On topic:I have a gaming PC with a fan inside it, but my room ALWAYS has the fan ON (the fan on the attached to the ceiling) Whether it is on the fastest speed or second fastest, (my main two that I use) it's always on when I'm at home.
Not on Topic:But for laptops, (ESPECIALLY for GUYS) you shouldn't put your laptop laying on you lap (for to long for 5 mintues its okay. It over heats and burns you legs (and does other stuff but I forgot) and if you are a guy, and it's on your lap, near that area, it over heats in the leg, thigh area... That part has nothing to do with cooling laptops though.