A cold side Peltier Chip inside a computer or transmitter could keep the equipment cool.
A Peltier Wall (of chips) could cool a room.
Order a batch.
I have a "car cooler" that uses the Peltier effect. Keeps cool stuff cool, no moving parts other than a fan to cool the heat sink.
It also can keep warm stuff warm. I'm not sure if it simply switches the direction of current flow or if it has a simple heating element.
"It also can keep warm stuff warm. I'm not sure if it simply switches the direction of current flow or if it has a simple heating element."
This is exactly how those Peltier chips work. Current flow in one direction will cause one side to cool and the other to become hot. Reverse polarity, the opposite happens to each side of the chip.
Combine two or more and you double or tripple the cooling or heating, but you also double or triple both the voltage and current supply requirement, but in this way, three chips will produce a cold side that will hit below 30* F. Can most certainly keep them cold ones cold!
Or your burrito nice and warm on a cold winter day.
RFB