On 04/14/2012 07:38 PM, CozyGirrrl@aol.com wrote:

Last time I looked Peltier coolers were only good for a delta of 40*f one way or the other, can't stack and cascade them because for the hot on one side you have cool on the other.

 

You definitely wouldn't try to cool them.  You'd design them to operate at 220 or something, an then heat them just like you do with oxygen sensors.