Where I live is by the sea so I have long thought that come rain or shine winter or summer I would have high humidity (relatively). My setup, like yours, revolved around the idea of an inside-outside cooling system.
Knowing your background and projects I shall re-visit this, while applying the above info.... it now seems more feasible.
You are very welcome, OC, and I am glad I could help. Study the Dew point a little bit, play with the slide calculator and I think you will see that it is very feasible.
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