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You can see from the houses opposite that its a feature of the house design, so I don't know if our covenants allow a change of colour.
I mean I've seen this type of unit with PVC panels where the black glass is, but would look pretty rubbish from the outside if we replaced it with such.
Perforated timber guard might be a stop gap solution, but doesn't stop the room becoming a sauna in summer...
Yikes that’s a doozie - not sure an air gap is applicable. I guess a foil blanket layer would reflect heat back out. If you get moisture condensing on these in the winter you wouldn’t want to trap that. Realistically changing the whole unit for thermally broken double/triple glazed should be the thing - modern glass shouldn’t get that hot. The dark colour doesn’t help. What about just a perforated timber guard across in the window reveal - bit like a rad cover ? Doesn’t help with solar gain but would stop burning kids.