Finding water pooling around your indoor air handler, dripping from a ceiling vent, or staining the drywall near your AC closet is alarming — and in a Tampa Bay summer it’s a problem you can’t ignore for long. Your air conditioner pulls an astonishing amount of moisture out of our humid Gulf air, sometimes 10 to 20 gallons a day, and all of that water is supposed to drain away quietly. When it shows up on your floor instead, something in that drainage path has gone wrong. The good news is that the most common cause is also the easiest to fix, and a few quick checks can tell you whether you’re looking at a simple clog or a service call. Here’s what we tell our Seminole and Pinellas County customers when their AC starts leaking.
If you work through the checks below and water keeps coming, don’t let it sit — standing water around an air handler leads to mold and can damage the system itself, so it’s time for AC repair.
First, what’s actually happening inside your AC
A little background makes every cause below make sense. As warm, humid air passes over the cold evaporator coil inside your air handler, moisture condenses out of it — exactly like droplets forming on a cold glass of iced tea. That condensation drips into a drain pan beneath the coil and flows out of your home through a condensate drain line, usually a white PVC pipe that empties outside or into a household drain. When water ends up on your floor instead, it almost always means that drainage path is blocked, broken, or overwhelmed.
Start with the things you can check yourself
Before you assume the worst, rule out the simple stuff. These checks solve a large share of “AC leaking water” calls:
- Check (or change) the air filter. A clogged filter is the surprise culprit behind a lot of leaks. When airflow chokes down, the coil gets too cold and freezes over; when that ice later melts, it overwhelms the drain pan and spills. If your filter is dirty, replace it — and in a Florida summer, check it monthly.
- Look for a clogged condensate drain line. This is the number-one cause we find. Over time, algae and slime build up inside that white PVC line and plug it, so the water backs up and overflows the pan. Many systems have a small safety float switch that shuts the AC off when this happens — so a leak that comes with the system not running is a strong clue the line is clogged. You can try gently clearing the outdoor end of the line with a wet/dry vacuum, but a fully blocked line usually needs a tech to flush it properly.
- Check for ice on the unit. If you see frost or ice on the copper lines or the indoor coil, turn the system off and let it thaw. A freeze-up almost always traces back to a dirty filter or low refrigerant, and the puddle you’re seeing may simply be the melt. Once it thaws, replace the filter and watch closely — if it ices up again, that’s a service call.
- Make sure the unit is level and the pan isn’t rusted. An air handler that has shifted out of level can let water miss the drain, and on older systems the metal drain pan itself can rust through and leak. These are easy for a tech to confirm.
When it’s time to call a technician
If the easy checks don’t stop the water, the cause is usually one of these — and they need a trained tech to put right:
- A stubbornly clogged or broken drain line. When a wet/dry vacuum won’t clear it, the line needs to be properly flushed and treated, and sometimes a cracked or disconnected section has to be repaired. We also add an algae tablet or treatment so it doesn’t clog again next month.
- Low refrigerant from a leak. Low refrigerant drops the coil below freezing, it ices up, and the melt overflows the pan. Refrigerant doesn’t get “used up,” so if you’re low, you have a leak that a tech needs to find, repair, and recharge to spec — running a refrigerant-starved system also slowly destroys the compressor.
- A failed condensate pump. If your air handler is in a closet, attic, or anywhere it can’t drain by gravity, a small pump moves the water out. When that pump fails, the pan fills and overflows. Replacing it is a quick, inexpensive repair.
- A rusted-through drain pan. On older systems, the pan that catches the condensation can corrode and leak from the bottom. That’s a part replacement, and it’s often a sign the rest of the system is aging too.
Why Florida systems leak more
Our air conditioners live a harder life than almost anywhere else in the country. The cooling season runs from spring well into fall, and our humidity means your AC isn’t just cooling the air — it’s wringing gallons of water out of it every single day. That constant flow of condensate is exactly why algae thrives in the drain lines and why a clog that might take a year to form up north can plug a Florida line in a single season. Staying on top of maintenance — which includes clearing and treating that drain line — is the single best way to keep a small leak from becoming water damage on your ceiling.
Frequently asked questions
Why is water leaking from my air conditioner?
In Florida the most common cause by far is a clogged condensate drain line. As your AC pulls moisture out of humid air, that water drains through a white PVC line that slowly clogs with algae and slime until it backs up and overflows the pan. Other causes include a dirty air filter that freezes and then melts the coil, low refrigerant, a failed condensate pump, or a rusted drain pan. Start by checking the filter and the drain line.
Is it safe to run my AC if it’s leaking water?
It’s best not to. A little condensation is normal, but active dripping or pooling means water is going somewhere it shouldn’t — onto drywall, into the air handler’s electrical parts, or pooling where it grows mold. If your system has a safety float switch it may shut itself off, which is a good sign the drain is clogged. Turn the system off, soak up the standing water, and get it looked at before running it again.
How do I unclog my AC drain line myself?
You can try clearing the outdoor end of the white PVC drain line with a wet/dry vacuum — seal the vacuum hose to the pipe and run it for a couple of minutes to pull the clog out. Some homeowners also pour a cup of distilled vinegar into the drain access port to break down algae. If the vacuum doesn’t restore the flow, or the line is clogged deep in the system, it needs a technician to flush it properly and treat it so it doesn’t clog again.
How much does it cost to fix an AC that’s leaking water in Pinellas County?
It depends on the cause, but many leaks come down to an inexpensive fix like a drain-line flush or a condensate pump, often handled in a single visit. We disclose our flat-rate diagnostic fee up front on the phone, and you approve any repair cost in writing before we begin — no surprise charges once we’re on site.
Stop the leak before it becomes damage
If your AC is leaking water and the simple checks didn’t fix it, don’t wait it out — standing water around an air handler turns into mold and drywall damage fast, and a struggling system only gets worse in the heat.
Call (727) 228-2152 or use the contact form on this site for AC repair anywhere across Seminole, Largo, St. Petersburg, and the beach communities of Pinellas County. The form routes straight to dispatch and is answered within the hour during business hours. We’re family-owned, locally based, NATE-certified, and fully insured (Florida license CAC1824290), with a 5.0★ Google rating from neighbors across the Bay area.