In this video, I test out a Thermoelectric cooler on the Raspberry pi 4 and it worked out really well even when the Raspberry pi is overclocked, it’s actually the best cooler I’ve tested on the I so far. This Cooler uses the Peltier effect and is actually classified as a solid-state active heat pump, It transfers heat from one side of the device to the other using electricity. Basically when you apply power to the heatsink one side gets really hot and one side gets really cold.
The thermoelectric device I use in the video is a low power version but the cold side can still get down to 8 degrees Celsius.