Be careful with desiccants like silica gel. The advice I was given the other day came from Bintel. I thought of using silica gel to control my fungus problem. I was also advised to be careful using silica gel because of outgassing of the gel. This can coat the inside of the scope with a really fine powder that will stick to any surface.
I know this isn't help you with your problem matt but I'd rather be known as a doomsayer than see you suffer from something that is avoidable.
The air conditioning sounds like a great idea. Do you have an airconditioned room somewhere in the house? Where do you keep your scope when you are not using it?
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