Not in my experience. You'd have to get to the point of condensation to risk mold growth, and that doesn't usually occur until above 60% humidity. We aim for 45

Not in my experience. You'd have to get to the point of condensation to risk mold growth, and that doesn't usually occur until above 60% humidity. We aim for 45%, and haven't had one issue (due to the humidifier - a pinhole leak in our faucet hose was another matter -_-)