Is it okay to run my AC if it's leaking water?

No. Continuing to run the system creates more water, which leads to more damage. Turn the system off until the leak is diagnosed.

How do I unclog an AC condensate drain?

Locate the outdoor end of the PVC drain line and apply a wet/dry vacuum to it for 1-2 minutes. This usually pulls the clog free. If you can't access the outdoor end, call for service.

How often should the condensate drain be cleaned?

Have it cleared during your annual maintenance visit. In humid summers, pour a cup of distilled vinegar down the line at the access port every 2-3 months to prevent biofilm.

Will a leaking AC damage my house?

Yes. Persistent water leaks cause drywall damage, mold growth, and damaged subfloors. Address leaks quickly.

Why Is My AC Leaking Water? | GERARDO HVAC Fort Dodge

Water pooling under your indoor AC unit or dripping from a ceiling vent is one of the most common service calls we get across Fort Dodge, Webster City, Humboldt, and Eagle Grove in July and August. Your air conditioner is supposed to produce water — that's how it dehumidifies — but that water should drain quietly to a floor drain or outside. When it ends up on your floor or ceiling, something is blocked. Here's why it happens and what to do.

How Your AC Handles Water

When warm humid air passes over the cold evaporator coil, water condenses on the coil's fins and drips into a drain pan below. From there it flows through a 3/4-inch PVC line to a floor drain, a condensate pump, or outside. On a humid Iowa day a typical home AC can produce 5-20 gallons of water in 24 hours. When the drain path fails, that water has to go somewhere — and "somewhere" is usually your basement floor or ceiling.

Cause 1: A Clogged Condensate Drain Line

The most common cause by far. Over years of use, algae and biofilm grow inside the dark, wet PVC drain line and eventually block it completely. Water backs up in the drain pan, overflows the safety float switch (if you have one), and either shuts the system down or spills onto the floor. Clearing the line with a wet/dry vacuum or compressed air usually solves it — and adding a yearly drain treatment prevents it from recurring.

Cause 2: A Rusted or Cracked Drain Pan

Older air handlers (20+ years) often have rusted secondary drain pans. Even a small crack lets water drip down through the unit and onto the floor. Replacement pans are available for most models, but if the unit is at the end of its life, this may be a sign to plan for replacement.

Cause 3: A Frozen Coil That's Now Melting

If your coil froze up earlier in the day, then thawed when you turned the system off, all that ice melts at once and overwhelms the drain. The fix is to figure out why the coil froze in the first place — usually a dirty filter, low refrigerant, or a dirty evaporator coil.

Cause 4: A Failed Condensate Pump

If your air handler is in a basement and the drain has to go up to a sink or outside, a small electric pump moves the water. When the pump fails, water collects in its reservoir and overflows. Replacement pumps are inexpensive and easy to swap.

Cause 5: Improper Installation

If the drain line isn't pitched correctly, the drain pan isn't level, or the trap is missing or installed wrong, water won't flow properly. We sometimes find homes in newer Fort Dodge subdivisions where the original install never worked correctly — it just hadn't accumulated enough biofilm yet to fully fail.

What to Do Right Now

If you find water, turn the system OFF at the thermostat to stop more water from forming. Mop up what's there and place a bucket under any active drip. If your system has a float switch, the unit may have shut itself down — that's a good thing. Call 515-206-3232 for same-day service across Fort Dodge, Webster City, Humboldt, and Eagle Grove.

Why Is My Air Conditioner Leaking Water?