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AC Leaking Water Inside the House: Causes and What to Do First

Updated July 15, 20261 min read
Smell gas, smoke, or suspect carbon monoxide? Leave the building first, then call 911 or your gas utility from outside. Call us once you are safe(327) 210-5999.

Water leaking from your indoor AC unit is almost always condensate that isn't draining — most often a clogged condensate drain line, a cracked or overflowing drain pan, a disconnected drain, or a frozen evaporator coil that thawed all at once. Turn the cooling off at the thermostat first to stop more water from being produced, then mop up and look for the source. If your air handler is in the attic and you see a ceiling stain, shut the system off and call a technician before the drywall gives.

This guide covers the question above in depth for Oklahoma City homes and businesses. Here is what it walks through:

  • Do this first: shut off cooling at the thermostat
  • Why a working AC makes water on purpose
  • The common causes
  • Attic air handlers: why OKC homeowners should take this seriously
  • Water and electricity: when to stop and call
  • What you can safely do, and what you can't
  • How to keep the drain clear between visits
  • When to call a technician

What makes this guide useful: A labeled 'Where the Water Is Coming From' diagram of a typical indoor air handler — evaporator coil, primary drain pan, primary drain line, trap, secondary/emergency pan, secondary drain line, float switch, condensate pump — with each leak point numbered and matched to a table row explaining what a leak at that point looks like from the homeowner's side (e.g., 'water only at one corner of the unit,' 'water dripping from a pipe stub outside over a window,' 'ceiling stain but nothing visible at the unit'). Includes an attic-specific callout on float switches. Manufacturer pages give an undifferentiated cause list with no map of where to look.

Water showing up around your indoor unit or on the ceiling below it? Shut the cooling off and call Serrato Heat and Air at (327) 210-5999.

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