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We have air vents in all our rooms. We haven't had the heating on yet (it is 20 degrees C in here). We are in a flat of 4; the other units don't have this problem. The window sills run with water if you touch the windows. We tried leaving top window open a bit in each room, had our check for winter done, but still no luck.

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    Hello, and welcome to Stack Exchange. Where in the world are you? Is it humid outside? Might there be a source of water inside (e.g. a shower with no vent)? – Daniel Griscom Oct 22 '16 at 11:51
  • Did you experience this previous winters, or is this your first winter in the flat? – littleturtle Oct 22 '16 at 15:29
  • Are you air drying clothing indoors? – Aloysius Defenestrate Oct 23 '16 at 0:44
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Showers without venting, a clothes dryer that is not connected to a vent or cooking can all cause the windows to sweat. When my wife is canning even our double pane windows start sweating. A dehumidifier can really help reduce the moisture in the home and Eliminate the window condensation or sweating.

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