How big was your g/h and how big was the swamp cooler? My swamp cooler is 20' x 3' and when the humidity is above 50%, I can only keep the g/h around 82-85 and boy is it humid but not really cool.
Below 50% I can keep the temps in the 70's and the air is cool but not sticky humid. Lexington isn't as warm or humid as L'ville.