-When your neighbors knock on the door at all hours of the day and say, I'm sorry to bother you but my a/c is not working.
-When your daughter wakes up very surprised to see that your actully home on sunday morning
-When you leave for work it is dark, and come home it is still dark
You're inside a huge, cool, domed stadium on a hot day, and you can't stop wondering how all that space is air-conditioned.
Funny story, I live in the Phoenix area. Last year around this same time (112 degrees ). I went to see the Diamondbacks play at Chase Field. Well they had the roof closed and probably had been cooling that place off all day. We get an hour into the game and they decide to open the roof. we thought for sure all that air was about to suck right out of the stadium, but oddly enough it stayed pretty well cool for the temp outside. I was impressed.