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Just a thought...how about pumping ice chilled water from a small container via a hose to a cooling coil behind the primary mirror where a fan can blow cooled air..the water temperature can be better monitored via a thermometer and ice can be added or subtracted to suit...this would help reduce the risk of dewing or guesswork...I haven't tried this system..(not yet anyway)..but I know the need for cooling not only to the mirror but the mirror cell so as to minimize contraction rate from thermal diffrences between the mirror and cell..effectivly reducing the temperature so as it would be equal to the coolest part of a particular evening..
Cheers!
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