If your PC is running a bit hot, you may be thinking about upgrading your case with a new AIO cooler, more fans, or a giant heat sink. And while those options will work, they can get a bit expensive. They may also take up more space in your case than you really want to lose. While you could despair at this point, there is one niche PC cooler upgrade you can snag for $20 or less that will get you the cooling boost you need without taking up extra space in your tower or setting you back a pretty penny. In fact, you can find some options for as low as $10.