Common home freezers usually have the lowest temperatures of about -24 degrees Celsius. Freezers that go lower exist but these are much more expensive (times much). I wonder whether a common kitchen freezer (standalone without fridge) could be easily hacked to achieve lower temperatures than those -24C (like -40 or -60/-80).
I guess the task is either to hack the thermostat for lower temperature or to disable the termostat at all and supply custom thermo-regulation-circuitry (attach thermometer and then switch the whole freezer on/off as needed to regulate the temperature).
Any ideas how to do this? I guess the structure of the freezer should probably be able to withstand a bit lower temperatures that what it is designed for.