(low humidity and lots of golfing).

Not "tons"Tenant is from Las Vegas , last time I was there in August , the humidity was very low , and it doesnt rain much there . ( isnt it the desert )  Not ideal environment for mold.

Humidity will set off a alarm.

This is in Charleston SC so humidity is around 100%.

Well, thank you for the invitation to reply ... this particular Brit is looking forward to November - 100 degrees and humid can lose its appeal very quickly.

In our higher end spec houses in southern CA where humidity was a concern we used engineered wood, which holds shape better than hardwood.

Just wanted to add,  on top of being the decent thing to do....two weeks in Florida humidity is not good for your property,  either.Once had a tenant in Houston (we rented our small house when we moved to a larger one so we could see how we liked being landlords).  

If not, a frosted, operable, vinyl window would be preferable to glass block with a small vent opening for reduction of humidity and aesthetics.  

Mold is a function of humidity not temperature fluctuation.

Out here in California (Bay Area), we have mild winters and summers and have experienced explosive economic and demographic growth such that predicting capex reserves is less significant than it is in the alternating snowy and humid Midwest.