Trickle Vents Stop Condensation by Controlling Humidity
The point most homeowners miss That is the real trickle vent trade-off: a tiny, controlled airflow prevents the much larger cost of damp, mold, stained reveals, and swollen timber. The vent is not there to make a room feel warm or cold. It is there to stop indoor humidity from climbing high enough to turn the coldest surface in the room into a water collector. On site visits, the same pattern shows up again and again. New double glazing, decent insulation, no obvious leaks, and yet the top corner of the bedroom window is wet every morning. The window is not failing. The room is simply holding too much moisture for too long. Once that happens, the glass does what physics says it will do: it condenses water. ...