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There are several of us on the site that have been onto active cooling with TEC's for the last 6 years. I had an 18" SDM that I peltier cooled via a cover that went over the rocker box and had a bottom sash to keep the cool air in the box. I found that the 18" would take around 2 hours to cool to ambient (0.5 degrees C). Natural cooling with a fan is ok but you would still be exuding a lot of energy with that scope even after many hours of using the fan. The IR images seem to indicate and confirm my thoughts. My suggestion is to look at cooling techniques and if you like I can find the images of the system I made to cool my then 18".
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