Turn On The Air Conditioning To Avoid Mold
Keeping the air conditioning running in your home will not only cool your home, it will help reduce the humidey from the air and help circulate and filter the air.
Question: Should I leave the HVAC on in a vacant / empty home?
Answer: In a home left vacant with the utilities off, the resulting enclosed dark and damp environment will create an almost perfect situation for mold spores to grow.
In the summer, a closed house with the air-conditioning turned off will have higher moisture / humidity levels than an air-conditioned home. A vacant house also receives little or no sunlight through closed shades and no air movement with the fan off and the doors locked.
By leaving the air conditioning running, it will cool the home and remove moisture from the air and circulated and filtered the air.
Molds thrive when the humidity levels exceed 70 percent. Because humidity levels vary from day to day, the thermostat should have been left at or below 75 degrees, and the fan should have been set to “On.”
For more information see this link by the Environmental Protection Agency
If you are concerned about mold you should have a professional mold inspection.