Six windows of my house are fitted with Everest secondary units, still in
excellent condition after over 20 years. However, the wooden window frames
are now deteriorating.

Instead of replacing the whole lot with PVC double glazed units, would it be
feasible to simply replace the wooden frames with either wood or PVC single
glazed windows, retaining the inner dual glazing, hopefully without
disturbing it. This presumably would be much cheaper and also the
soundproofing is excellent due to the 100mm gap between panes.

Terry D.

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