A cunning plan, a plan so cunning you could fill it with Argon and it would never freeze.
Clever to say the least. Given me a few ideas. I'll have to go see if our Bunnings has argon available, I confess I have never even looked for it previously.
I'd fill the bottom of the focusser tube on the Lunt when I am chilling the ZWO. Better than using warm air across the window.