How you can tell it is too damn hot
Right now, my dining room table is directly in front of my window air conditioner -- the only A/C I have, and it usually manages ok, especially when I run ceiling fans. But I noticed today that it's clearly not perfect, and my cat has discovered it as well -- I found her parked, clearly sitting right in front of the A/C, enjoying the cool air go by her.

I think if I remember, I'll try and get a picture if she does that again...though I believe it's supposed to cool down tomorrow. I hope so, I need to mow...