It's more complicated then that. Take a look at this psychrometric chart showing the environmental bounds at which human comfort is guaranteed: http://comfort.c

It's more complicated then that. Take a look at this psychrometric chart showing the environmental bounds at which human comfort is guaranteed: http://comfort.cbe.berkeley.edu/ http://comfort.cbe.berkeley.edu/ You can see there that even at extremely dry conditions, if the operative (ambient + radiant) temperature is hot enough, it will cause heat discomfort. Even if the human starts sweating, that'll only reduce the temperature a bit so dehumidification isn't the only role of air conditions, sensible cooling is also a factor.