Leadsalad:
You are correct.. Except that's how it used to be.. I have been supplying peltier systems for several years now and we have it down to a fine art. Your comments were certainly focused on the most important or difficult aspects of peltier cooling.
We use a standard ATX power supply to power both the computer and the TEC! The PSU chosen is an Enermax which has enough current to drive both. In cases where the user wants even more power (for multiple TECs) then we have that covered too! A second ATX PSU can be used to power the TECs and is started automatically with the computer via a special cable which takes it's signal from the molex power lines of the computer. I use this device on my own computer and it's very inexpensive!
It's interesting that you didn't mention condensation.. Even at subzero it's not a problem to insulate effectively with a few layers of Neoprene and Dielectric grease.
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