Mold stays “dormant” in the air or on surfaces even when there’s no excess moisture to help it grow. … So, to answer your question, dehumidifiers do NOT kill mold, but they do prevent it by reducing humidity. If you have a mold problem in your home, don’t wait. Mold spreads as long as it has a water source.

Can mold dry out and die?

Mold will not completely die, but it will dry out. Humidity levels between 30%-60% are preferable in the prevention of mold growth. Warm air absorbs more moisture than cold air. … Some mold needs different levels of moisture.

How long does it take low humidity to kill mold?

The humidity level of the house should range from 35 to 50% to stop the mold from growing. As the dehumidifiers tend to start working slowly, they take at least a week to remove enough moisture, but reducing the humidity will only restrain the mold from spreading.