Many of us splurge on high-end 360mm AIO coolers to keep our CPU temperatures as low as possible. I do that too because they certainly help, but it’s important to remember that they’re only one part of your cooling setup. A powerful AIO or tower cooler can pull a lot of heat off your CPU, but it still relies on the air circulating inside your case. If that air is already warm and stagnant, even the best CPU coolers will struggle to keep temperatures under control.