This sort of true? There are many hours per year in many climates where direct evaporative cooling alone could suffice to keep people comfortable. However, most

This sort of true? There are many hours per year in many climates where direct evaporative cooling alone could suffice to keep people comfortable. However, most climates also have a good number of hours where air conditioning is required for comfort. You can use this tool to visualize this: https://drajmarsh.bitbucket.io/psychro-chart2d.html https://drajmarsh.bitbucket.io/psychro-chart2d.html (Use the Givoni Bioclimatic Chart overlay and select a weather station using the globe icon.) That said, there are a number of more complex devices which could further reduce how often AC systems need to be used: dew-point (Maisotsenko Cycle) coolers, indirect evaporation cooling, and thermal energy storage to name a few.