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AC Leaking Water Into the House: What to Do
Updated · Copperline editorial · 2 min read
Common causes
Causes:
- Clogged condensate line
- Cracked or rusted drain pan
- Frozen evaporator coil
- Disconnected drain line
What to do first
Turn off the AC, catch dripping water, and check the drain line.
Water damage risks
Attic air handlers can soak ceilings and insulation, which need drying or replacement.
When to call restoration
Call if ceilings sag, drywall is wet, or water has spread under flooring.
Why Tucson homes see this often
Many Tucson homes have air handlers in the attic or a hall closet, and AC runs for months at a time. Condensate lines clog with algae and dust, and pans rust through with age. Because the unit runs constantly in summer, a small leak can soak a ceiling or subfloor before anyone notices the stain.
Prevent it next season
Simple steps:
- Flush the condensate line with a cup of vinegar a few times each summer
- Ask for a float switch that shuts the system off when the pan fills
- Replace rusted secondary drain pans
- Check the ceiling below the air handler after long run times
Drying matters even in dry air
Wet insulation and drywall above a ceiling can stay damp for days, even in desert air. Moisture readings show whether materials can be dried in place or need to be removed.
Call a professional if
- Yellow or brown water rings
- Bubbling or peeling paint
- Soft, sagging drywall
- Water dripping from fixtures or vents
AC Leaking Water Into the House: What to Do: follow-up questions
Is AC leak damage covered by insurance?
Sudden leaks may be covered; long-term leaks often aren't.
Can I clear the drain myself?
Often with a wet vacuum at the outside end.
How long does drying take?
Usually a few days.
Should I keep running the AC if it's leaking?
Turn it off until the drain is cleared or a technician checks it. Running it keeps producing water that can soak ceilings.
Can an AC leak cause mold in the attic?
Yes. Wet insulation and drywall in a hot attic can grow mold quickly, so dry or replace them after the leak is fixed.
Every home differs; editorial standards.