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Ime Venetian blinds don't block light properly. I think the sentiment is good for the summer, but to block light you need blackout blinds. If you get those ones with silver on the outside face they do a good job of reflecting heat.
Dunlem is good if you're on a budget. Remember not to try use any of their screws though, buy proper ones.
Also remember to make sure any cables are trimmed short and made safe if in a child's room as it creates a strangulation risk.
hugo7-
those ones with silver on the outside
Surprisingly I'm struggling to this, without a pretty hefty premium. Might just get a bog standard Dunelm roller and attach some reflective fabric, or actual foil to the back if it gets really hot.
Think you're probably right about the roller Vs Venetian thing though. Maybe I'll fit both!
Polygon
Blinds required for a child's bedroom now the mornings are getting brighter. South facing room though so I'm thinking ahead to another baking hot summer. Venetian could be the way forward? Not as light proof but would allow some ventilation whilst closed.