Those are called "swamp coolers"....
Just after I built my garage a friend was throwing away a swamp cooler. I was fairly large and had spent years cooling his parents house in California. Before then I'd heard about them but never seen one up close and personal. It was uglier than sin... (Hummm... that's a project for this spring.. paint the swamp cooler!), but it was free.
I picked it up, took it home. It took a little work cutting new filter media (HD had some stuff that worked great!). The filters had deteriorated over the last 50 years. It also required repairing the pump and water-shut off.
It sits on a top shelf the garage aimed at the area I usually stand. I don't have water to the the garage, so if I want to turn it on I have to fill it up by hand. That lasts a couple of days. On a hot day the cooler will blow out nice cool air. It keeps me cool.
Since I don't have it hanging out a window, I was worried about it increasing the humidity in the garage. But, in the last 4 years, no worries... there it has not been a problem. After all this is still Washington State (by 4 miles) and wet is good.