Dry Out the Air in the Bathroom. Use an air conditioner or dehumidifier to dry out the air in the bathroom. … Install an Anti-Sweat Valve. Install an antisweat valve in the water-supply line leading to the toilet.

Why is my toilet tank covered in condensation?

The water that collects on your toilet tank is condensation – moisture that’s been pulled out of air in your bathroom. As it turns out, your toilet is a natural dehumidifier. The moisture forms on the surface of the tank because the tank water is colder than the surrounding air temperature.

Is it normal for a toilet tank to sweat?

When warm and humid weather arrives, toilet tanks can start to sweat. When the tank fills with cold water, the outside of the tank drops in temperature. The warm air comes in contact with the cold tank, and condensation forms on the outside.