See above our answer for ‘how long do I need a dehumidifier for?’. For structural drying after leaks and water damage, the drying equipment should be run constantly. Drying times for wet building materils can range from days to many weeks.

For rooms with humidity issues, and for general use such as mitigating mould, we would recommend running a dehumidifier on a schedule, eg 6-12 hours per day. Keeping the humidity at 30 – 60% reflects an adequately dry atmosphere and will help reduce the likelihood of mould and other humidity damage.

The length of time to leave a dehumidifier running depends on many variables. To work out the best running time we take into consideration the following:

1. Size of the room or property;
2. Temperature of the room;
3. Dehumidifier type, size and rate of extraction;
4. Relative humidity;
5. Target humidity;
6. Cause and severity of moisture levels

When delivering and setting up your chosen equipment we’ll provide advice on how long to run your dehumididifer to achieve the best results.

• Are there health concerns after flood damage?
• Do I need heating on with a dehumidifier?