I cooled my ASI 120mc quite effectively with a peltier element, a lightweight heat sink off a server with an attached fan. Ran the fan @ 5volts and controlled the peltier with an 8 amp motor controller I bought from Deal Extreme for about $5. Crude but effective.
I dried the whole camera in a desiccant bag then sealed off the sensor cavity with the IR glass window. Even ducted (plastic tube) a wee bit of the airflow from the heat sink radiator around to the window to keep it dew\ice free. I could get it down to about 5*, 20* below ambient. I also wrapped the camera case in a neoprene sleeve for insulation. One of those beer cooler things was the right size.
See Pic
Fan underneath, that large array of fins is quite lightweight and it had a copper faceplate almost the exact size of the peltier element.
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