AC Leaking Water or Freezing Up
Your system removes several gallons of water from Houston air on a humid day. When you find it somewhere it should not be, the drain failed rather than the cooling. Ice is a different problem, and it means the opposite of what most people assume.
Call 832-662-4107
Water is normal. Water in the wrong place is not.
An air conditioner pulls moisture out of Houston air constantly — on a humid day a residential system can remove several gallons. All of that has to drain. When you find water where it should not be, the drainage failed, not the cooling.
Water around the indoor unit
Four causes, in rough order of likelihood.
| Cause | Sign |
|---|---|
| Blocked condensate drain | Pan full, water overflowing the edge. Algae and dust form a plug in the line |
| Frozen coil now thawing | Sudden large amount of water after the system stopped cooling |
| Cracked or rusted drain pan | Older systems. Water beneath but the pan looks empty |
| Disconnected drain line | Usually after other work was done nearby |
Turn the system off first. Not to protect the AC — to stop it producing more water while you work out where it is going. Ceiling damage from an attic air handler costs many times what the drain repair does.
Clearing a blocked drain yourself
Often genuinely simple. Find the access port on the drain line near the indoor unit — usually a capped T-fitting. Remove the cap, pour a cup of distilled vinegar in, leave it twenty minutes, then flush with water. A wet vacuum on the outdoor end of the line pulls stubborn plugs out.
If it blocks again within weeks, the line has a sag or a slope problem and that needs a technician rather than another cup of vinegar.
Ice on the lines or the coil
Ice means not enough warm air is crossing the coil — which is the opposite of what most people assume when they see it.
- Blocked filter is the most common cause by a distance.
- Closed or blocked vents. Closing vents in unused rooms starves the system rather than saving money.
- Failing blower motor not moving design airflow.
- Low refrigerant, which drops coil temperature below freezing.
Thaw it by turning cooling off and the fan to On for three to four hours. Change the filter meanwhile. If it freezes again within a day, the cause is the blower or refrigerant and it needs measuring.
Refrigerant leaks are different from water leaks
Refrigerant is not water and does not puddle — it escapes as gas. You will not see it. What you see instead is a system running constantly without cooling well, ice on the copper lines, and sometimes a hissing or bubbling sound.
Refrigerant is never consumed. A system does not use it up the way a car uses oil. If the charge is low, there is a leak, and it has a location. Common ones are the evaporator coil, the line set joints, and the service valves.
This matters financially now more than it used to. Since R-410A production ended in January 2025 the price per pound has risen steeply, so repeatedly topping up a leaking system has gone from wasteful to genuinely expensive. Find the leak.
When to stop and call
- Water reaching a ceiling, wall or flooring.
- The drain blocks again within a few weeks of clearing it.
- The coil refreezes within a day of thawing and a new filter.
- Any hissing or bubbling from the lines.
- A float switch that keeps cutting the system off.