I will go with that, especially for laptops, given the grief you have getting to the entrails of them. On desktops I sometimes use the aircan to blast the crap into the open where I can get to it with the vacuum.............

My best buys in this area are in those "bargain stores" where you can get half a dozen artist's brushes for like $1.5? The thick pig bristle ones are great for cleaning out dust bunnies; all you have to do is use a gentle twisting motion like with a fork and spaghetti or noodles.

So long as its plugged, it won't generate anymore heat than its current state anyway.
If you mean wall socket power then I am totally with you there, and my laptop may have a dud battery anyways, but it does seem to heat up on battery power???