That brings back some memories, Mr. Bo. When I was growing up in the high desert and mountains of N.M. all we ever had was swamp coolers and they worked really well. We even had one that you would roll up in the window of the truck and the wind powered the squirrel cage and there was a tank you would fill in the a.m.. You just need to remember to leave a window or vent open at the opposite end of the house/room etc. to let the warm moist air out.
Do you remember when we had water bags hanging on the side mirror or in front of the radiator of the truck? That water was amazingly cold in 100f temps. I still have one that was never used, it just hung in the barn for 50+ yrs. One of my most prized possessions. It is proudly displayed on the bathroom door of the CTC.
McDave