came back five weeks later it was running roughly a thousand gallons a day. The insurer’s own expert dated the leak at five weeks and change, and the carrier denied the claim under that clause. He had to litigate it to an appellate court and settled for partial coverage.

Read that again, because the lesson isn’t “water isn’t covered.”

The fight is never whether water damage is covered. The fight is when it started — and if nobody has been inside your unit, you have no answer. The only timeline in the room belongs to the insurer’s expert.

That’s the actual argument for someone walking the unit on a schedule. It isn’t that a visit stops a line from failing — nothing does. It’s that seven days of water is a plumber. Thirty days of water is a lawsuit you’re fighting without a witness.

Two honest limits on that, because I’d rather you hear them from me:

• Policy language varies, and carriers have been actively rewriting this wording since 2018 to close the gap Hicks exposed. Your 2026 policy may read differently. So don’t take “you’re covered for 13 days” from me or anyone else — pull your own policy, find the seepage clause, and ask your agent about Hicks by name.
• I’m not your lawyer or your insurance agent. I’m a licensed agent on this coast pointing at a published case from your own appellate district. Take it to the people who are those things.

4. The coastal ones nobody expects

These don’t happen in Ohio. They happen here.

• Wind-driven rain through the slider tracks. The tracks have small drainage holes. They pack with sand and salt. When a squall drives rain sideways at the glass, the water has nowhere to go but in — across your floor, from a door that is closed and locked and looks perfect.
• Salt eats hardware. Locks, hinges, railing anchors, AC coils. It’s slow and it never stops.
• Dry traps. Nobody runs the taps for six months, the P-traps evaporate, and sewer gas comes up through the drains. Owners smell it on arrival and think they have a mold problem. They have a thirty-second problem.
• Nobody looks up. Ceiling stains are the earliest visible sign of most of what’s above — and they’re the one thing a person doing a quick walk-through never checks, because it isn’t at eye level.

What it adds up to

None of this is dramatic. That’s the whole point — dramatic problems announce themselves. These don’t. Every one of them is cheap to catch on a Tuesday and expensive to discover in November.

And the math is uncomfortably simple: the damage is a function of how long it ran. Not how bad the failure was — how long nobody knew. A supply line that lets go the week after someone walked the unit is a repair. The same line, the same failure, discovered five weeks later, is Hicks.

So whether you hire someone, lean on a neighbor, or fly down yourself — the question that actually matters isn’t “is anyone checking on my place?”

It’s “how many days could something run before anyone would know?”

Whatever number you come up with, that’s your real exposure. Everything else is detail.

Robert Kirkland is an active Florida real estate agent on the east-central coast and runs Anchor & Key, a home and boat watch service for owners who aren’t here year-round. If you want someone to walk your place and show you what a real visit report looks like — no cost, no obligation — get in touch.