I agree to my fellow growmies,
iam using purolyt to prime my plants, so they get strong immune system and
no mold appear , but yu have to stay under 65 RH at least, and you may have very good ventilation / heating
depends in your conditions, look for recommended VPD
i made some runs in winter in my vault attic, and it was so hard,
then i go a biig dehumifidier, and outine fan, ventilations and a heater
most time i have to juggle what is on the heater or the dehumifidier.
this witer iam having acontrol system called " growcontrol"
my lights, the dehumifidier, the heating and the outline fan are connected,
and i can install my desired conditions- ask me next springtime
but in common iam having high humidity in summer because of the dewpoint of the vaulted cellar
( 1meter sandstone walls into the ground)