Buck

The method depends on your local conditions. It would help if you said
where you are located. Mold starts to grow at about 80%. 75% RH is
too high. If there is a cold spot in the room, it will grow mold
because the RH will be higher there. Keep the Relative Humidity (RH)
40 to 60 %. Mold is more likely to grow on surfaces where AC blows
directly on it.

Stretch