My unit double glazed window has condensation inside, I guess the seal is gone. Any advice on the route?

Obvious answer is replaced. I wondered if it was not there some tips to avoid splashing out on a new one.

Once the seal has failed, there is no good solution other than replacing it. Try to find a replacement that is factory sealed, often come with a warranty of thirty years. A single unit together in a glass shop will not have as good security.

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