Does double glazing cause condensation, or cure it? Here's the honest explanation.
Double glazing means two panes of glass with a sealed gap between them. The trapped gap slows heat and sound transfer far better than a single pane can.
Single glazing is one pane of glass. It's simpler and cheaper, and on a sheltered, quiet opening it's often perfectly adequate.
Double glazing usually *reduces* the condensation you'd get on single glazing, because the inner pane stays warmer. Condensation between the panes is a different matter — that means a failed seal, and the unit needs replacing.
It reduces it — the inner pane stays warmer, so less moisture condenses on it. Ventilation handles the rest. It's about humidity, not a window fault.
That means the sealed unit has failed and needs replacing — a different problem from surface condensation.
Usually not — surface condensation is about room humidity and temperature. Misting between the panes is the one that indicates a fault.
Related guides covering this topic from other angles — different products, applications, or contexts.
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