Cooling

Many people use thermoelectric modules, commonly called Peltier modules, to make small things colder.

(Compressor-based air conditioners and refrigerators and freezers are often more practical for cooling larger things).

• Open Source Peltier Fridge Project: [1]; [2]; [3]; [4].
• Another Peltier fridge project: "How to build your own dirt cheap fridge" ("My most important consideration is that it can be service-able by me") [5]