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The 12 windows in my house were uPVC double glazed about 25 years ago. The rubber surrounds have maybe lost some of their elasticity as very tiny draughts can now be detected, or maybe they are just cold air falling down the panes. Has any poster found a way to decide? There are 89 panes and thus 356 sides, any of which could be at fault and too many for smoking matches, cigarettes or smouldering string. There is a £45 electronic gimmick but I don't want to spend that much and, in any case, am not sure it will deal with this particular problem. I don't know who made the units and they were fitted by a jobbing builder, now defunct.
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Double glazing draught detector new