What humidity should a room be to stop mold?

Keep Your Home Dry and Mold-Free

Nobody wants to deal with fuzzy black patches on their walls or that musty smell hiding in the corners of a bedroom. Moisture is the main culprit behind indoor mold growth, and managing the air inside your living space is the best way to keep it at bay.

To strike the right balance, aim to keep your indoor relative humidity hovering between 40% and 55%. This range isn't just comfortable for breathing; it creates a dry environment where spores struggle to take root.

When relative humidity levels regularly climb above 60%, your home enters the danger zone. At this point, invisible moisture settles against cold surfaces like windows and exterior walls, leading to condensation and giving mold the green light to grow.

You can easily track these levels using an inexpensive tool called a hygrometer. If things start getting too humid, simple habits like running extractor fans while cooking or taking showers, opening windows for a quick cross-breeze, and using a dehumidifier can make a massive difference in protecting your living space.