Russell McMahon email (remove spam text)
> I'm totaly agree, peltier heating/coolers are excellent but only for
> both operation: freezing AND heating, they have a poor efficiency but they
> are the only one solution ( as I know ) for bidirectional thermostat
The Peltier device has the great advantage that it can be DRIVEN up or down
to maintain a control loop.
Most systems allow you to drive them UP but cool down passively so if you
overshoot you are at the whim of the cooling characteristics. With active
drive you can correct for variations in ambient etc.
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