How to design your PC like a "DeFreezer"
By cooling fans
When installing your case's chassis fans, take note of the intake and exhaust orientation of each fan and plan your case's airflow pattern accordingly. Don't leave fan orientation to chance--it matters greatly which direction you install fans, because you don't want them working at cross-purposes. The usual airflow scheme in a tower case is to draw cool air in from the front using an intake fan or fans, push it across the hard drives and CPU-cooler region, and send it out the back or top via exhaust fans.
A lot of PC enthusiasts opt to use both intake and exhaust fans to cool their case, and they refer to that configuration as a push-pull setup. When it comes to cooling a PC case effectively and without excessive noise, using one or more high mounted exhaust fans tends to work the best. The hot air from the components in the case will rise, and having the fans mounted in the upper-rear of the case will yield the most efficient flow of air. Most modern PC cases have front intake fans as well – the front fans are not so much for lowering the case’s internal temperature, rather they are directed to cool hard drives. Intake fans can help improve overall case cooling, however it is possible to achieve fully optimal cooling with properly placed exhaust fans. A single 120mm fan works great, or on smaller cases you can use two low noise 80mm fans such as the Panaflo fan or Enermax Enlobal fan. If you are building a rackmount server or need powerful cooling in a tight space, blower fans may be the answer.
Design your PC case Like this
Examples
I think this post will help-full to you for optimize your PC case cooling.
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