There is always moisture in the air, even if you can’t see it. Condensation occurs when warm moist air meets a cold surface. So when the air gets colder, it cannot hold the moisture which then condenses on cold surfaces such as windows, doors and even walls and could turn into black mould.
For more information then take a look at our condensation advice leaflet. Or you can seek independent advice.
If you think you have mould or condensation in your home, please contact us:
Or drop us a message on our social media channels, search for @RHAWales