First, measure the percentage of humidity in the room where condensation has appeared. If you have, it turns out that humidity is more than 40%, then you can rejoice, you have found the reason. The cause of high humidity can be the level of heating. That is, if it is tall, for example, in the off -season, when the heating has already been turned on, and it got warmer on the street, it causes high humidity. We advise us to use climate management.