Condensation on windows occurs when the glass is cold enough for water to condense. While upgrading to triple-glazing or raising room temperature can help, these solutions are costly and do not address the root cause. Instead, focus on managing moisture sources and improving ventilation.
The bathroom and kitchen are the main sources of moisture. Keep the bathroom door closed and use an extractor fan or open the window for at least 15 minutes after showering. In the kitchen, use a cooker hood that vents outside and open a window while cooking to reduce humidity and air pollution.
Dry laundry outdoors to prevent moisture buildup indoors. If drying inside is unavoidable, place clothes near an open window. Alternatively, use a dehumidifier in a confined space (costing about 7p per hour) or a tumble dryer. Heat pump dryers are the most efficient, costing around £51 per year, while older models cost up to £141 annually.
Wipe away condensation each morning to reduce overall moisture. Dispose of wet tissues or cloths outside or flush them down the toilet. A window vacuum (from £30) can suck water off surfaces like glass, mirrors, and tiles.
Open windows even in winter, as cold air holds less moisture. Practice 'impact ventilation' (Stosslüften) by opening all windows for five minutes twice daily to create a through draught. Trickle vents on modern windows also allow continuous airflow without leaving windows fully open.
For small spaces, use passive moisture absorbers (from £8) containing calcium chloride or silica gel. These are effective in cupboards, caravans, or small rooms. For larger areas, an electric dehumidifier (from £100) automatically maintains humidity levels and requires no installation.
