That is is, for a cost. But from what I understand it does not work like ‘proper’ double glazing or does it? The aluminium frames conduct heat/cold unlike the insulated properties of the modern plasticised frames. Using my single glazed aluminium windows as an example they have horrifically poor ‘insulating’ properties.
Applying the second glaze might be easy on some windows, or prohibit being able to open them on others (without removing the faux doubler glaze panel). As I posted
