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Why You Should Trust Your Double Glazing Repairs to Local Experts Replacing double-glazed windows is not something you can do yourself, but a glass professional can make it simple and safe. It's also worth checking with the company you purchased it from to determine if it's still covered by warranty. Drilling holes into windows that are misted will release the condensation but it's only a temporary solution. Double glazing that is blown needs to be replaced to restore the thermal efficiency. Broken windo