gather a large Styrofoam box -- like the kind used as a cooler for shipping cold items -- and drill holes in the lid so that air can easily flow in and out of it. Fill the box about halfway up ...

[Joe’s] using a styrofoam cooler for the fridge with a pair of computer heat sinks and fans for the peltier plate, and a temperature PID controller he bought off eBay. The external heat sink ...