So, I was at yoga class yesterday and it was +34 degrees outside.  Before class a few of us were talking about how hot it was.  I was red/sun burned from driving earlier in the day.  I made a comment that when I felt my skin burning I closed the window and turned on the air.  This woman next to me gasped and exclaimed, "You have AIR CONDITIONING???" 
Now, I know that it uses up a lot of energy, and there is probably something else eco-damaging about it. 
But is air conditioning really that bad?
I don't use it every day, only on the really hot days when opening windows makes the heat worse.