Swamp Cooler Leaks and Ceiling Damage

An evaporative cooler pumps water from a pan up to the top of fiber pads. A fan pulls hot outside air through the wet pads, and evaporation cools it before it blows into the house through a duct. A float valve, like the one in a toilet tank, refills the pan from a small water line as water evaporates. A bleed-off or drain line lets some water out to flush away minerals. Every part of that system can leak.

When the float sticks open, the pan overflows. When the pan rusts through, water drips out the bottom. When the water line cracks, it sprays. In each case, water lands on the roof around the cooler. If the roof seal around the cooler stand or duct opening is worn, water runs inside, soaks the insulation and shows up as a stain on the ceiling near the cooler vent or in a hallway.

A brown ring on the ceiling around or near the cooler vent, dripping from the vent itself, water stains on the roof around the cooler, rust on the outside of the cabinet and a cooler that runs out of water or never stops filling are all signs. A musty smell from the vent can mean water has been sitting in the duct.

Phoenix water is very hard. Minerals build up on the float valve, making it stick, and in the pan, speeding rust. They clog the distribution lines so water spills over the top. Keeping the bleed-off working and cleaning mineral scale each season reduces all of this.

Before turning the cooler on for the season, clean out the pan, replace the pads, check the float and adjust its level, test the pump, make sure the bleed-off line is open and look for rust holes. Check the roof around the stand. Many owners hire a cooler service for this, which also catches problems early.

Climb up or have someone check the cooler monthly. Look for overflow, drips and rust. Inside, glance at the ceiling near the vent every week or so. A small stain caught early means a small repair.

When the season ends, turn off the water to the cooler, drain the pan and line, and cover the cooler or close the inside vent so warm air does not escape in winter. Leaving water in the pan all winter speeds rust.

Turn off the cooler and its water supply. Catch drips in a bucket. If the ceiling bulges, poke a small hole over the bucket. Call a restoration company to dry the ceiling and insulation; see swamp cooler and water heater leaks. A roofer may be needed if the roof seal around the cooler failed.

Some owners replace the cooler with refrigerated air after a leak. That removes the roof water source, but the old cooler opening must be sealed properly, and AC systems have their own drain lines that need cleaning.

The duct that carries cooled air from the roof into the house can also collect water. If the cooler's pads are overfilled or the water distribution is uneven, water can spray into the duct and drip from the vent. A cooler service can adjust the flow and check the duct.

From a ladder or with binoculars, look for rust streaks on the cabinet, water stains spreading from the cooler stand and wet spots on the roof on dry days. Each points to a leak that will reach the ceiling sooner or later.

A float valve, pads and a pan cleaning cost little each season. A rusted pan or a new cooler costs more. Drying a soaked ceiling and replacing drywall and insulation can cost far more than either. Seasonal upkeep is the cheapest insurance.

Ceiling dripping under the cooler? Turn it off and call (623) 269-8054 for a local provider.

Many HVAC and handyman companies service evaporative coolers each spring and fall. Ask them to check the float, pads, pump and roof seal.

A well-kept cooler stays on the roof.

Swamp coolers leak through float valves, rusted pans and worn roof seals. Spring start-up, monthly checks and fall shut-down keep the water on the roof where it belongs.

Questions about swamp cooler leaks and ceiling damage? Call (623) 269-8054 to reach a local Maryvale provider, 24 hours a day.