i think you prefer mobile computing. i i didnt feel like my both notebook can use for 2 hours ++ at mamak stall with 6 cells battery.

=,= my desktop never clean, yes many dust inside,,even my hair also inside. but dont have overheat issue as long i using a 12" fan blow into the casing.
i feel like dekstop no need to take care,just get a big fan. but my 2 notebook always very sayang it,, worry it will get fever and sent it to ward.

orang malas

try to put 2 rubber or eraser at the bottom of notebook. so much more space for air flow.