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Hi Josh,
When the primary is chasing the ambient temperature as the outside temp is falling, if the difference is great fans will definitely help till the primary stabilises. I found by chance when completing a focus run that monitoring a defocused star under consecutive shooting allows you to see the deformation of the star without the fans on. When the variation is great between the primary temp and ambient, in my case > 1.5c, there is a slight shimmer that worsens with the greater difference. The donut deforms without the fans on. Try it next time you have a fast cool down in ambient temp relative to the primary temp. It's very noticeable. Just manually switch the fans on and off between the subs.
If you do not have primary heating, there is also the argument that if your fans draw the air in from the front and out the back, that they will draw dew in at an accelerated rate.
Regards
Steve
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