|Think about what you just said.|
"...the laptops heat exhaust thing (where it blows out the hot air)..."
If it's blowing out hot air, how is any hot air going to get back in?
Hot air rises. If this hot air has to move horizontally for a few inches before it can rise, it will. No matter how hard you try, you will not be able to invent this problem. Physical laws simply don't allow it.
If you don't believe me, try puking into a stiff wind.