A cooler's year and where leaks tend to happen
- Late spring start-up
- Supply line is reconnected and the pan refilled. Fittings that froze or loosened over winter often drip at this point.
- Early summer
- Pads and float valve get their first heavy use. A stuck float can let the pan overfill and spill onto the roof or into the duct.
- Mid summer storms
- Wind-driven rain and hail can damage the cabinet or the roof flashing around the cooler curb.
- Late summer
- Mineral scale builds up in the pan and drain. A clogged drain or bleed line can back up.
- Fall shutdown
- Water must be shut off and the line drained before the first hard freeze. A line left full can split in the attic or wall.
How cooler water ends up in the living room
A typical rooftop unit sits on a curb or platform over a duct that drops straight down into a hallway or central room. Water enters through a small supply tube, often run from a basement or utility-room pipe up through a wall or closet and across the attic. The cooler pan holds water, a pump soaks the pads, and excess water leaves through a drain or bleed-off line.
Any of those parts can leak. The pan can rust through. The float valve can stick open. The supply tube can crack where it passes through a cold attic. Flashing around the curb can fail and let rainwater in. And because the duct opening is directly over the living space, water that gets into the duct often drips straight through the ceiling grille.
Attic insulation hides early leaks well. It soaks up water, holds it against the drywall ceiling, and only shows a stain once the ceiling itself is saturated.
If you find a cooler leak
- Turn off the cooler at its switch or thermostat and shut its water supply valve, usually a small valve on a pipe in the basement or utility area.
- Put a container under the ceiling grille and move belongings away.
- If the ceiling is sagging, keep people out from under it.
- Check the attic around the duct for wet insulation, if you can do so safely.
- Photograph the ceiling, the cooler cabinet and the supply tube.
- Have the ceiling and attic read for moisture; wet insulation usually needs to come out.
Seasonal cooler care that prevents most leaks
| Task | When | Why it matters |
|---|---|---|
| Drain the pan and supply line | Before the first hard freeze | Prevents freeze splits in the attic or wall |
| Close the supply valve indoors | At fall shutdown | Stops water from reaching the line if a fitting fails |
| Cover or seal the ceiling grille | Over winter | Keeps warm, moist house air out of the cold duct |
| Inspect pan for rust and test the float | At spring start-up | Catches the two most common overflow causes |
| Check curb flashing and roof around the unit | After big storms | Rain and hail damage can leak even when the cooler is off |
General information for Lakewood, not a quote or professional advice. In an emergency, call 911.