When the source of water intrusion is known, and the spread of moisture is measurable and its known that the biological growth is spreading from the source across an affected area - what is the point of testing what is already known?

Bottom line: If you keep it under 60% its just not enough for mold to grow.You are in Sad Diego, that's a lot dryer than Milwaukee (we run a dehumidifier in most basements) so if you find more than 60% you definitely need to look where the moisture comes from!

Stachybotrys Chartarum will grow readily on the unseen paper backing of drywall, ceiling tile, paper moisture barriers, wallpaper, and other paper or wood products, especially in bath and shower areas where constant moisture is present.

There is moisture in the ground, there is moisture IN the concrete, and, depending on your preference, the pool itself may be left full (or nearly) over winter.

-Walls 2 coats of sheen of your choice-Trim 2 coats of Oil Base Enamel SemiGloss$1,750 labor only$2,300 material provided (Sherwin Williams) and touch up paint left for your property-Repairs:Material cost estimate $60-100(Labor Only)Plumbing repairs and tie in - $400Minor Carpentry - $100Wire bathroom switch - $50Repair broken window - $50-Floor Repair/Level/Floor Installation:Labor for subfloor, caulking cracks in foundation, laying moisture barrier, and installing underlayment and laminate$2,400Remove existing flooring and subfloor and rafters.Lay moisture barrier and seal house of leaking cracksInstall and level new rafters 2x10 pressure treated, and install 3/4" subfloor.Lay laminate underlayment and install laminate to match surround floor height.

I recommend being clear about what you include and what you exclude, and having multiple cleaners you can call to help with turnovers, and putting all mattresses in moisture and bug-proof mattress bags.

I did some research and found that having the fan running constantly will pick up moisture from the condensate pan and put it back in the living space, cause high humidity. 

We use Ecobee just tt simplify a few things on our STR's that I am near enough to that I stop in if something is wrong, I added moisture and temp range alarms as well as occupancy alarms to the unit, it also allows me to turn heat up or down remote.  

This will let you know if there are any plumbing leaks or any clogs in the sewer lines.2nd look at the foundation very closely, look for any stress cracks and see if any moisture coming in.3rd check out the HVAC systems.

The higher efficiciency units are not as reliable and suffer internal rot due to the higher moisture content.