And why is this 6) Use thermostat set to auto. Setting the thermostat to the on setting may be fine in dry areas but can cause problems in humid climates.
so?

Often people who live in ocean front condos have serious mold problems that result from simple mistakes.

THE EARLY WARNING SIGNS

First condensation streams down the AC registers, or black mold such as cladosporium cladosporium or more often cladosporium spherisperium starts to grow on the AC register. In other cases white or greenish white mold spots start on clothes and leather objects in the closet. Some old timers call this harmless mildew, this is when people thought DDT, PBC, and lead paint were halmless. It is not mildew, nor is it harmless, it is a few hardy allergy causing species of aspergillus or penicillium.

Next thing you know the client returns from up north after being away 6 months only to find that the black spots & condensation on the registers is worse, and the white spots have spread to other items it specializes in growing on such as furniture, wicker items, luggage and lamp shades. The occupants find nearly invisible mold all over the place. 90% of it they never see because it is like powder.

This stuff is much harder to get rid of than stachybotrys (toxic Black mold) because stachybotrys is easier to see and stays near water, this stuff is like a light powering of dust and is almost invisible to the un trained eye, it spreads out hiding in every room of the property.

Below are a few basic tips on how to prevent this humidity related mold nightmare from occurring.

I just took it out of our mold inspection report program and revised it slightly. For inspectors a demo of the report software can be found at freemoldinspectionreporting.com

HUMIDITY CONTROL RECOMMENDATIONS

The fact that you have lots of mold of the genera Cladosporium on your AC registers indicated periodic high humidity, this tells the inspector that you sometimes have high humidity. In a seasonal ocean front property excess humidity can get way out of hand very fast and result in much or all of your property being covered in humidity loving molds.

1) Lowering the indoor humidity with a proper working AC is often the best cure, if you have humidity problems have your AC checked to see if it is working properly.

2) Have your AC person check for holes in the AC closet, even small holes of an inch or so at the AC closet walls and ceilings can allow the AC to pull humid air from inside the AC closet walls or attic.

3) A dehumidifier is often helpful as the ultimate root of the problem is usually periodic high humidity.

4) Keeps doors and windows tightly closed when not in use. Air infiltration through the sliding glass doors and windows in breezy humid ocean front areas does result if serious humidity and mold problems.
This was not occurring at the time of your inspection thus was not a problem at all. If your doors or windows ever start leaking air, repair or replace them asap. Ocean front air leaks can be detected by listening for air and feeling for air leaks with hands a few inches from the doors when the doors are closed tight and locked.

5) Use bathroom vent fan after each shower till bathroom air looks & feels free of steam and condensation.

6) Use thermostat set to auto. Setting the thermostat to the on setting may be fine in dry areas but can cause problems in humid climates.

7) Make sure a humidistat is installed and set it at 60%RH when you are away and set it to on when you are home. If someone tells you to set it at 65% do not listen to them ever, this is a old standard that caused lots of trouble.

8)Metal AC registers directed towards walls and ceilings at close range may cool these surfaces to dew point and cause condensation and mold. Redirect register louvers that are directed towards walls or ceilings.