Just off the top of my head, with ZERO tropical experience, isn't one of the main benefits of aircon that it reduces humidity? OTOH, I live near Washington, DC, which used to be considered a "tropical duty station" by the UK Foreign Office during the summer. That was pre-aircon.
Going on the dry-is-good theory, you might think of providing a closed storage enclosure containing a desicant [and maybe a circulating fan]. Place the laptop in the enclosure when not in use. At least some desicants can be reactivated by heating in a low-temperature oven.
Or just store the laptop in the aircon space when not in use.
Leaving the computer running while in the dry area should let its internal fan run to better dry things out.
Not that I really know anything about the subject....
sc