If you’ve walked past your air handler and spotted a puddle on the floor, don’t ignore it. In South Florida’s humidity, a leaking AC is one of the most common calls we get — and one of the fastest to turn into water damage if you let it sit.
Here’s exactly what causes it, what you can check yourself, and when it’s time to call a pro.
Is It Dangerous to Run an AC That’s Leaking Water?
Short answer: it depends on the cause. A small drip from a clogged drain line is annoying but won’t wreck your system immediately. A leak from a frozen evaporator coil or a cracked drain pan left running for days can cause mold, ceiling damage, and a full compressor failure.
Rule of thumb: If the leak is more than a drip, or if your AC is also blowing warm air — shut it off and call us.
The 5 Most Common Reasons Your AC Is Leaking Water
1. Clogged Condensate Drain Line
This is the #1 culprit in Boynton Beach homes. Your AC pulls humidity out of the air and channels that moisture through a drain line. In Florida’s heat and humidity, algae and mold build up inside that line fast — sometimes within a single season.
When it clogs, water has nowhere to go and overflows the drain pan.
What you can try: Find the PVC drain line near your air handler (usually a white pipe running to the exterior or to a floor drain). Pour a cup of distilled white vinegar into the access point every 3 months to prevent buildup. If it’s already blocked, a wet/dry vac on the outdoor end of the line can sometimes pull the clog loose.
When to call us: If the line is still backing up after you’ve tried clearing it, or if you can’t locate the drain access at all.
2. Frozen Evaporator Coil
Your evaporator coil sits inside the air handler and gets very cold during operation. When something restricts airflow — a dirty filter, a blocked return vent, or low refrigerant — the coil gets too cold and ice forms on it. When the system shuts off, that ice melts, and water goes everywhere.
Signs this is your issue:
- Ice visible on the coil or refrigerant lines
- Weak airflow at the vents
- The AC runs but the house isn’t cooling
What you can try: Turn the system off and let it thaw completely (this can take 1–3 hours). Then replace your air filter and check that all supply and return vents are open. Turn it back on and see if it freezes again.
When to call us: If it freezes again after a fresh filter, you likely have a refrigerant leak — that’s not a DIY fix and requires a licensed tech.
3. Cracked or Overflowing Drain Pan
There are two drain pans in most Florida AC systems: a primary one under the evaporator coil and a secondary safety pan below that. Over time — especially in systems 8–10 years or older — these pans crack or corrode.
A cracked pan won’t hold water even if the drain line is clear. The water goes straight to your floor, your ceiling (if the air handler is in the attic), or your walls.
What you can try: Visually inspect both pans with a flashlight. If you see rust, cracks, or discoloration, the pan needs replacing.
When to call us: Pan replacement is a straightforward job for a tech but awkward to DIY without pulling the air handler.
4. Dirty Air Filter (Causing Restricted Airflow)
A clogged air filter is behind more AC problems than most homeowners realize. When airflow is restricted, the evaporator coil can’t absorb heat properly, the coil temperature drops below freezing, and you end up with ice — and then a water leak when it melts.
In Boynton Beach, where systems run almost year-round, we recommend checking filters every 30 days and replacing them every 60–90 days at most.
What you can try: Pull the filter, hold it up to light. If you can’t see light through it, replace it. A new basic filter costs $5–$15 and takes two minutes to swap.
5. Low Refrigerant
Refrigerant doesn’t get used up — it circulates through a closed system. If the level is low, there’s a leak somewhere in the system. Low refrigerant causes the evaporator coil to freeze, which leads right back to the water leak problem described above.
This one you can’t fix yourself. Handling refrigerant requires an EPA 608 certification, and the underlying leak needs to be located and repaired — not just topped off.
Signs of low refrigerant:
- AC runs constantly but barely cools
- Hissing or bubbling sounds near the refrigerant lines
- Ice on the outdoor unit
Quick Checklist Before You Call
Run through these before picking up the phone — sometimes the fix takes five minutes:
- ☐ Is the air filter clean? Replace it if it’s been more than 60 days.
- ☐ Are all supply and return vents open and unblocked?
- ☐ Is the condensate drain line clear? Pour vinegar in the access port.
- ☐ Is there ice visible anywhere on the system? If yes, shut the system off.
- ☐ Is the drain pan cracked or rusting?
If you’ve checked all of the above and water is still pooling, or if your system is also blowing warm air — that’s our cue.
Stop the Leak Before It Becomes Water Damage
In Florida’s humidity, a water leak from your AC isn’t just an HVAC problem — it can turn into a mold problem within 24–48 hours. Don’t wait on it.
Cold Chillin Air Conditioning provides same-day AC repair throughout Boynton Beach, Delray Beach, Lake Worth, Boca Raton, and the rest of Palm Beach County. Licensed and insured (CAC 1823036).
Call us at 561-318-1882 or book online — we’ll get a tech out the same day.
