Condensation is not caused by double glazing (although new windows can sometimes make condensation problems worse, by cutting out draughts). Treatment for condensation is ventilation (to vent moisture-bearing air to the outside) and heating (to raise surfaces above dew point temperature) and insulation. Hanging thick curtains in front of a window will actually keep the glass cooler and increase the condensation risk.
Open the bathroom window or use the extractor fan when showering. Keep the bathroom door closed at all times, to prevent water vapour from showers circulating around the flat. Use a cooker hood (venting directly to the outside) when cooking – every litre of gas burned produces five litres of water vapour.
Finally, every home would benefit from use of a dehumidifier. Use it on the low, “economy” setting all the time, but turn it up when a higher moisture load is introduced into the house – such as showering, cooking, or bringing damp washing into living areas.
