Mold needs 3 things to grow:
Moisture (stagnant air that's not being turned over periodically will lead to enough moistur to facilitate microbial growth)
Food source (any organic material, even dust)
Temperature conducive to growth
(A 4th but less important is lack of light because molds will grow in areas with some light)

If you want to try not running the HVAC, then at a minimum run a couple of box fans...even better with a dehu piped to a drain or outside). Running the HVAC is the best option...just enough to turn the air over a few times daily.

Other environmental conditions may impact things such as insulation, vapor barriers, etc.


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