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Most people never think about cooling their Raspberry Pi. They build a project around it, fire it up, and let it run.
But if you're pushing your Raspberry Pi hard, then adding some cooling is cheap insurance against problems that arise from overheating -- problems such as the CPU being throttled and the Raspberry Pi running slow, or even hardware damage.
The easiest way to cool a Raspberry Pi is to stick heatsinks on the chips to dissipate the heat generated. But if you're pushing your Raspberry Pi to the limit, then you might want to invest in a cooling case.
Don't worry, they're really cheap!
Also: My 3 must-have Raspberry Pi accessories
There are two types of cases – passively-cooled (or fanless), and fan-cooled. The fanless ones use less power, are quieter (although the fan-cooled cases I've tried are also basically silent), and don't have a fan for your finger to jam up.
I find that most of the time when I need extra cooling, a fanless case does the job just fine. But here I'm going to show how to fit a fan-cooled case. The process is almost identical except for when we're dealing with the fans.
Also: The 5 best laptop cooling pads
Here's how to fit the case.
You'll need a Raspberry Pi, the case, and all the screws. The Allen key you need for the screws is supplied with this case.
On this case, the two fans are attached to the case using four fasteners each (the fasteners with the smaller heads). Screw these down finger-tight and no more.
This kit comes with four thermal pads that are self-adhesive. Peel off the paper side and stick that to the case. Then peel off the other side, and that side will stick to the chips when the case is clamped together.
Make sure to peel both sides -- if you don't do this, the cooling won't be effective.
The first photo below shows a thermal pad before being peeled, the second shows the thermal pads fitted in place.
Align the two halves of the cooling case, and clamp it together using the remaining screws. Again, go finger-tight only. Overtightening can damage the Raspberry Pi.
This connects to pins 3 and 6 on the GPIO.
All that's left is to power up the Raspberry Pi!
If the fans aren't turning, you've likely connected the connector to the wrong pins. Switch the Raspberry Pi off, check, and restart.