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By cooling, i assume that it would be best to leave the unit out in the open air for a 1/2 hour or more. I was taking laptop and camera out of heated 18 or 20 degrees out into say 5 or 6 degrees.
I will try again with cooling and update you.
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That's not quite white I meant by cooling, I was more referring to the "peltier- cooled" astro ccd cameras, that have a big heatsink type of thing attached to them to draw away the heat and keep the unit cool.
The hotter the unit is around the CCD, the more noise that will be generated/captured. The reason for stacking many shots is to increase the signal to noise ratio, so that noise will get cancelled out and only the good data is left.