Plastic windows and dew point. How to avoid condensation on windows

This note I decided to write in the day when the master called to Balashikha to guarantee the adjustment of windows, did not find any defects or other reasons for the call and asked the hostess - a pretty grandmother - with the question why, in fact, he was summoned. The answer put him in a dead end: the grandmother wanted to master, check whether adjusted dew point, the existence of which she told a neighbor the day before.

Dew point can not be adjusted. It is not on