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Heres an idea i used many years ago!
Puchase one of the thermometers like the one below from Jaycar.
Open the unit up and utilise the alarm output line to drive a SSR or similar that turns on/off the peltier device.
Because it has a high and low alarm setting it can be designed to regulate the temp pretty well.
Could even be used to heat (for dew heater) by reversing the peltier voltage.
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