It's actually quite meaningless. Yes, water vapor in the air causes mold, but here is the thing: the water only sticks to cold walls. It is the combination of

It's actually quite meaningless. Yes, water vapor in the air causes mold, but here is the thing: the water only sticks to cold walls. It is the combination of a cold wall plus water in the air that is the problem. Ventilation alone cannot make your wall warmer, in fact, excessive ventilation may cool your walls down even faster. As expensive as it might sound, the only reliable solution is to properly insulate the wall and keep it warm.