Swamp Cooler is another name for an Evaporative cooler.
I remember working on them as an EC, you had to have a mask on while draining the water out.
Legionnaires disease is rife in any Evap cooler that is not well maintained, not to mention mosquitos laying eggs in them.
There was a local McDonalds was shut down because of a problem with an Evap unit here, water was like sludge when we cleaned it out.
It was in the Kiddie castle thingee.
One other reason why I won't eat there.
Let's face it, these days if you're not young, you're old - Red Green