For perfect touch up, you need to use the same exact paint, apply with the same exact applicator, in the exact same weather conditions and relative humidity.

They probably didn't do it out of spite, they just stayed past their checkout time and it was really hot, if they aren't used to humidity it feels even worse, I wouldn't worry about it, you have it set to switch to away as soon as they leave if it changes after that it means they stayed past checkout which is a different problem that could possibly be addressed with a late checkout fee depending on your local laws.

If you include $300 for heat they will use $400 in oil; doors will be open for smoking, everyone will be walking around in shorts, and humidity will be bleeding from the walls.

I have also have humidity testers in the house and its not abnormally high now.

It isn't like this hot and humid weather just appeared where we live, its always hot and humid so its just interesting how this problem just appeared. 

The Midwest humidity chills to the bone.

We have a high humidity environment here and it doesn't take long to start in a vacant home.Off the top of my head that is what I can think of.Bob

I communicated this with Suncoast and they failed to do anything about it.2 - During the vacancy period the AC was not turned on however the blower was on blowing hot humid air all over the house and causing ridiculously expensive power bills.

Far enough south to be warm, farm enough north to avoid most of the severe weather (maybe less humid?).

I do like the idea of it having air conditioning, we don't have a lot of hot hot days in New York, but it gets to 80+ and humid quite often in the summer.